Number 318: 1-19 ISSN 1026-051X August 2016 http/urn:lsid:zoobank.org:pub:E61F8E7C-FF20-4AE8-972F-F82CCA93FA08 REVISION OF SPECIES OF THE GENUS ISMARUS HALIDAY, 1835 (HYMENOPTERA: DIAPRIOIDEA: ISMARIDAE) OF THE RUSSIAN FAUNA V. A. Kolyada1), V. G. Chemyreva2,*) 1) Borissak Paleontological Institute, Russian Academy of Sciences, Prof- soyuznaya str. 123, Moscow 117997, Russia. E-mail: [email protected] 2) Zoological Institute, Russian Academy of Sciences, Universitetskaya nab.1, St. Petersburg 199034, Russia. *Corresponding author E-mail: diapriidas.vas @gmail.com A revision of the Palaearctic species of the genus Ismarus Haliday, 1835 is provided. Diagnosis of this genus is specified and three new species, I. apicalis sp. n., I. multiporus sp. n. and I. spinalis sp. n., are described and illustrated. The new synonymy is proposed: Ismarus halidayi Förster, 1850 = Entomius longicornis Thomson, 1858, syn. n. = Ismarus mongolicus Szabo, 1974, syn. n.; Ismarus dorsiger (Haliday, 1831) = Ismarus moravicus Ogloblin, 1925, syn. n. A key to the all Palaearctic species of Ismarus is provided. Monotypic genus Szelenyioprioides Szabo, 1974 described in the family Ismaridae is synonymized under Spilomicrus Westwood, 1832 (Diapriidae: Diapriinae); its type species is transferred in Spilomicrus, and new combination is proposed here, Spilomicrus amedialis (Szabo, 1974), comb. n. KEY WORDS: Ismaridae, Ismarus, Diapriidae, Szelenyioprioides, taxonomy, new species, new synonymy, key, Palaearctic Region. 1 В. А. Коляда1), В. Г. Чемырева2). Ревизия видов рода Ismarus Haliday, 1835 (Hymenoptera: Diaprioidea: Ismaridae) фауны России // Дальневос- точный энтомолог. 2016. N 318. С. 1-19. Проведена ревизия палеарктических видов рода Ismarus Haliday, 1835. Уточнен диагноз рода и описаны 3 новых для науки вида: I. apicalis sp. n., I. multiporus sp. n. I. spinalis sp. n. Предложена новая синонимия: Ismarus halidayi Förster, 1850 = Entomius longicornis Thomson, 1858, syn. n. = Ismarus mongolicus Szabo, 1974, syn. n.; Ismarus dorsiger (Haliday, 1831) = Ismarus moravicus Ogloblin, 1925, syn. n. Приведены определительные таблицы самцов и самок всех известных палеарктических видов рода Ismarus. Описанный в семействе Ismaridae монотипичный род Szelenyioprioides Szabo, 1974 сведен в синонимы к роду Spilomicrus Westwood, 1832 (Diapriidae: Diapriinae); а его типовой вид перенесен в Spilomicrus и предложена новая комбинация Spilomicrus amedialis (Szabo, 1974), comb. n. 1) Палеонтологический Институт РАН, Профсоюзная ул. 123, Москва 199034, Россия. 2) Зоологический институт РАН, Университетская наб. 1, Санкт-Петербург 199034, Россия. INTRODUCTION Long time the genus Ismarus Haliday, 1835 was a type genus of the subfamily Ismarinae in the family Diapriidae (Nixon, 1957; Hellen, 1964; Masner, 1976; Johnson, 1992; Liu et al., 2011). However, the recent research based on molecular and morphological evidences distinctly showed polyphyletic content of the family Diapriidae and Ismaridae obtained family status (Sharkey et al., 2011). World fauna of family Ismaridae consists of two genera, Ismarus Haliday, 1835 and Szelenyioprioides Szabo, 1974, with 33 species (Johnson, 1992; Liu et al., 2011), nine of which are recorded in the Palaearctic Region (Johnson, 1992; Ventura et al., 1997; Notton, 2007). However, a revision of the genus Ismarus as well as family Ismaridae in the Palaearctic Region has never been provided before. The recent reviews of the genus Ismarus