Diostracus ( Diostracus ) campsicnemoides, Grichanov, I. Ya., 2015

Diostracus ( Diostracus) campsicnemoides View in CoL sp. n.

Figs 1–5 View Figs View Fig

MATERIAL. Holotype. Male , China: Yunnan, mountains between Shangri-La and Habaxue Shan, E slope, NW Bengla, 27°37’53”N, 99°57’50”E, 3570 m, fir forest, 25.V 2015, leg. G. Davidian [ ZIN]. GoogleMaps

DIAGNOSIS. According to Grichanov (2013), the new species belongs to the nominotypical subgenus Diostracus Loew, 1861 , differing from other subgenera in the presence of several dorsal setae on antennal scape. Following the key to Chinese species ( Yang et al., 2011), the new species is close to D. nishiyamai Saigusa, 1995 , which has glabrous scape, mostly black tibiae and tarsi, short cercus, etc. Following the key to Himalayan and Tibetan species ( Wang et al., 2015), the new species keys to D. ( Diostracus) tangalensis Saigusa, 1984 , which has also setose antennal scape, but differing from D. ( D.) campsicnemoides in blackish legs, short setose four leg, short fore basitarsus, and small triangular cercus.

DESCRIPTION. Male. Head ( Fig. 1 View Figs ): black, pollinose; clypeus 1/5 as wide as head, slightly wider than high; face nearly half as wide as clypeus, not wider than height of postpedicel; ocellar bristles strong, vertical and postvertical bristles about 1/2 as long as ocellar bristle; postocular ciliation black, strong, nearly as long as postvertical on upper 1/2, finer and yellowish below; ventral 1/2 of postcranium clothed with many long dirty yellow hairs, some of which as thick as vertical bristle; antenna black, with setose vase-like scape; pedicel with ring of short setae; postpedicel nearly 2 times as long as high, subtriangular, rounded distally, with short hairs, with middorsal simple arista-like stylus; basal segment of stylus thickened; length (mm) of scape to pedicel to postpedicel to stylus (1st and 2nd segments), 42/22/48/13/215; palpus ovate, 1.6 times as long as wide, 1/5 as long as eye height, slightly dilated at middle; palpus dark yellow, pollinose, bearing black hairs and one seta; proboscis moderately large, brown.

Thorax: violet-black, with washed pollinosity; mesonotum with pair of blackish longitudinal stripes; acrostichals absent; 5 pairs of dorsocentrals; 1 humeral with 1-2 short setae in front, 1 posthumeral, 2 notopleurals, 1 sutural, 1 postsutural, 1 supra-alar, 1 postalar; scutellum with 1 pair of strong scutellars; proepisternum with about 3 yellow setae on its lower portion; scutellum about 3 times wider than long; postscutellum about 3 times as long as scutellum.

Legs: rather long, mostly yellow; tibiae brown at distal apex; tarsi brown-black from apex of basitarsus; fore coxa on anterior surface clothed with short black setae, stronger and denser on distal half; fore femur ( Fig. 2 View Figs ) simple, moderately thick in basal half, with ventral row of 5-7 erect bristles, longer than diameter of femur; fore tibia slightly thickened, narrowed at apices, bearing 3-4 short dorsal bristles, anteroventral row of 7-8 strong bristles, posteroventral row of elongate hairs, denser at distal apex; fore basitarsus long, with ventral and dorsal rows of numerous setae, longer than diameter of basitarsus; 2nd to 5th tarsomeres simple, bearing simple setulae; 5th segment slightly flattened dorsoventrally; pulvilli not reduced, but small, empodium well developed and ventrally ciliated, claws small, about one third as long as 5th segment; mid coxa bearing some apical black setae; mid femur simple, with ventral row of 3-4 with short anterior

bristles at middle, longer than diameter of femur, Diostracus ) campsicnemoides sp. n. hypopygium, left lateral view.

preapical seta; mid tibia straight, with 2-3 anterodorsal bristles and few short ventral and posterior setae; mid tarsus slender, simple and short setose, with small claws, pulvilli and empodium; hind coxa bearing short black seta at apex; hind femur long and simple, with short anterior preapical bristle; hind tibia slender, bearing short setae on anterodorsal, posterodorsal and ventral surfaces; hind basitarsus with strong posteroventral seta at base; next tarsomeres slender and simple; claws, pulvilli and empodium small. Fore podomere length (from femur to tarsomere 5, mm): 1.28/1.35/0.91/0.63/0.34/0.23/0.19, mid leg: 1.65/ 2.00/1.17/0.59/0.32/0.21/0.19, hind leg: 1.98/2.49/1.03/0.60/0.36/0.25/0.21.

Wing ( Fig. 3 View Figs ): simple, almost hyaline, with simple veins; Sc developed; R 2+3 and R 4+5 weakly convex anteriorly; R 4+5 and M 1+2 almost parallel behind level of dm-cu; M 1+2 distinctly convex anteriorly; ratio of part of costa between R 2+3 and R 4+5 to this between R 4+5 and M 1+2, 50/40; ratio of cross-vein dm-cu to distal part of CuA 1, 40/31; dm-cu almost perpendicular to longitudinal wing axis; calypter yellow, with white cilia; halter yellow.

Abdomen ( Fig. 4 View Figs ): black, with washed pollinosity, with short black setae; 1st tergum with yellow hairs and ciliated with black bristles at posterior margin; 2nd tergum normal; 2nd and 3rd sterna with microscopic hairs; 3rd and 5th terga narrowed on dorsal side; 4th tergum strongly swollen, as long as 1st–3rd terga combined; 4th sternum large, subquadrate, with 2 lateral groups of short erect setae, with posterior projection; 5th tergum with 2 ventral groups of short erect setae; 5th sternum reduced to pair of small plates covered with short setae; 6th tergum small, hardly visible, shortly setose; 7th tergum reduced to semicircular arc, with some short setae; 8th segment large, with few pale hairs; hypopygium ( Figs. 4 View Figs , 5 View Fig ) black, moderately large, with mostly dark yellow appendages; hypandrium elongated and bifurcated from base, expanded distally at apex; phallus simple; epandrial lobe broad, with pointed process and setose as figured; surstylus brown, glabrous; dorsal and vental lobes of surstylus fused at base; dorsal lobe of surstylus small, oval; vental lobe of surstylus strongly enlarged, with 2 leaf-like arms; cercus yellow basally, black in distal half; cercus twice longer than epandrium, filiform, with long sparse yellow setae.

Female: unknown.

MEASUREMENTS. Body length without antennae 3.7 mm, antenna length 1.0 mm, wing length 4.7 mm, wing width 1.5 mm.

DISTRIBUTION. China ( Yunnan).

ETYMOLOGY. The species is named for his similarity with species of the genus Campsicnemus Haliday, 1851 .