Volume 119, Number 2, March andApril 2008 201 DESCRIPTIONS OF A NEW SPECIES OF OXYCERA MEIGEN AND THE MALE OF YANG AND O. LII NAGATOMI FROM SOUTHWESTERN CHINA (DIPTERA: STRATIOMYIDAE)^ ZaihuaYang,^ Maofa Yang,^ and LianmengWei* ABSTRACT: Oxyceraguizhouensis sp. nov. from GuizhouProvince andthe male ofO. HiYangand Nagatomi from Sichuan andYunnan Provinces are described. All essential diagnostic characters are figured andpossible relationships ofboth taxa are briefly discussed. KEYWORDS: Diptera, Stratiomyidae, Oxycera, new species, Oxycera Hi, China A review ofthe Chinese Oxycera species, including 13 species, was published by Yang and Nagatomi (1993). The number of the ascertained species corre- sponds with the recent world catalogue ofthe family (Woodley 2001), but this is likely to increase, e.g. at least the occurrence of some species from Japan (cf Nagatomi et al., 2001), eastern Russia (Pleske 1925, Szilady 1941) and even from the Oriental Region (Brunetti 1920, 1923, Kertesz 1923, Seguy 1934) may be expected in China. During recent study, we discovered a new species which is described here as O. guizhouensis sp. nov. Also, we discovered the male ofO. Hi Yang and Nagatomi (1993). The number ofChinese Oxycera species is now 14. SYSTEMIC ENTOMOLOGY Oxycera Hi Yang and Nagatomi, 1993 Description ofthe adult male (Figs. 1-8) Description: Male: body length 3.5 mm, wing length 3.0 mm. Head hemispherical, wholly shining black, about 1.1 times higher than long in profile and 1.4 times higher than broad in frontal view. Hairs on head pale, ocel- lar tubercle and a longitudinal line between eyes without hairs. Eyes almost bare, brown, slightly darker in lower part. In frontal view, width ofone eye as long as half distance from antenna to median ocellus and equal to width of frons just above antenna or 2/3 of face width at lowest point. Ocellar tubercle 1.5 times longer than width, upper frontal triangle in front ofmedial ocellus halfas broad as ocellar tubercle. Distance from antenna to medial ocellus twice as long as dis- Received onApril 11, 2007. Accepted on May 20, 2007. •KeyLaboratory forPlantPest Management ofMountainous Region, GuizhouProvince. Institute of Entomology, GuizhouUniversity, Guiyang 550025, P.R. China. Email: [email protected]. 'KeyLaboratory forPlantPestManagement ofMountainousRegion, GuizhouProvince. Institute of Entomology, GuizhouUniversity,Guiyang550025,P.R. China. Email: [email protected] Corresponding author. 'GuizhouAnshun Center for Disease Control and Prevention, Anshun 561000 P.R. China. Email: [email protected]. MailedonMay 14, 2008 202 ENTOMOLOGICAL NEWS tance between antenna and proboscis. Antennae (Fig. 2) yellowish brown, scape and pedicel cup-shaped, with sparse yellow hairs, flagellum black with pale pubescence, round sensory pits well visible, arista subapical. Relative length of two basal antennal segments and flagellum (without arista) as 1:1.2:3 and their relative width as 1:2:2. Arista about as long as rest offlagellum. Face black, with dense pale lateral hairs on upper part, middle hairs sparse. Underside of head with long hairs. Clypeus 1.7 times as long as width, about as wide as lowest face. Proboscis yellow, with sparse yellow pile. Thorax (Fig. 4): mostly black, with shining and pale hairs; postpronotal calli yellow; scutum with two pairs ofsmall yellow median spots, lateral spot in front ofeach wing and one pair ofyellow spots on postalar calli, anepistemum most- ly yellow. Scutellum (Fig. 3) yellow, with yellow hairs, spines slightly divergent, yellowish brown and black on tip, about 1.5 times longer than scutellum. Wing slightly yellowish brown, without vein R4, veins wanting at posterior margin. Leg yellowish brown, only hind tibia, mid and hind 3, 4 tarsomeres dark brown. Haltere stem yellowish brown to brown, knob yellow. Abdomen. Dorsum dark with yellow pattern, pale haired; tergite 1 black with a narrowly yellow anterior margin, tergites 3-4 with a larger X-shaped black spot, remains ofdorsum yellow but black apically (Fig. 5); venter wholly black. Male genitalia species-specific (Figs. 6-8): posterior margin of genital capsule convex, not bilobed, cerci