were carried out by Masner (1976) for the Nearctic Region and by Liu et al. (2011) for the fauna of China. Genus Ismarus has worldwide distribution and represents in each regions by relatively a few rare species some of them having wide distribution (Masner, 1976; Liu et al., 2011). The members of this genus are the hyperparasitoids on the Dryinidae wasps (Chambers, 1955; 1981). MATERIAL AND METHODS Material for this study was collected in many localities of Russia and several neighboring countries (Estonia, Ukraine, Georgia, Azerbaijan, Kazakhstan, and Kyrgyzstan) by yellow pan traps, Malaise traps, and by net sweeping. The available 2 type material from the several museums were studied. The list of the Museum's type material from the several museums were studied. The list of the Museum's acronyms is followed: BMNH – the National History Museum, London, U.K.; CNCI – Canadian National Collection of Insects, Ottawa, Canada; HNHM – Hungarian Nature History Museum, Budapest, Hungary; NHRS – Swedish Museum of Nature History, Stockholm, Sweden; PIN – Paleontological Institute of the Russian Academy of Sciences, Moscow, Russia; ZISP – Zoological Institute of the Russian Academy of Sciences, St Petersburg, Russia; ZMUM – Zoological Museum of the Moscow State University, Moscow, Russia. The morphological terminology and abbreviations follow Masner (1976) and the Hymenoptera Anatomy Ontology (Yoder et al., 2010). Measurements of venation are shown on the Figs 15 and 16. The following abbreviations are used in the descriptions of morphology: A1–A13 – antennal segments; OOL – the shortest distance between posterior ocellus and compound eye; POL – the shortest distance between posterior ocelli; S, T – metasomal sternites and tergites respectively. The following abbreviations for collectors are used: AP – A.G. Ponomorenko; AR – A.P. Rasnitsyn; DK – D.R. Kasparyan; MK – M.A. Kozlov; MM – M.B. Mostovskiy; SB – S.A. Belokobylskij; VK – V.A. Kolyada; VKv – V.V. Kostukov; VT – V.I Tobias; VTn – V. A. Trjapitzin. New records are marked by asterisk (*). The general distribution of species is given after Masner (1957, 1976), Kozlov (1978), Ventura et al. (1997) and Liu et al. (2011). All photographs were obtained using a Leica M165 stereomicroscope equipped with a Leica DFC450 camera. Image stacking was performed with Helicon Focus 5.0. Most part of the type material of new species is housed in the collection of ZISP, some paratypes are in the collection BMNH and PIN. TAXOMOMY Family Ismaridae Thomson, 1859 Ismarini: Thomson, 1859: 377. Ismarinae: Hellén, 1964: 4. Ismaridae: Sharkey et.al., 2011: 21. Nowadays the family Ismaridae combines only two genera, Ismarus Haliday, 1835 and Szelenyioprioides Szabo, 1974 (Johnson, 1992). The monotypic genus Szelenyioprioides Szabo, 1974 with type species S. amedialis Szabo, 1974, was described from Mongolia (Szabo, 1974). Megyaszai and Thuróczu (1998) discussed taxonomic positions of the taxa described by Szabo and observed that Szelenyioprioides belongs to Spilomicrus genera group in subfamily Diapriinae (Diapriidae). Our investigation of the holotype of Szelenyioprioides amedialis distinctly shows that Szelenyioprioides is junior synonym of Spilomicrus, therefore new synonymy and combination are proposed here: Spilomicrus Westwood, 1832 = Szelenyioprioides Szabo, 1974, syn. n.; Szelenyioprioides amedialis Szabo, 1974 = Spilomicrus amedialis (Szabo, 1974), comb. n. As the result, the family