Cothornobata cyanea ( Hendel, 1913 )

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 : 215-217

5. Cothornobata cyanea ( Hendel, 1913)

( Fig. 7 )

Trepidaria cyanea Hendel, 1913: 43 . Type locality: Koshun, Taiwan. Grammicomyia cyanea (Hendel) : Enderlein, 1922: 174.

Cothornobata striatifrons Czerny, 1932: 267 (synonymized by Hennig, 1935: 306). Trepidarioides cyanea (Hendel) : Hennig, 1935: 306.

Cothornobata cyanea (Hendel) : Steyskal, 1977: 12.

Type locality:Tainan, Taiwan.

Diagnosis. Fore tibia black. Bm-cu in line with CuA2. Genital fork with basal tubercle irregular in shape, with several small tubercles, medial tubercle finger-like; inner surface of arms convergent basally, apex of arm slightly inflated.

Description. Male. Body length 8.5–9.0 mm, wing length 6.5–7.0 mm.

Head mostly subshiny blackish-brown with very thin gray pollinosity. Frontal vitta dark yellow, densely microsetulose, about 3/5 width of frons; lower orbital plate dull pollinose; ocellar triangle black; lunule yellow; face pale yellow, densely microsetulose; gena light brown, lightly pollinose; clypeus uniformly blackish-brown, shiny. Setae and setulae on head black; postgena with 1 strong seta at lower margin. Antenna pale yellow; pedicel with 1 ventral apical seta more than half length of first flagellomere; first flagellomere 1.7X as long as broad; arista nearly 3.6X length of first flagellomere, brown and bare. Proboscis brownish-yellow with brown apex, setulae brown. Palpus yellow, 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 1/5, mid and hind femora with blackish-brown apical ring; fore tibia black, mid tibia brown at base and apex, hind tibia with brown basal ring and brownish-yellow apical half; tarsi brown, except mid basitarsus dark 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 and reached to R4+5, basal to middle of penultimate section of M1. Bm-cu in line with 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. 7 C). Halter pale yellow with base brownish-yellow.

Abdomen mostly brown with pale gray pollinosity, tergites 2–5 pale yellow apically. Pleuron dark gray. Epandrium dark brown. Genital fork blackish-brown, with blackish-brown to black setulae, apex with dense, long setulae, basal and medial tubercles bearing a cluster of short black setulae; 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 ( Fig. 7 D). Distiphallus terminating in curved filaments, not inflated apically. Pregonite expanded. Postgonite narrow and apically out-turned, without an acute bend ( Fig. 7 GH).

Female. Similar to male. Tergites 1–4 dark brown, tergites 2 and 3 pale yellow apically, tergite 5, tergite 6 and oviscape blackish-brown.

Type material. Types of C. cyanea: Hendel described this species on the basis of 16 female specimens from the H. Sauter collection, collected in Koshun, Taiwan. We have not seen this material, but since there seems to be only one Cothornobata from Taiwan, the identity of this species is not in question. We have seen types of C. striatifrons (see below) and see no reason to question the accepted synonymy of C. striatifrons and C. cyanea which was supported by the good figure of the male genital fork of C. cyanea (as Trepidarioides cyanea ) by Hennig (1935: 306).

Paratypes of C. striatifrons : (1 ♂, 1 ♀, MNBG), labeled “ Paratypus ”, Cothornobata striatifrons Czerny det. Czerny, Taiwan Formosa (examined by the second author in 2002). The holotype of C. striatifrons Czerny (from Taiwan) was apparently destroyed, along with other Czerny micropezid types, when Hamburg was bombed in 1943.

Additional material examined. CHINA, Taiwan Province: Taizhong, Baxian, Mountain, 800 m, 5.vi.2011, Xiaoyan Liu (1 ♂, CAU); Nantou, Riyuetan, 800 m, 18.vi.2011, Xiaoyan Liu (1 ♂, CAU); Toa Tsuikutsu, H. Sauter, v.1914, det. Enderlein (1 ♀, ZMUC); Taiwan, Formosa, Sauter, 1910, coll Oldenberg, det. Henning (1 ♂, ZMUC).

Distribution. Oriental: China ( Taiwan).

Figures

FIGURE 7. Cothornobata cyanea (Hendel, 1913), 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. Abbreviations: arm, arm of genital fork; base, sternite 5 anterior to arm; b tub, basal tubercle; cerc, cercus; distph, distiphallus; ej apod, ejaculatory apodeme; epand, epandrium; hypd, hypandrium; m tub, medial tubercle; pgt, postgonite; phapod, phallapodeme; pregt, pregonite; sur, surstylus.