Number 307: 1-5 ISSN 1026-051X March 2016 hppt/ urn:lsid:zoobank.org:pub: 19CAA934-11E8-4557-9FB0-803D270E0747 A NEW SPECIES OF CHRYSOTUS MEIGEN, 1824 (DIPTERA, DOLICHOPODIDAE) FROM CAUCASUS O. P. Negrobov1), S. Naglis2), O. O. Maslova3) 1) Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006, Russia. * Corresponding author, E-mail: [email protected] 2) Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, Zurich CH–8057, Switzerland. E–mail: [email protected] 3) Voronezh State Pedagogical University, Lenina 86, Voronezh 394043, Russia. Chrysotus chandleri Negrobov, Naglis et Maslova sp. n. is described from North Caucasus. The new species is similar to Ch. blepharosceles Kowarz, 1874, but differs by the color of the halters, by the lacking of long hairs on the fore tibia, and by the shape of the aedeagus. KEY WORDS: Diptera, Dolichopodidae, Chrysotus, new species, Caucasus, Russia. О. П. Негробов*, С. Наглис, О. О. Маслова. Новый вид Chrysotus Meigen, 1824 (Diptera, Dolichopodidae) с Кавказа // Дальневосточный энтомолог. 2016. N 307. С. 1-5. C Северного Кавказа описан Chrysotus chandleri Negrobov, Naglis et Maslova sp. n. Новый вид сходен с Ch. blepharosceles Kowarz, 1874, но отли- чается от последнего окраской жужжальцев, отсутствием длинных щетинок на передних голенях и формой эдеагуса. *Корреспондирующий автор, Воронежский государственный университет, Университетская пл. 1, Воронеж 394006, Россия. E-mail: [email protected] 1 INTRODUCTION The genus Chrysotus Meigen, 1824 comprises more than 335 species. The species of this genus are similar in external morphology and have a relatively small number of diagnostic characters, but most species are well distinguished by the structure of the male genitalia, particularly the structure of the aedeagus. The Palaearctic species of Chrysotus were revised by Negrobov and his co- workers in a series of publications (Negrobov, 1980; Negrobov & Maslova, 1995; Negrobov et al., 2000, 2003). Later Ch. bifurcatus Wang et Yang, 2009, Ch. brevi- cercus Wang et Yang, 2009, Ch. luoyangensis Wang et Yang, 2009, Ch. sinuolatus Wang et Yang, 2009, Ch. xinjiangensis Wang et Yang, 2009, Ch. beijingensis Wang et Yang, 2006, Ch. serratus Wang et Yang, 2006, Ch. thornpenis Liu, Wang et Yang, 2015, Ch. shanxiensis Liu, Wang et Yang, 2015, and Ch. shanxiensis Liu, Wang et Yang, 2015 were described from China (Wang & Yang, 2006, 2008, 2009; Wei & Yang, 2007; Liu et al., 2015). Five species were described from Russia, namely Ch. chukotkensis Grichanov, 2012 from Chukotka, Ch. brooksi Negrobov, Barkalov et Selivanova, 2013 from Primorskii krai, Ch. cilitibia Maslova et Negrobov, 2015 from Sakhalin and Kuril Islands, Ch. komovi Negrobov, Barkalov et Selivanova, 2014 and Ch. tricaudatus Negrobov, Barkalov et Selivanova, 2014 from Taimyr (Grichanov, 2012; Negrobov et al., 2013, 2014; Maslova & Negrobov, 2015). Naglis (2010) described Ch. dischmaensis Naglis, 2010 from Switzerland. Ch. tagoi Negrobov, Maslova et Fursov, 2015 and Ch. saigusаi Negrobov, Fursov, Kumazawa et Tago, 2015 are described from Japan (Negrobov et al., 2015). Thus, 82 species of Chrysotus are recorded from the Palaearctic Region. Negrobov et al. (2000) published the last key to males of the Palaearctic species. A key to males of the Chinese species was published by Yang et al. (2011). Up to now 13 species of Chrysotus are known from Caucasus: Ch. collini Parent, 1923 from North Caucasus (Grichanov et al., 2006), Ch. laesus (Wiedemann, 1817), Ch. angulicornis Kowarz, 1874, Ch. pennatus Lichtwardt, 1902 from Krasnodar Territory (Negrobov, 1965; Maslova et al., 2007), Ch. cilipes Meigen, 1824, Ch. cupreus Macquart, 1824, Ch. defensus Negrobov et Maslova, 2000, Ch. femoratus Zetterstedt, 1843, Ch. gramineus (Fallen, 1823), Ch. neglectus (Wiedemann, 1817), Ch. peculiariter Negrobov et Maslova, 2000, Ch. pulchellus Kowarz, 1874, and Ch. suavis Loew, 1857 from the Caucasian State Biosphere Reserve (Negrobov, 1967; Negrobov et al., 2000; Grichanov, 2007). One new species from Caucasus is described below. Holotype and paratype of the new species are deposited in the Zoological Institute of the Russian Academy of Sciences, St. Petersburg (ZIN). DESCRIPTION OF THE NEW SPECIES Chrysotus chandleri Negrobov, Naglis et Maslova, sp. n. Figs 1–4 MATERIAL. Holotype – ♂, Russia: “Mountain Dzhuga, Kuban oblast, Moy- kopskoe otdelenie” (=Krasnodar region: Tuapse district, Mt. Dzhubga), 17.VI 1911, coll. Volnuhin (ZIN). Paratype: 1 ♂, same data as holotype (ZIN). 