Ismaridae consists of the single genus Ismarus only. 3 Genus Ismarus Haliday, 1835 Ismarus Haliday, 1835: 467. Type species Cinetus dorsiger Haliday, 1831, by monotypy. Entomia Herrich-Schaeffer, 1840: 127. Type species Entomia campanulata Herrich- Schaeffer, 1840, by monotypy. Agonophorus Dahlbom, 1858: 289. Type species Ismarus rugulosus Förster, 1850, designated by Muesebeck (1972). DIAGNOSIS. Small to medium-sized (1.5–3.5 mm) wasps. Body colour mainly dark, brownish to black, rarely pale yellow and only with a few darker areas. Head transverse in dorsal view. Female antenna 15-segmented, male antenna 14- segmented; male A4, rarely A3 and A4 with keels; antennae inserted low on face, only slightly above clypeus; antennal shelf not developed. Palpal formula 4–3 or 5– 3. Notauli reduced to anterior pits; mesoscutal suprahumeral sulcus present as several pits to completely reduced. Scutellar pit crenulate; scutellum apically rounded or truncate. Basis of lateral subapical lobe of humeral complex of fore wing covered by tegula halfway. Petiole short, weakly elongated to transverse. Fore tibia of both sexes with single true spur and single false spur; hind tibia of female robust. Present tendency to obliteration of sutures between metasomal tergites. Cerci not inserted in depressions. REMARKS. Name Ismarus abdominalis Marshall, 1874 is noted in the Catalog of the World species of Proctotrupoidea (Johnson, 1992). However, this name is nomen nudum that was incorrectly installed by Dalla Torre (1898). Key to Ismarus species of the Palaearctic fauna Females 1. Body mainly yellow except black mesoscutum, scutellum and ocelli (Fig. 1); mandibles yellow with brown teeth. Notauli and mesoscutal suprahumeral sulcus absent (Fig. 9) .......................................................... I. dorsiger (Haliday) – Body mainly black, except pale top of metasoma (Figs 2, 5); mandibles entirely dark or dark with brown apical half. Notauli and mesoscutal suprahumeral sulcus present (Figs 8, 10, 11) ........................................................................... 2 2. Scutellum and metasoma coriaceous and mat (Fig. 5) ........ I. rugulosus Förster – Scutellum and metasoma (except T6) smooth and shine ..................................... 3 3. Mesopleuron with deep transverse striation (Fig. 2). Antenna entirely yellow; A7 to A14 elongate (Fig. 27) .............................................. I. flavicornis (Thomson) – Mesopleuron without transverse striation. Antenna at least partly dark (Figs 20, 21, 23, 24), if sometimes entirely yellow, then A7 to A14 subquadrate (Fig. 22) ………………………………………………………………………………….. 4 4. T6 entirely finely reticulate (Fig. 7). A7–A14 subquadrate (Fig. 22) …………….. …………………………………………………………………. I. spinalis sp. n. – T6 medially smooth. A7–A14 elongate (Figs 20-21, 23-24) ............................... 5 5. Mesoscutal suprahumeral sulcus with 6–7 pits (Fig. 11). Posterior half of S6 yellow (Fig. 6) ...................................................................... I. multiporus sp. n. – Mesoscutal suprahumeral sulcus with 1–2 pits (Figs 8, 10). Only margin of S6 yellow (Figs 3–4) ............................................................................................... 6 4 6. S6 more than twice longer than wide, laterally with dense pilosity (Fig. 4). A3 long, 2.6 times longer than A2 (Fig. 20) ............................... I. grandis Alekseev – S6 1.3 times longer than wide, laterally with scattered setae (Fig. 3). A3 short, 1.6 times longer than A2 (Figs 21, 23) ..................................................................... 