A New Species Of The Genus Dolichopus Latr. (Dolichopodidae, Diptera) From Altai Republic And Mongolia Author Negrobov, Oleg P. Author Maslova, Olga O. Author Selivanova, Olga O. text Acta Zoologica Academiae Scientiarum Hungaricae 2020 2020-05-15 66 2 163 168 http://dx.doi.org/10.17109/azh.66.2.163.2020 journal article 10.17109/AZH.66.2.163.2020 2064-2474 5BE48173-D4DB-449F-8AB6-BB54E17CA596 Dolichopus roborovskii Stackelberg, 1930 ( Figs 1–3 ) This species was described from China ( STACKELBERG 1930 ) and it is also known from Mongolia ( NEGROBOV 1974 ). Types are stored in the collection of the Zoological Institute of the Russian Academy of Sciences. A lectotype is designated in order to fix identity of the species: male, China , Eastern Tsaidam, Kurlyk, Bingol, 05.28.1895 , RobKozlov (Roborovsky, Kozlov). Paralectotypes . 5 m , 1 f, East Tsaidam, Kurlyk, Bingol, May 16–28, 1895 (Roborovsky, Kozlov), 1 m , China , Northeast Tsaidam, Gobi, Bomin (Icherin), 06. 1895 (Roborovsky, Kozlov). Dolichopus ruchini Negrobov, Maslova, Selivanova , sp. n. ( Figs 4–7 ) Description. Male. Face silvery-white, shiny, without hairs, not reaching lower edge of eyes, its width in middle part barely more than width of postpedicel ratios – 1.0:0.9. Proboscis dark brown. Palps yellow with black hairs. Frons dark green with brilliant bronze tint. Antennae black. Postpedicel bud-shaped, with oval apex, longer than wide. Arista mid-dorsal, slender throughout. The ratio of length postpedicel to its width – 1.0:0.9. Postocular setae below pale yellow. Thorax green with bronze tint. Mesonotum green, metallic and glossy with bronze tint. Pleura with gray pollen. Propleura with 1 strong black bristle below and 2 groups fine black hairs. Posterior margin of scutellum with 2 long, 2 short setae and fine hairs. Legs, including coxae, black with black setae. Fore coxae black with silver pruinosity, with white hairs, with black setae apically. Mid and hind femora with 1 strong outer preapical seta. Femora without long ventral setae, tarsus of all legs not extended. Fore tibia with long apicoventral seta, its length is approximately equal to half length of fore basitarsus, with 3 anterodorsal, 2 posterodorsal and 1 anteroventral setae. The ratio of length of fore tibia and length of segments of fore tarsus (from the 1st to the 5th) is 4.3:2.5:0.9:0.8:0.6:0.7. Mid tibia with 3 anterodorsal, 2 posterodorsal and 1 anteroventral setae. Mid basitarsus without strong dorsal seta. Ratio of length of mid tibia to length of segments of mid tarsus (from the 1st to the 5th) is 10.0:6.8:3.4:1.7:0.7:0.8. Hind tibia simple, not twisted or thickened, with a small rounded tibial organ at apex, with 4 anterodorsal, 3 posterodorsal and 1 ventral setae. Hind basitarsus with 1 long dorsal seta. The ratio of length of hind tibia to the length of segments of the hind tarsus (from the 1st to the 5th) is 7.5:3.2:2.8:1.9:1.0:1.0. Wings ( Fig. 7 ) hyaline. Costal vein with wide oval thickening on meeting point with subcosta. R 4+5 and M 1+2 parallel near wing margin. M 1+2 sharply curved in apical part, without rudimentary M 2 . Ratio of length of segment of costal vein between R 2+3 and R 4+5 and its segment between R 4+5 and M 1+2 is 4.0:2.4. Apical part M 3+4 longer than posterior transverse vein (tp) ratios – 6.3:3.5. Anal angle blunt. Lower calypter yellow with black hairs. Halter yellow. Figs 1–3. Dolichopus roborovskii Stackelberg : 1 = habitus, lateral, 2 = apex of hypopygium, lateral, 3 = hypopygium, lateral Abdomen dark green, shiny with bronze tint. Surstylus dark yellow. Apicoventral lobe of epandrium wide, its length greater than width. Cerci ( Fig. 4 ) oval, black, with serrated edges apically, their length barely greater than width. Female not known. Body length 2.4–2.5 mm , wing length 2.3–2.4 mm . Material. Holotype : male, Russia , Altai Republic , southeastern Altai , Ulandrik River , 07.12.1964 (Grunin). Deposited in the collection of the Zoological Institute of the Russian Academy of Sciences. Paratype : male, Mongolia , Chövsgöl aimak , zwischen Somon Cecerleg und Somon Bajan-ul, 65 km W von Cecerleg , 1700 m . exp. Dr. Z. Kaszab , 1968. No. 1002, 06/22/1968 . In the collection of the Hungarian Natural History Museum . Etymology. The name of the species is dedicated to the director of the Mordovia Reserve and editor of the journal “Nature Conservation Research” Alexander Borisovich Ruchin. According to the key of Palaearctic species of the genus Dolichopus (NEG­ ROBOV et al . 2005) and the key of this genus in China ( YANG 1996 , 1998 , YANG et al. 2011 ), the new species is closest to Dolichopus roborovskii Stackelberg. The following key will separate these species. Figs 4–7. Dolichopus ruchini , sp. n. : 4 = hypopygium, lateral, 5 = apex of hypopygium, lateral, 6 = medial lobe of surstylus, ventral, 7 = wing – Wing ( Fig. 1 ) with R 4+5 and M 1+2 convergent near wing margin; costal vein with stigma long and narrow; apical half of M 1+2 smoothly curved Dolichopus roborovskii Stackelberg – Wing ( Fig. 7 ) with R 4+5 and M 1+2 parallel near wing margin; costal vein with stigma wide, thick; apical half of M 1+2 sharply curved Dolichopus ruchini sp. n.