Nine new species from China of the subgenera Chaetohomoneura and Neohomoneura in the genus Homoneura (Diptera, Lauxaniidae) Author Shi, Li Author Wang, Jun Chao Author Yang, Ding text Zootaxa 2011 2975 1 28 journal article 10.5281/zenodo.205067 27464b15-1e11-4fb3-8a44-e6fcc115f4c5 1175-5326 205067 Homoneura ( Neohomoneura ) biconcava sp. nov. ( Figs. 19 , 34–38 ) Diagnosis. Wing with basal extremity of brown subapical spot on R4+5 before vertical level of spots on R2+3 and M1, slightly connected with brown spot on dm-cu ; a brown cloud on dm-cu , constricted at middle. Abdomen yellow, tergites 2–6 each with black posterior margin, tergites 4–6 each with a brown triangular median spot confluent with black posterior margin. Description. MALE. Body length 6.1 mm , wing length 5.8 mm . Head yellow. Frons about as long as wide and parallel–sided, with 2 pale brown stripes extending to ocellar triangle; ocellar triangle pale brown with short setulae behind oc ; oc developed, about as long as anterior or ; gena about 1/5 height of eye. Antenna yellow, 1st flagellomere 1.7 times as long as high; arista dark except brownish base, with longest setula slightly longer than height of 1st flagellomere. Proboscis yellow, with yellowish and blackish setulae; palpus yellow, with blackish setulae. Thorax brownish yellow. Mesonotum with 0+3 dc , acr in 8 somewhat irregular rows, uniformly short setula– like; prsc longer than anteriormost dc ; 1 strong sa with a long and thin setula (shorter than 1/2 length of sa ) behind sa . Legs yellow except tarsomeres 3–5 pale brown. Fore femur with 5 strong pv , 8 pd , and ctenidium with 15 short setae; fore tibia with 1 long preapical ad and 1 short apv . Mid femur with 6 a and 1 app ; mid tibia with 1 strong preapical ad , 7 short p and 3 strong apv . Hind femur with 1 preapical ad ; hind tibia with 1 weak preapical ad and 1 short apv . Wing ( Fig. 19 ) slightly yellow, a brown apical spot on R2+3 confluent with subapical spots on R4+5 and M1; basal extremity of brown subapical spot on R4+5 before vertical level of spots on R2+3 and M1, slightly connected with brown spot on dm-cu ; subapical spot on M1 confluent with apical 1/2 of brown subapical spot on R4+5; a brown cloud on dm-cu , constricted at middle; subcostal cell hyaline; costa with 2nd (between R1 and R2+3), 3rd (between R2+3 and R4+5) and 4th (between R4+5 and M1) sections in proportion of 3.2 mm : 0.9 mm : 0.6 mm ; r-m before middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 2.0 mm: 2.9 mm ; ultimate section of CuA1 about 1/7 of penultimate. Halter yellow. Abdomen yellow, tergites 2–6 with black posterior margins and tergites 4–6 each with a brown triangular median spot confluent with black posterior margin. Male genitalia ( Figs. 34–38 ): protandrium more or less U– shaped, not a complete ring; epandrium with three pairs of long dorsal setae, dorsal and ventral margins each with a subapical concavity; surstylus triangular with dense tiny setulae; hypandrium nearly Y–shaped, gonopod slender subuliform in ventral view but broad columnar in lateral view; aedeagal apodeme shorter than aedeagus, aedeagus curved forward and nearly S–shaped in lateral view, with a pair of triangular basal processes slightly extending outwards and a pair of acuate triangular dorsoapical processes in lateral view. FEMALE. Unknown. Type material. Holotype ♂ ( CAUC ), CHINA : Guangdong Province : Ruyuan, Nanling, 26. III. 2003 , Ding Yang. Distribution. China (Guangdong). Remarks. The species is somewhat similar to Homoneura ( Neohomoneura ) tricuspidata Shi & Yang from China (Hainan) in the following characters: wing with basal extremity of brown subapical spot on R4+5 before vertical level of apical spot on R2+3; male abdominal tergites 2–6 each with black posterior margin, tergites 4–6 each with a brown triangular median spot confluent with black posterior margin; surstylus with dense tiny setulae. But it can be separated from the latter by the basal extremity of the brown subapical spot on R4+5 being slightly connected with the brown spot on dm-cu ; a brown cloud present on dm-cu , constricted at middle; the surstylus having no short acuate tip, the aedeagus having a pair of acuate triangular dorsoapical processes. In H . ( N .) tricuspidata , the basal extremity of brown subapical spot on R4+5 is far from the brown spot on dm-cu ; a brown stripe–like spot is on dmcu , not constricted at middle; the surstylus has a short acuate tip, the aedeagus has two furcated lateral processes subapically in the ventral view ( Shi & Yang, 2008 ). Etymology. Latin, bi- , prefix meaning two + concava , meaning concave, referring to dorsal and ventral margin of the epandrium each with a subapical concavity; a feminine adjective.