Ophiomyia striata sp. nov.

(Figs 54–56)

Type material. Holotype male (QSBG), Loei, Phu Kradueng National Park, 16˚49.099´N, 101˚47.624´E, 275 m a.s.l., 14–20 xi 2006, Malaise trap, Suthin Gong-lasae.

Diagnosis. Black; calypter with fringe white; lunule low; facial carina spindle-shaped; gena broad, vibrissal fasciculus distinct; ultimate section of CuA1 equal to penultimate section in length; surstylus with about eight spines; distiphallus striated distally on lateral side.

Description. MALE. Black; parafrontalia and lunule brown-tinged; ocellar triangle shining; mesoscutum and abdomen moderately shining; wing hyaline, calypter brownish-gray, with fringe whitish.

Frons 1.5 times as wide as eye, converging ventrally; parafrontalia slightly projecting above eye in profile; ors and ori each two; oh reclinate, in row; ocellar triangle with ventral tip blunt, extending beyond level of second ors; lunule narrow, distinctly lower than semicircle, with median furrow; face with carina distinctly raised, forming a spindle below base of antennae; eye 1.2 times as high as wide; gena 1/5 as high as eye, projecting forwards, forming angle of 70˚ in front; vibrissal fasciculus 3/5 as long as srista, with slight upward curvature at base, straight apically. First antennal flagellomere round, with minute pile; arista appearing bare.

Mesoscutum with 0+2 dc, ten rows of acr anteriorly but eight rows behind level of anterior dc. Wing 1.8 mm long; costa extending to M1, with three sections in proportion of 31:10: 7; r-m at distal 1/3 of discal cell (10: 5); M1 ratio 5.4; ultimate section of CuA1 equal to penultimate section in length.

S6 about four times as long as S5, 1.3 times as wide as long, with posterior emargination on median 1/3. Epandrium with surstylus slightly projected, incurved, bearing three apical spines and four or five spinules; cercus small, 2/3 as high as epandrium. Hypandrium 280 µm long, with basal apodeme short, about 1/5 as long as sidearm. Phallapodeme 560 µm long; phallus 330 µm long, distiphallus striated distally on lateral side and spinulose internally; ejaculatory apodeme 160 µm long, blade very narrow, 35 µm wide.

Body length 2.0 mm.

FEMALE. Unknown.

Distribution. Thailand.

Remarks. On external characters this species resembles Ophiomyia cornuta, but it is easily distinguished by its broader facial carina, longer ultimate section of CuA1, and striated distiphallus.

Etymology. The specific name refers to the striated (Latin: striatus) distiphallus.