2 DESCRIPTION. Male. Frons metallic green, with gray pollen. Face dark, with brown pollen, its width is less the distance between ocellar setae. Antennae black, postpedicel large, transversely oval. Palps brown. Legs black with black setae. Mid tibia with 2 long anterodorsal bristles. Hind tibia with long setae on the outer side. Wings no darkened. Halters dark. Fore tibia without long hairs. Head. Frons metallic green, with gray pollen. Face dark, with brown pollen, its width is less the distance between ocellar setae, its width in the middle is about twice less than the length of the postpedicel (0.2: 0.4). Antennae black, postpedicel large, transversely oval, with short hairs. Width of postpedicel longer than its length (0.9: 0.4). Stylus subapical, with short hairs, much longer than postpedicel (0.4: 2.6). Palps brown, with black hairs. Lower postoculars white. Figs. 1–7. Chrysotus spp. 1-4 – C. chandleri, sp. n.: 1 – aedeagus, lateral view, 2 – antenna, 3 – hypopygium, lateral view, 4 – aedeagus, dorsal view; 5-7 – C. blepharosceles Kowarz; 5 – hypopygium, lateral view, 6 – apical part of aedeagus, lateral view, 7 – aedeagus, dorsal view. 3 Thorax. Shining green, weakly grey pollinose; pleura grey pollinose. Mesonotum shiny green with violet shade. 6 pairs of strong dorsocentral bristles. Proepisternum with black setae. Acrostichals biseriate, well developed. Scutellum with a pair of strong medial scutellars. Legs black with black setae. Fore coxae with black setae. Fore femur with short anteroventral hairs. Fore tibia with 2 strong anterodorsal setae, its length is shorter than the diameter of the tibia. Fore tarsus without short hairs. Mid femur with few short anteroventral bristles. Mid tibia with 2 long antero- dorsal bristles. Mid tarsus without short hairs. Hind femur with long anteroventral bristles, its length is more than half the width of the femur. Hind tibia with 2 long anterodorsal and 2 posterodorsal bristles, and with long setae on the outer side which are not longer than the diameter of the tibia, and with a number of short black bristles on the ventral side. Hind tarsus with short hairs. Podomeres (from tibia to fifth tarsomere) length ratio: fore leg: 3.3: 1.7: 0.8: 0.6: 04: 0.3, mid leg 5.0: 2.0: 0.9: 0.6: 0.5: 0.4, hind leg 4.5: 1.4: 1.0: 0.7: 0.5 : 0.4. Wings. Membrane no darkened; veins dark; R and M parallel at the apex; 4+5 1+2 costal section between R and R about twice as long as the costal section 2+3 4+5 between R and M (1.9: 0.9); distal section of M longer than basal section 4+5 1+2 1+2 (5.7: 3.5); ratio of cross-vein dm-cu to distal part of CuA 0.9: 2.8; lower calypter 1 with black cilia; halter black. Abdomen. Metallic green, grey pollinose, covered with black hairs; epandrium nearly circular; surstylus narrow, curved ventrally at apex, with setae in apical part. Aedeagus without appendages. Cerci oval with fine black bristles. Female unknown. MEASUREMENTS. Body length 1.8–2.2 mm, wing length 1.9 mm. ETYMOLOGY. The new species is named after the English dipterologist Peter Chandler. COMPARISON. According to the key to the Palaearctic species of the genus Chrysotus (Negrobov et al., 2000), the new species is keyed to Ch. blepharosceles, but differs by the following characters: 1(2) Halters dark. Fore tibia without long hairs. Hypopygium – Fig. 3. Aedeagus at the apex without lateral processes (Figs 1, 4) ..…..… Chrysotus chandleri sp. n. 2(1) Halters yellow. Fore tibia with long dorsal and ventral hairs, longest hairs longer than the diameter of the tibia. Hypopygium – Fig. 5. Aedeagus at the apex with 2 lateral processes (Figs 6, 7) ………………. 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