Teuchophorus stenostigma, Meuffels & Grootaert, 2004

Meuffels, Henk & Grootaert, Patrick, 2004, The genus Teuchophorus in South-East Asia and New Guinea, description of new species, species-groups and their phylogeny (Insecta, Diptera, Dolichopodidae), Journal of Natural History 38 (2), pp. 143-258 : 237-239

Species 61: Teuchophorus stenostigma sp. nov. (male and female) (figures 235–238)

Etymology. Greek: stenós, ‘narrow’, stigma, ‘stigma’.

Diagnosis. Medium-sized species, with a narrow, yellow stigma. Eyes separated. Antenna largely yellow; third segment blunt, about as long as deep. Legs and coxae very pale yellow. Pleurae mostly yellowish brown. Legs poorly bristled. Hypopygium yellow.

Material examined. Type material: Thailand: Trang province, 6 km down Klong L., river banks, gallery forest, 27 October 1997,    male and     : three males, seven females (No. 97128, leg. P. Grootaert) .

Male

Body length 1.4–1.45 mm; wing length 1.3–1.4 mm.

Head. Frons and face with shining dark metallic green ground colour. Face about three-quarters times as wide as depth of third antennal segment. Palpi small, yellow, each with a small, thin black apical bristlet. Rostrum yellow. Occiput shining blackish green. Chaetotaxy as usual; no postocellars. Postoculars uniseriate, short, black. Antenna (figure 235): yellow; apical margin of second segment brownish. Marginal bristles on second segment very short, longest above. Third segment rounded triangular, with downward shifted blunt apex, about as long as deep. Arista about three times as long as antenna, shortly pubescent; basal aristal segment slightly more than half as long as third antennal segment.

Thorax. Mesoscutum and scutellum shining dark metallic green, brownish towards sides and anterior part of thorax. Pleurae largely yellowish brown, with a feeble green gloss on mesopleura; metapleura with blackish anterior margin. Chaetotaxy as usual; acr uniseriate, moderately long. Two tiny propleural hairlets.

Legs. Legs and coxae very pale yellow.

Fore leg. Coxa anteriorly with very short pale hairs that become longer and darker towards apex of coxa. Femur without bristles. Tibia slightly shorter than femur, without bristles or serration. First tarsal segment ventrally shortly spinulose, and with a small black spinule at ventral base. Length of tibia and tarsal segments (in mm): 0.35:0.17:0.08: 0.06: 0.05:0.06.

Mid leg. Coxa anteriorly with very short pale hairs. Femur with hairs of the posteroventral row very slightly lengthened; a weak preapical pv, and a yet thinner preapical av. Tibia slightly longer than femur; two ad, one pd, one av, all weak. Length of tibia and tarsal segments (in mm): 0.5: 0.2:0.11: 0.09:0.06:0.07.

Hind leg (figure 236). Coxa with a thin, black exterior bristle. Femur with a small preapical av, and some of the hairs of the anteroventral row near tip very slightly lengthened. Tibia about as long as femur; three weak dorsal bristles; one very short and weak ventral bristlet. Length of tibia and tarsal segments (in mm): 0.5:0.12:0.16: 0.1:0.07: 0.07.

Wing. Wing (figure 237) very feebly brownish tinged. A narrow, lanceolate, pale brownish yellow stigma, occupying less than half the width of subcostal cell. r4+5 and m1+2 very slightly diverging. Halters yellow. Squamae yellow, with blackish border, and brown cilia.

Abdomen. Abdomen dorsally dark brown or brown, with a feeble greenish gloss. Sterna brown. Hairs and hind-marginal bristlets on terga short, dark. Hypopygium (figure 238) yellow, with tips of surstyli black.

Female

Body length 1.3–1.5 mm; wing length 1.25–1.4 mm.

Face hardly broader than in male. Wing without stigma, but costa slightly thickened. Oviscapt with a row of short black acanthae.