Bisubcosta oligoradiata L. PAPP, 2006

Papp, L., Merz, B. & Földvári, M., 2006, DIPTERA OF THAILAND A summary of the families and genera with references to the species representations, Acta Zoologica Academiae Scientiarum Hungaricae 52 (2), No. 2, pp. 97-269 : 129-130

Bisubcosta oligoradiata L. PAPP , sp. n.

( Figs 126–128 )

Holotype male ( HNHM, apex of right fore tibia with tarsi and left hind tarsomeres 2–5 lost): THAILAND: Ban Na Lae , nr Pua, over a rocky forest brook, Nov 5, 2004, No. 19, leg. L. PAPP & M. FÖLDVÁRI.

Measurements in mm: body length: head plus thorax 1.70, abdomen (downcurved) ca. 5.02, all body 6.63, wing length 3.37, wing breadth 1.53.

Frontal tubercle sharp, triangular, strongly protruding from the depressed preocellar frons. Distance of eyes at proboscis only 0.085 mm, i.e. much less than one half of prosternum (2× 0.11 mm).

Scutum brown with thin darker brown oblique bands, approaching and united at the level of wing base, and with long prealar and supraalar setae. Scutal setae otherwise evenly distributed. Metanotum whitish. Scutellum 0.39 mm broad, 0.16 mm long. Antepronotum laterally, proepisternum and postpronotum (prestigmal ridge, i.e. not directly before anterior stigma) with long black setae. Anepisternum anterodorsally with ca. 10 short setae.

Coxal length 1.065, 1.23 and 1.17 mm. Femora yellow with dark bases and apices, fore tibia brown, mid and hind tibiae black, tarsi brown. No apical spur on fore tibia, but a row of sharp apical setae on ventral half (not a tibial comb), i.e. no regulr comb on t1. Both tibial apical combs strong on hind tibia, lateral comb of t2 normal, but a less distinct comb present medially on t2. Mid tibial apical spur 0.63 mm, hind tibial spur 0.80 mm, both thickly hairy. Legs (in mm): f1 1.195, t1 1.90, mt1 2.62, f2 1.64, t2 2.13, mt2 2.23. Claws minute, thin, straight and perpendicular, no pulvilli.

Common section of Rs and M1–2 continued backwards in a long and rather thin brown spot, almost to radial trunk ( Fig. 127 ). M1–2 stalk 0.78 mm, M1 1.98 mm. Veins R1 and Cu1 thick, black, Cu2 short but comparatively very thick. R5 thick and even thicker from basal Ľ to almost its apex.

Abdomen dark brown, S2 and S3 with a pair of long yellow bands, S4 to S6 with central yellow areas. Tergite 0.49 mm long, very narrow, tergite 2 0.92 mm, tergite and sternite 8 short, narrow and mostly hidden in the 7th sclerites.

Etymology. The specific epithet (noun) refers to the missing R4 vein.

Figures

Figs 126–128. Biscubcosta oligoneura sp. n., holotype.126 = base of right wing, 127 = apical half of left wing, 128 = apex of flagellums