Homoneura (Homoneura) crassicauda Malloch, 1927

Shi, Li & Yang, Ding, 2014, Supplements to species groups of the subgenus Homoneura in China (Diptera: Lauxaniidae: Homoneura), with descriptions of twenty new species, Zootaxa 3890 (1), pp. 1-117 : 21-22

Homoneura (Homoneura) crassicauda Malloch, 1927

( Figs 81–91 )

Homoneura crassicauda Malloch, 1927: 171 . Type locality: China ( Taiwan). Holotype male in SDEI. Homoneura (Homoneura) crassicauda: Malloch, 1929: 55 . Shewell in Delfinado & Hardy, 1977: 202.

Diagnosis. Mesonotum with acr in 6 rows. Abdominal tergite 5 with a pair of small brown spots, its diameter equal to or shorter than half height of tergite 5; surstylus slender, acute apically and extended straight in lateral view.

Redescription. MALE. Body length 3.3–3.4 mm, wing length 3.2–3.5 mm.

Head ( Figs 82, 83 ) pale yellow. Frons yellow with short setulae (denser than in H. nudifrons ) and a pair of pale brown medial stripes extending to ocellar triangle (sometimes absent), 1.4 times as long as wide and parallel-sided; ocellar triangle pale brown, oc short, about half length of anterior or; anterior or shorter than posterior or. Gena about 1/8 height of eye. Antenna yellow, 1st flagellomere about 1.7 times as long as high; arista almost bare (with microscopic ray), black except for brownish base. Proboscis and palpus pale yellow.

Thorax ( Figs 84, 85 ) pale yellow. Mesonotum with 0+3 dc (1st post-sutural dc clearly behind transverse suture), acr in irregular 6 rows and prsc as long as 1st post-sutural dc. Scutellum pale yellow. Legs pale yellow. Fore femur with 3–4 pv, 6 pd, and ctenidium with 11–13 short setae; fore tibia with 1 long preapical ad and 1 short apv. Mid femur with 5 a and 1 app; mid tibia with 1 strong preapical ad and 2 strong apv. Hind femur with 1 weak preapical ad and a row of av on apical 1/2 (only one is strongest); hind tibia with 1 preapical ad and 2 apv. Wing ( Fig. 86 ) clear; 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 5:1.4:1; r-m at middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 1:1.3; ultimate section of CuA1 about 1/6 of penultimate. Halter pale yellow.

Abdomen ( Fig. 87 ) pale yellow, tergite 5 with a pair of black round lateral spot, its diameter equal to or shorter than half height of tergite 5 in dorsal view. Male genitalia ( Figs 88–91 ): syntergosternite semicircular, lateral arms very narrow; epandrium with four pairs of long dorsal setae; surstylus narrow straight knife-like in lateral view and slightly wide with a small apical teeth in ventral view; hypandrium close to H-shaped with a median ventral process in ventral view, hypandrial apodeme very small; postgonite broad and furcated with three setulae in ventral view; aedeagus slender with two asymmetrical long knife-like dorsal sclerites in ventral view; aedeagal apodeme shorter than aedeagus.

Type material. Paratypes: CHINA, Formosa ( Taiwan): 1 ♂ ( USNM), Kankau (Koshun), VII. 1912, H. Sauter (det. J. R. Malloch); 2 ♂ ( USNM), Chipun, Puyuma-Distr., VII. 1912, H. Sauter (det. J. R. Malloch); 1 ♂ ( USNM), Pilam, VII. 1912, H. Sauter (det. J. R. Malloch).

Distribution. China ( Taiwan).

Remarks. One paratype (an additional male from Kankau in USNM) is actually Homoneura nudifrons ( Kertész, 1913) .

Figures

FIGURES 81 – 87. Homoneura (Homoneura) crassicauda Malloch, 1927. Male. 81. body, lateral view; 82, 83. head, anterior and lateral view; 84, 85. thorax, dorsal and lateral view; 86. abdomen, dorsal view; 87. wing.

FIGURES 88 – 91. Homoneura (Homoneura) crassicauda Malloch, 1927. Male. 88. syntergosternite and epandrium, lateral view; 89. epandrial complex, posterior view; 90. aedeagal complex, ventral view; 91. aedeagal complex, lateral view. Scale bar = 0.1 mm.