Cothornobata longifurca, Li, Xuankun, Marshall, Stephen A. & Yang, Ding, 2015

Li, Xuankun, Marshall, Stephen A. & Yang, Ding, 2015, A review of the Oriental species of Cothornobata Czerny (Diptera, Micropezidae, Eurybatinae), Zootaxa 4006 (2), pp. 201-246 : 217-219

6. Cothornobata longifurca sp. nov.

( Fig. 8 )

Diagnosis. Fore tibia yellow to brown, darker at base and apex. Bm-cu proximal to CuA2. Genital fork with basal and medial tubercles subquadrate, medial tubercle on basal 1/3 of arm; inner surface of arms parallel basally, apex of arm not inflated.

Description. Male. Body length 9.0 mm, wing length 6.0 mm.

Head mostly subshiny blackish-brown with very thin gray pollinosity. Frontal vitta brown, densely microsetulose, about 3/5 width of frons; lower orbital plate dull pollinose; ocellar triangle black; lunule dark yellow; face yellow, densely microsetulose; gena light brown, lightly pollinose; clypeus mostly blackish-brown but brown laterally, shiny. Setae and setulae on head black; postgena with 1 strong seta at lower margin. Antenna pale yellow; pedicel with 1 ventral apical seta nearly length of first flagellomere; first flagellomere 1.7X as long as broad; arista nearly 3.6X length of first flagellomere, brown except base yellow, bare. Proboscis yellow with brownish-yellow apex, setulae brown to black. Palpus yellow but brown on apical 1/2, setulae black.

Thorax blackish-brown, with pale gray pollinosity. Scutellum slightly convex, angled dorsally. Setae on thorax black, setulae blackish; katepisternum with 3 strong setae.

Legs mostly yellow, except mid and hind coxae brown, fore femur blackish-brown on apical 3/10, mid and hind femora with blackish-brown apically; fore tibia almost brown, mid and hind tibiae brown at base and apex; tarsi brown, except mid basitarsus pale yellow with brown tip.

Wing light brown with distal and discal bands brown; distal band basal to middle of distal section of M1; discal band along M1 but posterior to R4+5, basal to middle of penultimate section of M1. Bm-cu proximal to CuA2, A1+CuA2 2.4X as long as CuA2; distance between apex of R2+3 and R4+5 0.6X as long as M1 beyond dm-cu ( Fig. 8 C). Halter pale yellow with brown base.

Abdomen brown with pale gray pollinosity. Pleuron uniformly pale gray. Epandrium dark brown. Genital fork brown to dark brown, with blackish-brown to black setulae, basal and medial tubercles bearing a cluster of short black setulae; basal and medial tubercles subquadrate, medial tubercle on basal 1/3 of arm; inner surface of arms parallel basally, apex of arm not inflated ( Fig. 8 D). Distiphallus terminating in curved filaments, not inflated apically. Pregonite expanded. Postgonite narrow and apically out-turned ( Fig. 8 GH).

Female. Unknown.

Type material. HOLOTYPE: CHINA, Guangxi Province: Nanning, Daming Mountain, 29.v.2011, Tingting Zhang (♂, CAU).

Distribution. Oriental: China (Guangxi).

Remarks. Cothornobata longifurca is similar to C. cyanea ( Hendel, 1913) , but differs as follows: fore tibia yellow to brown, darker at base and apex; bm-cu proximal to CuA2; genital fork with basal and medial tubercles subquadrate, medial tubercle on basal 1/3 of arm; inner surface of arms parallel basally, apex of arm not inflated. Cothornobata cyanea has the following contrasting character states: fore tibia black; bm-cu in line with CuA2; genital fork with the basal tubercle irregular in shape with several small tubercles, medial tubercle finger-like, medial tubercle at midpoint of arm; inner surface of arms convergent basally, apex of arm slightly inflated.

Etymology. The specific name refers to the long genital fork.

Figures

FIGURE 8. Cothornobata longifurca sp. nov., male. A, left lateral; B, head; C, wing; D, genital fork; E, genitalia, left lateral; F, genitalia, posterior; G, aedeagus and associated structures, left lateral; H, aedeagus and associated structures, ventral. Scale bars = 1 mm.