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A NEW SPECIES OF THE GENUS DOLICHOPUS LATR. (DIPTERA: DOLICHOPODIDAE) FROM KAZAKHSTAN

Dolichopus dubrovskyi Negrobov, Maslova et Selivanova, sp. n. is described from the highland part of the Terskey-Ala-Too Range in Kazakhstan. The new species is similar to Dolichopus gorodkovi Negrobov, 1973, but differs from latter by the color of face, by the costal vein without thickening along the anterior margin, by legs chaetotaxy and by morphology of hypopygium.


INTRODUCTION
The genus Dolichopus Latreille, 1796 is one of the largest genera in the family Dolichopodidae and includes worldwide 644 described species (Grichanov, 2017). Most species of this genus are known from the Holarctic region. The last key of Palaearctic species has been published by Negrobov et al. (2005).
Eleven species of Dolichopus are known from the mountain regions of Central Asia. The species D. oxianus Stackelberg, 1930 is common in all republics of Central Asia (Kazakhstan, Kyrgyzstan, Uzbekistan, Tajikistan and Turkmenistan). Two species, D. victoris Stackelberg, 1930 andD. zimini Stackelberg, 1930, are known from Kazakhstan, Uzbekistan and Kyrgyzstan. The species D. turkestani Becker, 1917 is known from Kyrgyzstan and Uzbekistan. Three species, D. perversus Loew, 1871, D. reichardti Stackelberg, 1930 andD. skifiensis Negrobov, Selivanova et Maslova, 2013, are known from Kazakhstan and Tajikistan. Only three species have been noted from Tajikistan, namely D. medvedevi Grichanov, 2009, D. zlobini Selivanova, Negrobov et Barkalov, 2012, and D. naglisi Maslova, Selivanova et Negrobov, 2011. The species D. kumakensis Maslova, Negrobov et Selivanova, 2016 is known only from Uzbekistan. A new species is found in the mountain region of Kazakhstan and described below. DESCRIPTION. Male. Body length: 3.8 mm, wing length: 3.8 mm. Front brilliant metallic green with a purple pollinosity. Face dull brown, without metallic shine, wider than width of postpedicel, its width at the suture almost 1.5 times as long as width of postpedicel: 1.9: 1.3. Epistome thickened. Palpus and proboscis black with black setae. Antennae black. Postpedicel transverse-oval, pointed apically, shorter than width, ratio of postpedicel length to its width: 1.1: 1.3. Arista placed on apical third of postpedicel; arista slightly pubescent, its apex broken. Lower postocular bristles white.
Thorax brilliant dark-green with metallic hue. Pleuron green, with gray pollen. Propleuron below with one strong black bristle. Six pairs of dorsocentral setae. Scutellum with a pair of strong marginal setae and 2 smaller lateral setae, without hair on top.
Wing infuscated, without thickening along the anterior margin. Ratio of costal section between R 2 + 3 and R 4 + 5 to that between R 4+5 and M 1+2 : 2.2 : 1.2. Ratio of apical section of M 4 to dm-m: 3.8 : 2.8. Apical part of M 1+2 slightly bent, without stub vein. R 4+5 and M 1+2 convergent apically. Posterior edge without a notch at the apex. Anal lobe developed, anal angle straight. Halter yellow. Calypter yellow with black cilia.
Abdomen brilliant metallic-green, with gray pollen in sides, with black bristles and hairs. Cerci triangular, dirty-brown, transparent, darkened at the edges, with sickle-shaped setae on the edges, shorter than wide. Epandrial apicoventral processes yellow, oval, with pointed apex, about 3 times linger than wide. Surstylus medial lobe slightly curved and pointed apically, with 6 setae and oval fingerlike process in the middle. Surstylus lateral lobe with 2 oval ventral processes and 3 setae in the apical third.
Female unknown. HABITAT. The new species was collected in July 2017 by yellow pan traps situated in the meadow near the bank of Buzunbai River (Terskey-Ala-Too Range) at elevation 2700 m (Fig. 6).
ETYMOLOGY. The species is named after Dr. D.V. Dubrovsky, who collected the holotype of this species.
NOTES. In the key to Palaearctic species of Dolichopus (Negrobov et al., 2005), the new species runs to D. gorodkovi Negrobov, 1973 from Buryatia in Russia and to D. oxianus from Central Asia, but differs from both by following characters: