Nepalomyia yangi, Grootaert, 2013

Grootaert, Patrick, 2013, New Nepalomyia Hollis (Diptera: Dolichopodidae) From Singapore And South Malaysia, Raffles Bulletin of Zoology 61 (1), pp. 103-116 : 109-110

Nepalomyia yangi , new species

( Figs. 12–15 )

Material examined. — Holotype male, SINGAPORE: Sime Forest , 8 Apr.2005, forest, sweep netting (MS name: Si 740; reg. 25053, Si 740, coll. P. Grootaert).

Paratypes: 1 male, Sime Forest , 8 Apr.2005, forest, Mal 1, (reg. 25049, Si 683, coll. PG) ; 1 male, Sime Forest , 27 Apr.2005, forest, Mal 1, (reg. 25093, Si 904, coll. PG) ; 1 male, Sime Forest , 3 Jun.2005, forest, Mal 1, (reg. 25134, Si 908, coll. PG) ; 1 male, Sime Forest , 20 May 2005, forest, Mal 1, (reg. 25131, Si 910, coll. PG) ; 1 male, Sime Forest , 13 May 2005, forest, Mal 1, (reg. 25129, and hypandrium dorsally.

Si937, coll. PG); 1 male, Sime Forest , 13 May 2005, forest, Mal 2, (reg. 25130, Si942, coll. PG) ; 1 male, Sime Forest , 23 Sep.2005, forest, Mal 2, (reg. 25364, Si1072, coll. PG) .

Etymology. — The present species is dedicated to Prof. Ding Yang ( China Agricultural University) who described many Nepalomyia species from Oriental China.

Diagnosis. — Small species with triangular third antennal segment about 1.8 times as long as wide. Aedeagus long, pale; surstyli finger-like brown; cerci very short.

Male: Body length: 2.1 mm; wing length: 1.8 mm.

Head. Vertex brownish black, surpassing level of upper eye margin. Occiput concave. Face blackish brown, shining, parallel-sided, as wide as base of third antennal segment. Clypeus very feebly bulging out. Palpus dark brown, with a black apical bristle. Rostrum yellowish brown. Ocellar tubercle prominent. 2 strong black ocellars, 2 postverticals, nearly as long as the postocellars, but less strong; 2 tiny postocellars. Postocular bristles uniseriate, black. Antenna brown: Second segment with a circle of short marginal bristles and a long dorsal bristle. Third segment triangular ( Fig. 12 ), 1.8 times as long as wide. Arista 3.8 times as long as third segment: pubescence short in basal third, longer apically.

Thorax brown, not shining, pleurae partly somewhat lighter coloured. A shallow prescutellar flattened area. Postscutellum with a median mound. Acr biseriate, short. 5 dc (growing longer posteriad and ending in a long prescutellar). 1 long humeral and 1 shorter posthumeral, 1 short presutural, 2 short postsutural; 1 very long pre-alar; 1 very long post alar, 2 long notopleurals; scutellum with 2 strong marginals with a short hair at side. 1 long black propleural bristle, just above coxa.

Legs. Yellow with mid and hind coxae brown. Bristles and hairs black. Fore coxa anteriorly with short hairs ending in 3 long bristles near tip of coxa. Fore femur without bristles, bearing only 2 very short, hairlike preapical pv. Fore tibia without bristles. Mid coxa with numerous anterior bristles and 1 very long black bristle below middle. Mid femur with an anterior preapical, no posterior preapical. Mid tibia: 2 ad, 2 weaker pd; 3 bristles in apical crown. Hind coxa with a black exterior bristle, shorter than on mid coxa. Hind femur with an anterior preapical; no posterior preapical and no other bristles. Hind tibia with a thin and short, hair like dorsal bristle beyond middle. A short dorsal preapical. No real apical crown of bristles, only a distinct ventral. Posterodorsal comb short ( Fig. 13 ), with a minute denticle below. First segment of hind tarsus less than half as long as second segment, a little thicker than following segment; with a brown basal pointed “spur” pointing to tibia. Claws on all legs minute, symmetrical.

Wing faintly brownish tinged with brown veins. Joint of R 2+3 and R 4+5 indistinctly swollen. Apical part of M 3+4 about 2.5 times as long as tp. Anal vein distinct at base, running parallel to posterior wing margin, but not reaching the

margin. Squama with fan of long, black cilia. Halter with pale knob and stalk.

Abdomen brown. Hairs and bristles on terga short, all marginals distinct but only half as long as tergite is long. Sterna pale brownish with indistinct marginals. Genital capsule ( Fig. 14 ) globular, dark brown. Cerci very short, with a wide basal part and very short apical part bearing a strong bristle. Surstyli elongate, simple in structure, brown in contrast to paler aedeagus; hardly half as long as genital capsule is long. Hypandrium ( Fig. 15 ) pale, furcate. Aedeagus yellowish, long, quite simple. A long pale, epandrial bristle present, inserted on a short tubercle; with a short bristle at base.

Female: unknown.

Remarks. — See key to the species.

Figures

Figs. 12–15. Nepalomyia yangi, new species: 12, antenna with detail of apex; 13, hind basitarsus; 14, genital capsule; 15, tip of aedeagus