Therevidae. 149 



6. T. bipunctata Meig. 



1820. Meig. Syst. Beschr. II, 121,9. - 1842. Zett. Dipt. Scand. I, 205, 

 4 et 1859. XIII, 4971,4. — 1847. Loew, Dipt. Beitr. II, 26, 15. - 1862. 

 Schin. F. A. I, 169. — 1903. Kat. palåarkt. Dipt. II, 208. 



Male. Frons and face yellowish pruinose; frons with black and 

 above the antennæ with yellow hairs, cheeks with pale yellow to 

 whitish hairs, the black hairs on tbe frons only extending a little 

 downwards, not reaching the jowls. Occiput yellowish with yellow 

 hairs, occipito-orbital bristles black; the hairs on the vertex black. 

 Antennæ blackish, the first joint greyish pruinose ; the first two joints 

 with black hairs and on the basal part of the first joint pale hairs. 

 Thorax brownish to dark brown, with two lighter, faint stripes. The 

 disc is sparingly clothed with erect, blackish, and more densely with 

 somewhat more decumbent, yellow hairs. There are as a rule two 

 dorsocentral bristles. Sterna and pleura grey with long, yellow, 

 farther down, paler hairs. Abdomen blackish, at the hind margin of 

 the segments a broad, but somewhat indistinctly bounded, greyish or 

 greyish yellow, transverse band which is not broader towards the 

 sides; on the second and third segments the black colour is often 

 prolonged triangularly backwards in the middle, the greyish band 

 thus being triangularly incised, but somewhat indefinitely; the last 

 segments are quite or nearly quite greyish, The hind margins are 

 yellow to whitish yellow. Abdomen clothed with long, yellow hairs, 

 in the middle line there are black hairs to a more or less extent. 

 Venter grey with yellow hind margins of the segments ; it is sparingly 

 clothed with long, pale yellow hairs. Genitalia ferrugineous beneath. 

 Legs with the femora greyish black, tibiæ yellow, brownish or blackish 

 just at the apex, tarsi yellowish, towards the ends brownish black. 

 Goxæ and anterior femora with long, pale yellowish hairs, on the 

 front femora more or less intermingled with black hairs. Wings 

 slightly yellowish; veins yellow to brown; the fourth posterior cell 

 closed. Stigma yellow. Balteres blackish, the peduncle paler, yel- 

 lowish brown. 



Female. Vertex and frons yellowish pruinose, with black hairs; 

 cheeks w^hite with white hairs; no black hairs on the jowls or only 

 very few; the hairs somewhat shorter than in the male. Frontal 

 callus divided into two large, round, somewhat convex tubercles. 

 Thorax with the two stripes more or less distinct; the erect, black, 

 and depressed, yellow hairs short. Pleura and sterna grey with white 

 hairs. Abdomen with the greyish, transverse bands much more 

 definitely bounded than in the male; the seventh segment black but 

 with the hind margin and the sides more or less greyish pruinose. 