relively short and broad in lateral view, gonocoxal apodemes overreaching proximal margin of genital capsule. Aedeagal complex relatively larger, trifid, all three tubes almost parallel-sided. Female described in detail by O. Hi Yang and Nagatomi, 1993. Material examined (Icfcf): IcT, Kangding (2700m), Sichuan Province, lO.VIlI. 2005; IcT, Nanping (2500m), Yunnan Province, 14.VIII. 2006; Tang Yi leg. Distribution: Yunnan, Guizhou, Sichuan. Remarks. The female holotype was collected at Huaxi, Guizhou Province and the species is thus known to occur in the three Chinese Provinces - Guizhou, Sichuan, and Yunnan. Both sexes are characterized by the unique feature among the Chinese Oxycera species, i.e. the absence ofthe vein R4 on the wing (Fig. 1). Also the shape ofthe antenna and the pattern ofthe thorax are very similar, with yellow postpronotal calli, four symmetrical yellow median spots near the trans- verse suture, lateral spotsjust in front ofsuture and yellow spots on postalar calli (Fig. 4). The scutellum is apparentlyyellow in the male and darkened in the basal half of the female, the yellow poster-upper part of the female anepistemum is distinctly extended in the male. The legs are predominantly yellow though rather yellowish brown in the male, but the broad median part ofthe female hind tibia is somewhat darker. In the female the yellow abdominal pattern consists ofthe central spot on tergite 2, two pairs ofoblique lateral markings on tergites 3 and 4, and an apical spot. All these spots are well separated in the female but the cen- tral spot and the lateral spots on tergite 3 are fused into a broad transverse band occupying all tergite 2 and large area oftergite 3 in the male (Fig. 5). The male Volume 119, Number2, March andApril 2008 203 genitalia differs from all the other known males in the target area by the shape of the posterior margin ofthe genital capsule, which is simply convex, without any medial incision (Fig. 7). Figures 1-8: Oxycera Hi, male: 1. wing; 2. antenna, inner view; 3. spine of scutellum, lateral view; 4. thorax, dorsal view; 5. abdomen, dorsal view; 6. genitalia, lateral view; 7. genital capsule and aedeagal complex, dorsal view; 8. cerci, proctiger and epandrium, dorsal view. 204 ENTOMOLOGICAL NEWS Oxycera guizhouensis sp. nov. (Figs. 9-16) Description: Male: body length 6.5 mm, wing length 5.0 mm. Head elliptical in frontal view, shining black, with pale hairs, but ocellartuber- cle and a longitudinal line between eyes without hairs. Eyes brown, with sparse but distinct hairs. Head 1.3 times higher than long in profile and twice wider than high in frontal view; width ofone eye at mid line 1 .4 times as long as distance from antenna to median ocellus in frontal view, or twice as long as width offrons just above antenna, or 1.2 times as long as face at lowest point in frontal view. Ocellar triangle 1.3 times longer than width; upper frontal triangle distinct, half as broad as ocellar triangle; distance from antenna to median ocellus 1.6 times longer than distance from antenna to proboscis. Frontal triangle and upper face with dense pale tomentum laterally. Antenna: yellowish brown to dark brown, scape and pedicel cup-shaped, with sparse brown hairs, flagellum tinged with yellowish brown. Relative length oftwo basal antennal segments and flagellum (except arista) as 1 : 1 :2 and their relative width as 1:1.8:1 .8; arista twice as long as rest of flagellum. Palpus black, distinctly one-segmented; proboscis yellow, with sparse long yellow hairs. Clypeus 1.7 times as long as wide, about width of the lowest face. Thorax (Fig. 10): wholly black, with pale hairs. Scutellum (Fig. 14) black, spines on scutellum yellowish brown but black on tip; spines as long as 2/3 of scutellum. Wing hyaline, veins brown; distance from R2+3 ^^ ^4 ^^ ^-^ times of distance from R4 to R5 Legs haired and black but apices of femora yellowish brown, both ends of tibiae yellowish brown and mid and hind 1-2 tarsomeres white with darkened apex. Haltere stem yellow brown, knob creamy green. Abdomen (Fig. 10): wholly black, with pale hairs, Male genitalia species-spe- cific (Figs. 15-16): Aedeagal