Nepalomyia spinata, Grootaert, 2013

Grootaert, Patrick, 2013, New Nepalomyia Hollis (Diptera: Dolichopodidae) From Singapore And South Malaysia, Raffles Bulletin of Zoology 61 (1), pp. 103-116 : 106-107

Nepalomyia spinata , new species

( Figs. 5–8 )

Material examined. — Holotype male, SINGAPORE: Nee Soon , 16 Mar.2005, swamp forest, Mal 3 (MS name Si 494; reg25017, Si 494, coll. P. Grootaert).

Paratypes: 1 male, Nee Soon, 3 Dec.2003, swamp forest, Mal 2, (reg. 23104, Si38, coll. PG); 2 males, Nee Soon, 25 Mar.2005, swamp forest, Mal 3 (reg25030, Si607, coll. PG).

Etymology. — The name spinata refers to the small black spines on the hind basitarsus.

Diagnosis. — A small species with third antennal segment triangular, slightly longer than wide (1.1×). Hind basitarsus in male with 3 black spines.

Male: Body length: 1.82 mm; wing length: 1.56 mm.

Head. Vertex brownish black, surpassing level of upper eye margin. Occiput concave. Face blackish brown, not shining, parallel-sided, as wide as 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 ocellars, but less strong; 2 tiny postocellars. Postocular bristles uniseriate, black. Antenna brown ( Fig. 5 ), basal segments slightly darker than third segment. Second segment with a circle of short marginal bristles and a longer dorsal bristle. Third segment triangular, 1.1 times as long as wide. Arista 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, but still half as long as dc. 5 dc (growing longer posteriad and ending in two 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 fine black propleural bristle.

Legs. Yellow with mid and hind coxae pale brown. Bristles and hairs black. Fore coxa anteriorly with short black hairs ending in 3 longer bristles near tip of coxa; near base a few minute erect hairs. Fore femur without bristles, bearing only 2 very short, hairlike preapical pv. Fore tibia without bristles. Mid coxa with numerous anterior bristles and 1 black exterior bristle. Mid femur with an anterior preapical, no posterior preapical. Mid tibia: 2 ad, 1 weaker pd; only 2 strong bristles in apical crown. Hind coxa with a short, black exterior bristle. Hind femur with an anterior preapical; no posterior preapical and no other bristles. Hind tibia with a thin and short, hairlike dorsal bristle near middle. Dorsal preapical short. No real apical crown of bristles, only a distinct ventral bristle. Posterodorsal comb short ( Fig. 6 ), with a minute denticle below. First segment of hind tarsus about half as long as second segment, a little thicker than following segment; with a brown basal “spur” pointing to tibia and with 3 distinct black curved spines. Claws on all legs minute, symmetrical.

Wing faintly brownish tinged with brown veins. Basal joint of R 2+3 and R 4+5 swollen into an indistinct node. Apical part of M 3+4 about 2.5 times as long as tp. Anal vein indistinct (merely a fold at base). Squama with fan of long, black cilia. Halter with pale knob and stalk.

Abdomen brown. Hairs and bristles on terga short, marginals not half as long as tergite is long. Sterna pale brownish and long marginals on sternites 3 and 4. Genital capsule ( Fig. 7 ) globular, brown. Cerci pale yellow, with a narrow yellowish leaf-like bristle near tip; surstyli elongate, brown in contrast to paler cerci. Hypandrium pale, large and broad, symmetrical furcate ( Fig. 8 ). Aedeagus rather short, its apex furcate.A long pale, epandrial bristle present, inserted on a short tubercle; with a short bristle at base.

Female: unknown.

Remarks. — N. spinata , new species is the only species that has three black spines on the hind femur: two dorsal and one apical. Remarkable is also that the face is grey dusted while in most other species it is shining metallic blue.

Figures

Figs. 5–8. Nepalomyia spinata, new species: 5, antenna; 6, hind basitarsus; 7, genital capsule; 8, tip aedeagus and hypandrium.