7 7. A5 3.0 times longer than wide (Fig. 23). Marginal vein 4.0 times longer than stigmal vein (Fig. 12). Only A15 of antenna dark (Fig. 23) ....... I. apicalis sp.n. – A5 2.0 times longer than wide (Fig. 21). Marginal vein 2.5 times longer than stigmal vein (Fig. 13). Distal half of antenna dark (Fig. 21) ................ I. halidayi Förster Males 1. Tops of A3 and A4 with ventral thorns (Fig. 32); A5–A13 subquadrate (Fig. 35) . ..................................................................................................... I. spinalis sp. n. – Tops of A3 and A4 without ventral thorns (Figs 28-31, 33). A5–A13 elongate (Fig. 28) ............................................................................................................. 2 2. A3 long, 3.0 times longer than A2 (Fig. 29) .......................... I. grandis Alekseev – A3 short, 1.5–2.0 times longer than A2 (Figs 28, 30-31, 33-34) .......................... 3 3. Mandibles white. Notauli and mesoscutal suprahumeral sulcus absent (Fig. 9) ..... ............................................................................................ I. dorsiger (Haliday) – Mandibles black. Notauli and mesoscutal suprahumeral sulcus present (Figs 8, 10-11) ................................................................................................................ 4 4. Scutellum and metasoma sculptured, coriaceous-reticulate and mat (Fig. 5) ........ ............................................................................................... I. rugulosus Förster – Scutellum and metasoma (except T6) smooth and shine ...................................... 5 5. Mesopleuron with deep transverse striation (Fig. 2) ...... I. flavicornis (Thomson) – Mesopleuron without deep transverse striation .................................................... 6 6. Mesoscutal suprahumeral sulcus with 6–7 pits (Fig. 11) ....... I. multiporus sp. n. – Mesoscutal suprahumeral sulcus with 1–2 pits (Figs 8, 10) ................................. 7 7. A4 1.1 times longer than A3 (Fig. 34); A1 to A11 yellow, A12–A14 darkened (Fig. 34) ...................................................................................... I. apicalis sp. n. – A4 1.5 times longer than A3 (Fig. 31); antennae mainly dark except 2–3 basal antennomeres ........................................................................... I. halidayi Förster Ismarus apicalis Kolyada et Chemyreva, sp. nov. Figs 8, 12, 23, 34 TYPE MATERIAL. Holotype, ♀, Russia: Primorskii krai, vicinity of Spassk- Dal’niy, 1–6.VII 1995 (S. Belokobylskij) (ZISP). Paratypes. Primorskii krai: vicinity of Spassk-Dal’niy, 30.VI 1993 and 1–11.VII 1995 (SB), 3♀ (ZISP, BMNH); 35 km NE of Spassk-Dal’niy, Vasil’kovka, 13.VII 1993 (SB), 1♀ (ZISP); 20 km SE of Spassk-Dal’niy, Evseevka, 13.VII 1995 (SB), 1♀ (ZISP); 20 km SE of Spassk-Dal’niy, Siniy Ridge, 7–8.VII 2001 (SB), 1♀ (ZISP); 15 km NE of Spassk- Dal’niy, 7.VII 1993 (SB), 1♀ (ZISP); 10 km SW of Partizansk, 12.VII 1996 (SB), 1♀ (ZISP); 15 km NW of Partizansk, 28.VI 1996, 7–8.VII 1996 (SB), 2♂ (ZISP, 5 BMNH); Ussuriysk Nature Reserve, 15.VIII 1987 (VKv), 2♀ (ZISP); Barabash- Levada, 22.VI 1972 (MK), 1♀, 1♂ (ZISP); 'Kedrovaya Pad’ Nature Reserve, 5.VII 1982 (I. Kerzhner), 1♀ (PIN); 20 km SW of Putsilovka, 25–28.VI 1993 (SB), 1♀ (ZISP); Suvorovo, 9.VI 1972 (AP), 1♀ (PIN); Sakhalinskaya oblast: Kunashir Island, volcano Golovnina, 24–26.VII 1973 (DK), 1♀ (ZISP); Kunashir Island, vicinity of Sernovodsk, 23.VII 1991 (SB), 1♂ (ZISP). ETYMOLOGY. The name refers to constantly darkened apical segment of female antenna. Figs 1–7. 