complex divided, relatively short and thin. Female: body length 6.4 mm, wing length 5.4 mm. Similar to male except as follows: Head pale haired; eyes widely separated, with broader postocular rim which is wholly black. Frons with two pairs of yellow spots, the upper spots close to ocellar tubercle (Fig. 12). Width of one eye at mid line 0.8-0.9 as long as distance from antenna to median ocellus in frontal view, or 1.1 as long as frons just above antenna, or 0.7 as long as width offace at lowest point in frontal view. Ocellar triangle as long as width; width offrons above antenna from frontal view is 2.2 times longer than width ofocellar tubercle; clypeus 1.3 times longer than width, about as wide as lowest face. Thorax: Postpronotal calli with a pair of small yellow spots; spines on scutellum vestigial, only with a pair ofdark brown spots. Type Data: Holotype CT, paratype 19, Maolan (600-650m), Guizhou Pro- vince, 14. VI. 2006, Yang Zaihua leg, deposited in Institute of Entomology, Guizhou University. Etymology: The name refers to the type locality. Volume 119, Number 2, March andApril 2008 205 ^ JL.A* Jnil — B»;l^r.^,Vli '|"f-ll1I—^,^-'LM-''""^ rsSSS..,.,^W--:^Sr'S3=-!.V:»SIIW,..lui...i.;Hy.<^ ^''*'>:>-~.,.,.^^^ ^^aSBSSB -.^....^^^\^^^*f*-^^--. =saaa — '\'''''.. -•. ''"-''.'^.'.••T?A^\ Ts.SWg^Saxmi ^.: ...'*:r^"" .^"£;;:;:;;;::.;;•;;;; \\ \^^N. '^'^A^'\ ' \ \ \Ns, i1f'^VV ... '""— '-'-:: :::7 Figs. 9-16: Oxyceraguizhouensis sp. nov.; 9. wing; 10. thorax and abdomen, dorsal view; 11. antenna, innerview,cr; 12. head, frontal view,9; 13. hind leg, innerview; 14. spine of scutellum, lateral viewCT; IS.cT cerci, proctiger and epandrium, dorsal view; 16. Cf gen- italia, dorsal view. 206 ENTOMOLOGICAL NEWS Remarks: O. guizhouensis sp. nov. resembles by its predominantly black body colour and hyaline wing membrane especially O. chikuni Yang and Naga- tomi, 1993, and O. guangxiensis Yang and Nagatomi, 1993, known from China and O. kusigematiiNagatomi, 1977, described from Japan. The male ofO. chiku- ni is not known and the female differs by the elongate yellow spot at the upper part ofthe postocular rim and the colour ofthe femora being predominantly yel- low with a median darkened ring whereas the postocular rim ofthe new species is completely black and the femora are predominantly dark. The essential differ- ence ofO. guizhouensis sp. nov. from both rest species may be demonstrated by the species-specific characters of the male genitalia (Figs. 15-16): the posterior margin ofthe genital capsule is slightly convex, the gonostyli are relatively slen- der and the gonocoxal apodemes very short. The tubes of the trifid aedeagal complex are unusually slender and markedly divergent. ACKNOWLEDGEMENTS We are very grateful to Prof. RudolfRozkosny, Masaryk University (Czech Republic) and Prof. DingYang, ChinaAgriculture University, for their help in many ways. LITERATURE CITED Brunetti, E. 1920. Diptera Brachycera. Volume I. In, A. E. Shipley (Editor). The fauna ofBritish India, including Ceylon and Burma. Taylor and Francis. London, England, United Kingdom, i-x, 1-401. Brunetti, E. 1923. Second revision ofthe Oriental Stratiomyidae. Records ofthe Indian Museum 25(1): 45-180. Kertesz, K. 1923. Vorarbeiten zu einer Monographic der Notacanthen. XLV-L. Annales Historico- Naturales Musei Nationalis Hungarici 20: 85-129. Nagatomi, A., M. Sutou, and N. Tamaki. 2001. Synopsis of Japanese Oxycera (Diptera, Stra- tiomyidae). Entmological Science 4(4): 523-531. Pleske, T. 1925. Etudes sur les Stratiomyidae de la region palearctique. III. -Revue des especes palearctiques des sous-famille des Clitellariinae. Encyclopedic Entomologique, Serie B (II), Diptera 1(3-4): 105-119. Seguy, E. 1934. Dipteres de Chine de la collection de M. J. Herve-Bazin. Encyclopedic Entomo- logique, Serie B(II), Diptera 7: 1-28. Szilady, Z. 1941. Palaarktische Stratiomyiden.AnnalesHistorico-Naturales MuseiNationalis Hun- garici 34 (Pars Zoologica): 88-101. Woodley, N. M. 2001. Aworld catalog ofthe Stratiomyidae (Insecta: Diptera). Myia 11: 1-475. Yang, D. and A. Nagatomi. 1993. The Chinese Oxycera (Diptera: Stratiomyidae). South Pacific Study 13(2): 131-160.