Homoneura (Homoneura) abnormis, Gao & Yang, 2004

Gao, Caixia & Yang, Ding, 2004, A Review Of The Genus Homoneura From Guangxi, China (Diptera: Lauxaniidae), Raffles Bulletin of Zoology 52 (2), pp. 351-364 : 352

Homoneura (Homoneura) abnormis , new species

( Figs. 1-6 )

Material examined. – Holotype – male, Guangxi: Tianlin, Linaoshan (1100m), 14 Aug.2002, coll. Ding Yang ( CAU).

Paratypes – 2 males, 3 females, same data as holotype ( CAU & ZRC) .

Diagnosis. – Wing with 6 brown spots on tip of R 2+3 to M 1+2, preapical section of R 4+5, r-m and m-m; subcostal cell slightly darkened apically ( Fig. 1 ).

Description. – Body length 3.8-4.0 mm (male) or 3.9-4.6 mm (female), wing length 3.6-4.3 mm (male) or 3.9-4.3 mm (female).

Head yellow, with yellow dust. Frons about as long as wide and parallel-sided, with 2 pale brown stripes; ocellar triangle dark; oc (ocellar bristle) shorter than anterior or (orbital bristle); face without spots; cheek about 1/6 height of eye. Antenna yellow; 3rd segment 1.5 times as long as wide; arista black except yellow base, with longest hairs shorter than width of 3rd antennal segment. Proboscis yellow, pale yellow apically, with black and yellow hairs; palpus yellow, with black hairs.

Thorax yellow, with yellow dust, 0+3 dc (dorsocentral bristle), acr (acrostichal bristle) in 7 rows, prsc (prescutellar acrostichal bristle) about as long as 1st post-sutural dc. Legs yellow. Fore femur with 3 posterior ventral bristles, 4 posterior dorsal bristles, and ctenidium with 10-12 short bristles. Mid femur with 6 anterior bristles; mid tibia with 3 spurs. Wing pale yellow, dark on apex of subcostal cell, tip of R 2+3 to M 1+2, preapical section of R 4+5, r-m and m-m; costa with R 2+3, R 4+5 and M 1+2 sections in proportion of 8.5:2.6:1.6; r-m before middle of discal cell; ultimate section of M 1+2 about as long as penultimate; ultimate section of M 3+4 about 1/10 of penultimate. Halter yellow.

Abdomen yellow, with yellow dust, with dark spot at middle of tergites 3-9 and on edge of tergites 3-6 dark in male; with dark spot at middle of tergites 3-9, on two sides of sternites 5-8 and edge of tergites 3-7 dark; in female, sternites 9 also dark except sides. Male genitalia ( Figs. 2-6 ): Protandrium rather wide, forming an incompletely sclerotized band ( Fig. 3 ), and without setulae around spiracle; surstylus elongated and narrowing apically, with anterior processs short and baggy; hypandrium with apodemes large and wide, gonopod long and with long bristles; aedeagus long, pointed apically, without apical incision ( Fig. 6 ).

Etymology. – The species is named after the abnormal shape of the surstylus.

Distribution. – China (Guangxi).

Remarks. – The new species is somewhat similar to Homoneura (Homoneura) variinervis ( Kertész, 1913) from Taiwan, but can be separated from the latter by the preapical spot on R 4+5 located just above m-m. In variinervis , the preapical spot on R 4+5 is located beyond level of m-m (Sasakawa & Ikeuchi, 1982, 1985).

Figures

Figs. 1-6. Homoneura abnomis, new species, male. 1. wing. 2. epandrium and protandrium, lateral view. 3. protandrium, anterior view. 4. epandrium, posterior view. 5. aedeagal complex, lateral view, 6. aedeagal complex, ventral view.