1 – Ismarus dorsiger, whole insect; 2 – I. flavicornis, mesosoma, lateral view; 3 – I. halidayi, metasoma, last segments, lateral view; 4 – I. grandis, metasoma, last segments, lateral view; 5 – I. rugulosus, mesosoma and metasoma, dorsal view; 6 – I. multiporus sp. n., distal part of metasoma, ventral view; 7 – I. spinalis sp. n., distal part of metasoma, dorsal view. Scale bar: 1 – 1 mm, 2-7 – 0.2 mm. 6 DIAGNOSIS. The new species is similar to Ismarus halidayi and I. spinalis sp. n. differs from I. halidayi by the characters indicated in the key (see couplet 7 for female and 8 for male), and from I. spinalis by the antennal structure and venation: male A3 and A4 without keels and ventral thorns (A3 and A4 with keels and ventral thorns (Fig. 34) in I. spinalis); A7–A13 distinctly elongate in both sex (A7–A13 quadrate to subquadrate in I. spinalis); female A15 and male A12–A14 dark brown (female antennae entirely yellow and male entirely pale brown in I. spinalis); mar- ginal vein 4.0 times longer than stigmal vein (3.0 times longer than stigmal vein in I. spinalis). DESCRIPTION. Female (holotype). Body length 3.1 mm; fore wing length 2.6 mm; antenna length 2.0 mm. Colour. Body black; legs, except hind coxae, tegulae, labrum, apical part of mandibles and antenna except apical segment yellow; apical segment of antenna reddish brown; hind coxae yellow at apex and darkened at base; veins yellowish brown; T7 reddish brown. Head. Head in dorsal view transverse (17 : 9); OOL shorter than POL (5 : 7) (Fig. 8); frons bare; face around and below toruli densely setose; clypeus evenly convex, very transverse; epistomal sulcus and tentorial pits distinct; eye bare, 3.0 times as high as malar space. A1 subcylindrical, with apical rim simple; pedicel slender basally and broad apically; ratios of length to width of all antennal segments in dorsal view: 20 : 8; 10 : 6; 16 : 5; 14 : 5; 13 : 6; 12 : 6; 10 : 7; 10 : 7; 10 : 7; 10 : 7; 10 : 7; 10 : 7; 10 : 7; 10 : 7; 16 : 7 (Fig. 23). Mesosoma. Mesosoma in dorsal view narrower than head (27 : 34); pronotum rugose-punctate and setose; small central area of lateral side of pronotum smooth; mesoscutum smooth and convex, with some scattered setae near notauli; notauli present only anteriorly, pit-shaped; mesoscutal suprahumeral sulcus absent; humeral sulcus deep and crenulate; anterior scutellar pit slightly crenulate at bottom, with low median carina; scutellum smooth, rounded, with shallow depression apically and crenulate along margin; propodeum densely rugose- punctate and pubescent, with transverse and longitudinal carinae; mesopleuron punctate and setose on ventral and lateral sides in anterior part, smooth and bare medially; mesepimeral sulcus distinct; metapleuron coarsely sculptured and covered by long setae. Fore and middle legs slender; hind tibia incrassate. Fore wing. Radial cell close, distinctly shorter than length of marginal vein (3 : 4), 3.0 times longer than its width; distant between marginal vein and beginning of basal vein shorter than length of marginal vein (11 : 16) (Fig. 12). Metasoma. Petiole transverse (12 : 9), coarsely rugose-sculptured; T2–T6 covered by scattered micropunctate and short setae; median furrow of T2 extending to 0.6 of its length; length of T3–T6 together shorter than length of T2 (3 : 4); T7 with dense micropuncture and pubescence; sutures between tergites complete and well impressed; sternites densely punctate and pubescent. VARIATION. Body length 2.1–2.9 mm. Antennae 0.65–0.95 times as long as body; female A15 entirely dark brown or darkened apically only; S6 dark brown to pale brown apically. 