Homoneura (Homoneura) cornis, Li & Yang, 2012

Li, Wenliang & Yang, Ding, 2012, Eleven new species of the Homoneura (Homoneura) beckeri group from Yunnan, China (Diptera, Lauxaniidae), Zootaxa 3537, pp. 1-28 : 13-14

Homoneura (Homoneura) cornis sp. nov.

(Figs, 4, 15, 26, 37, 57–61)

Diagnosis. Face with a large brown median spot. Antenna blackish brown. Wing without markings. Abdominal tergites 1–5 entirely blackish brown; tergite 6 sometimes yellow laterally. Aedeagus inversely ox horn-like at apex.

Description. MALE. Body length 4.0– 4.3 mm, wing length 4.2–4.6 mm. FEMALE. Body length 4.2–4.4 mm, wing length 4.4–4.6mm.

Head ( Fig. 4) pale yellow. Face with a large brown median spot. Frons about as long as wide and parallel–sided, with two narrow blackish gray stripes along or rows and a narrow brown triangular median stripe extending to ocellar triangle; ocellar triangle grayish black; oc strong, about as long as anterior or, anterior or slightly shorter than posterior or. Gena about 1/7 height of eye. Occiput with a wide grayish black stripe confluent with ocellar triangle, upper half of occiput usually with a large brown spot on each side, not extending to top margin of eye. Antenna blackish brown, 1st flagellomere 1.7 times longer than high; arista long plumose, black except brownish basally, with longest hairs longer than height of 1st flagellomere. Proboscis yellowish brown, with yellowish and blackish hairs; palpus pale yellow with blackish hairs.

Thorax ( Fig. 15) blackish brown with grayish white pruinescence. Mesoscutum with 0+3 dc (anterior dc clearly behind transverse scutal suture), acr in 8 somewhat irregular rows; prsc shorter than 1st post–sutural dc. Anepisternum and pteropleuron blackish brown with whitish gray pruinescence, and anepisternum with yellow dorsal margin, katepisternum pale yellow except blackish brown anterior dorsal corner. Scutellum brownish black except yellow apical margin, with yellowish gray pruinescence. Legs pale yellow; hind tibia with an incomplete brown basal ring. Fore femur with 4 strong pv and 5 pd, ctenidium with 11–13 short bristles; fore tibia with 1 long preapical ad and 2 short apv. Mid femur with 6 a and 1 apv; mid tibia with 1 strong preapical ad and 3 strong apv. Hind femur with 1 preapical ad; hind tibia with 1 weak preapical ad and 1 short apv. Wing ( Fig. 26) slightly yellow, without markings; subcostal cell hyaline; costa with 2nd (between R 1 and R 2+3), 3rd (between R 2+3 and R 4+5) and 4th (between R 4+5 and M 1) sections in proportion of 2.4: 0.7: 0.4; r-m at middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 1.9: 1; ultimate section of CuA 1 about 1/5 of penultimate. Halter pale yellow.

Abdomen ( Fig. 37) yellow with sparse silvery white pruinescence; tergites 1–5 entirely blackish brown; tergite 6 yellow with a brown triangular median spot. Male genitalia ( Figs. 57–61): protandrium circular; epandrium nearly trapezoidal in lateral view, surstylus broad, curved, digitiform in lateral view and unciform in posterior view; hypandrium with a pair of short broad ventral processes, hypandrial apodeme long; gonopod columniform; aedeagus apically ox horn-like, with distinct apical incision, consisting of a pair of dorsal sclerites, and with a pair of lateral median teeth.

Type material. Holotype ♂ ( CAU), CHINA, Yunnan Province: Baoshan, Baihualing, Wenquan , 23. V. 2006, Xingyue Liu . Paratypes: CHINA, Yunnan Province: 1 ♂, 1 ♀ ( CAU), Baoshan, Baihualing, Wenquan, 23. V. 2006, Xingyue Liu ; 1 ♂, 1 ♀ ( CAU), Baoshan, Baihualing, Wenquan, 29. V. 2006, Xingyue Liu ; 1 ♀ ( CAU), Baoshan, Baihualing, Wenquan, 23. V. 2006, Yajun Zhu ; 1 ♀ ( CAU), Baoshan, Baihualing, Jiujiezi, 24. V. 2006, Yajun Zhu .

Distribution. China (Yunnan).

Remarks. The new species is somewhat similar to Homoneura (Homoneura) bomiensis Gao & Yang from China (Tibet) in the following characters: face with a large brown median spot; antenna blackish brown; abdominal tergites 1–5 entirely blackish brown; aedeagus with distinct apical incision. But it can be separated from the latter by the following features: wing without stripes on dm-cu; aedeagus inversely ox horn-like at apex, and with a pair of lateral median teeth. In H. (H.) bomiensis , the wing has a brown stripe on dm-cu; the aedeagus is not inversely ox horn-like at apex, and has no lateral median teeth ( Gao & Yang 2003).

Etymology. Latin, cornis , meaning inverse ox horn, referring to the aedeagus being oxhorn-like apically.