7 MALE. Body length 2.0–2.7 mm. Similar to female, but differs in antennal structures. Antenna 0.5–1.0 times as long as body, filiform, yellow with darkened one to four apical antennomeres; keel developed on A4 from base to 0.85–0.95 of segment length (Fig. 34); A3 = A4 or A4 distinctly longer than A3 . Ratios of length to width of antennal segments in dorsal view: 10 : 4; 5 : 3.5; 6 : 3; 8 : 3.5; 6 : 4; 6 : 4; 5 : 4; 5 : 4; 5 : 3.5; 5 : 3.5; 5 : 3.5; 5 : 3; 5 : 3; 7 : 3. HOST. Unknown. DISTRIBUTION. Far East of Russia. Figs 8–11. Head and anterior part of mesosoma, dorsal view. 8 – I. apicalis sp. n.; 9 – I. dorsiger; 10 – I. halidayi; 11 – I. multiporus sp. n. Scale bar – 0.2 mm. Ismarus dorsiger (Haliday, 1831) Figs 1, 9, 19, 25 Cinetus dorsiger Haliday, 1831: 380. Ismarus dorsiger: Liu et al,. 2011: 56. Ismarus moravicus Ogloblin, 1925: 50, syn. n. MATERIAL EXAMINED (11♀). Russia: Novgorodskaya oblast, 20 km NW of Pestovo, 4–17.VI 1998 (VT), 3♀; Kirovskaya oblast, Bolsheromanovo, 9.VIII 8 1994 (VK), 1♀; Moskovskaya oblast: Mamontovka, 19.VII 1986 (VTr), 2♀; Tish- kovo, Pushkin Distr., 20.VIII 1976 (VTr), 1♀; Malakhovka, 23.VII 1999 (MM), 1♀; Crimea: Chatyrdag Nature Reserve, 7.VIII.1971 (DK), 3♀. VARIATION. Body length 1.7–2.0 mm. Body, except scutellum and mesonotum, white to yellow; venation yellow to brown. Marginal vein 1.8–2.2 times as long as radial cell; A4 weakly longer than A3 or equal to it. DISCUSSION. The search of the type material of Ismarus moravicus Ogloblin, 1925 have been unsuccessful and here this name is proposed as synonym of I. dorsiger on the base of the original description. Ogloblin (1925) gave a detailed description of the species and compared it with I. dorsiger. He used the following diagnostic characters for diagnosis: petiole rugulose, basal cell of the hind wing absent, and the proportions of the antennal segments different. All these characters are satisfied to the range of variability in I. dorsiger: the venation of hind wing very often indistinguishable and petiole can be almost smooth to rugulose. At the same time the other important features, colour pattern, mesonotum without notauli and mesoscutal suprahumeral sulcus, are the same as in I. dorsiger. DISTRIBUTION. Irland, England, Spain, Czech Republic, *Russia (European part), China. Ismarus flavicornis (Thomson, 1858) Figs 2, 15, 27, 28 Entomius flavicornis Thomson, 1858: 379. TYPE MATERIAL. Lectotype (here designated), ♀, Sweden: “Sm” [Småland]; “Bhn” [collector C.H. Boheman]; “NHRS-HEVA 000003606”; “Ismarus flavicornis (Thomson, 1858), Chemyreva det. 2016” (NHRS). ADDITIONAL MATERIAL EXAMINED (32♀, 4♂). Estonia: 4.VI 1966 (O. Kovalev), 1♀. Ukraine: Melitopol’skaya oblast, Berdyanskoe, 24.V 1974 (DK), 1♂. Russia: Leningradskaya oblast, Murino, 12.VI 1983 (SB), 2♀; Novgorodskaya oblast, 20 km NW of Pestovo, Tychkino, 21–22.VI 1994 (VT), 1♀; Moskovskaya oblast: Rublevskiy Forest, 1–15.VI 2004 (VK), 3♀, 1♂; Narofominskiy Distr., Kamenka, 10.VI 1967 and 23.VI 1968 (AP), 15♀; Narofominskiy Distr., Ozhigovo Station, 20.V 2000 (V. Gokhman), 1♀; Pushkinskiy Distr., Tishkovo, 24.VII 1974, 11.VII 1978 and 15.VII 1979 (AR), 4♀; Vostryakovo, 9.VII 1978 (AR), 1♀; Losinyy Ostrov, 13.VI 1982 (AR), 1♀; Crimea: Bakhchisaray District, Prokhladnoe, 16.VI 1995 (VK), 1♀; Karadag Nature Reserve, 3.VI 1990 (DK), 1♂; Krasnodarskii krai, Sochi, Lazarevskoe, 20–24.V 1973 (VT), 1♀; Khabarovskii krai, Khekhtsir, 8.VI 1983 and 13.VI 1985 (DK), 2♀. VARIATION. Body length 2.3–3.0 mm. Mandibles entirely dark to pale brown in apical half; male antennae pale brown to dark brown; metasoma dark brown to black; T6 entirely smooth or weakly punctured laterally. DISTRIBUTION. Canada, USA, Irland, England, Sweden, Czech Republic, Switzerland, Austria, Finland, *Estonia, *Ukraine, *Russia (European part, Far East). 9 Ismarus grandis Alekseev, 1978 Figs 4, 14, 20, 29 Ismarus grandis Alekseev, 1978: 1104. TYPE MATERIAL. Holotype, ♀, Russia: “USSR, Primorskiy kray, [Kavalerovo District] Suvorovo, 20.VI 1972, A. Ponomorenko leg.” (ZMUM). ADDITIONAL MATERIAL EXAMINED (15♀, 16♂). Russia: Khabarovskii krai: Khekhtsir, 29.V, 11.VI and 4.VIII 1983 (DK), 1♀, 2♂; 20 km S of Bikin, Boytsovo, 25–26.V 1993 (SB), 2♂; Primorskii krai: Anisimovka, 5–9.VI 1993 and 27.VI 1996 (SB), 4♀; 30 km SE of Ussuriysk, Ussuriysk Nature Reserve, 10–11.VI 1993 (SB), 1♀, 3♂; vicinity of Ussuriysk, 24–29.VI 1981 (DK), 1♂; 15 km NWW of Partizansk, 28.VI.1996 (SB), 2♀; vicinity of Vladivostok, 27.V 1990 and 26.VI 2009 (SB), 2♀, 2♂; 20 km SW of Putsilovka, 25–28.VI 1993 (SB), 2♀; 5 km SE of Lesozovodsk, 24.VI 1993 (SB), 3♂; 30 km NE of Chuguevka, 1.VI.1993 (SB), 3♂; Sakhalinskaya oblast: Kuril Islands, Kunashir Island, Alekhino, 1.VIII 1973 (DK), 1♀; Kunashir Island, Tret‘yakovo, 30.VII 2011 (E. Tselikh & D. Rachin), 1♀. VARIATION. Body length 2.5–4.0 mm. Female A12–A15 to A9–A15 darkened. Male A1 as long as A3 or distinctly shorter; A3 as long as A4 or shorter; A1 darkened dorsally to entirely pale brown. Anterior scutellar pits crenulate at bottom to entirely smooth, with distinct to very low or indistinct median carina, 0.25–0.40 times as long as scutellum. Marginal vein as long as radial cell or weakly shorter. Median furrow of T2 extending to 0.5–0.8 of T2 length; S6 fully dark to pale apically. DISTRIBUTION. Russia (Primorskii krai, *Khabarovskii krai, *Kuril Islands). Ismarus halidayi Förster, 1850 Figs 3, 10, 13, 21, 31 Ismarus halidayi Förster, 1850: 285; Liu et al,. 2011: 57. Entomia companulatus Herrich-Schӓffer, 1840: 127 (nomen oblitum). Entomius longicornis Thomson, 1858: 378, syn. n. Ismarus mongolicus Szabo, 1974: 353, syn. n. TYPE MATERIAL. Lectotype of Ismarus longicornis (here designated), ♀, Sweden: “Sbg” [Sövdeborg]; “Rh” [collector Carl David Emmanuel Roth]; “NHRS-HEVA 000003605”; “Ismarus longicornis (Thomson, 1858), Chemyreva det. 2016” (NHRS). Holotype of Ismarus mongolicus, ♀, “Mongolia: Central aimak Tosgoni ovoo, 5–10 km N von Ulan-Baator, 1500–1700 m. Exp. Dr. Z. Kaszab, 1967”; ”Ismarus mongolicus Szabo, 1974”. ADDITIONAL MATERIAL EXAMINED (46♀, 17♂). Russia: Leningrad- skaya oblast, St Petersburg, Levashovo, 6.VII 1975 (V.Kv), 1♀; Yaroslavskaya oblast, Yaroslavl’, 7.V 1899 (Kokujev), 1♀, 3♂; Moskovskaya oblast, Moscow, Bitsevo Park, 11.VII 1994 (VK), 1♀; Moscow, Losinyy Ostrov, 27.VI 1978 and 23.V 1982 (AR), 2♀, 1♂; same locality, 14.V 1996, (MM), 1♀; Rublevka Forest, 1–15.VI 2004 (VK), 3♂; Samarskaya oblast, Zhiguli Nature Reserve, 17–18.VI 2011 10