360 Orthorrhapha brachycera. 



— Middle femora with long, distant bristles below in the 



middle ; hind tibiæ with long hairs and bristles 5. pilosellns. 



Fem åles. 



1. Antennæ quite black 2. 



— Antennæ yellow at the base 7. picticornis. 



2. Epistoma quite brownish yellow ; largest species 1 . scambus. 



— Epistoma more or less white or greyish above 3. 



3. Front coxæ grey or chiefly grey 2. curvipes. 



— Front coxæ yellow or only grey at the base 4. 



4. The convexity on the last part of the discai vein a little 

 darkened ; hind metatarsus shorter than the second joint . . 3. loripes. 



— The convexity on the last part of the discai vein generally 

 not darkened ; hind metatarsus as long as or about as long 



as the second joint 5- 



5. Larger species, 2 — 2,3 mm ; epistoma grey above 4. artnatus. 



— Quite small species, 1,5 — 1,7 mm; epistoma more yellowish G.puniilio. 



The female to pilosellus is unknown. 



1. C. scambus Fall. 



1823. Fall. Dipt. Suec. Dol. 19,36 (Dolichopus). — 1824. Meig. Syst. 

 Beschr. IV, 68,18, et 1830. VI, 364 (Medeterus) .— 1843. Zett. Dipt. Scand. 

 II, 598, 85, et 1855. XII, 4637, 85 {Dolidwpiis) . — 1862. Schin. F. A. I, 

 234. — 1903. Kat. palåarkt. Dipt, II, 346. — Medeterus prodromus Meig. 

 1824. Syst. Beschr. IV, 69, 9. 



Male. Vertex and frons bluish black. Epistoma brownish yellow. 

 Palpi dark brown. Occiput somewhat æneous, greyish pruinose ; post- 

 ocalar bristles black, the hairs below white. Antennæ black, third 



Fig. 110. Antenna of C. scambus d. X 75. 



joint triangular. Thorax dark olive or somewhat æneous or dark 

 greenish, dark violet behind, generally with a more greenish middle 

 stripe; it is slightly brown pruinose; scutellum bluish. Pleura greenish 

 or æneous, grey pruinose, especially below and behind; propleura 

 with some pale hairs and a black prothoracic bristle. Abdomen green, 

 sometimes æneous or coppery, or with violet reflexes above, especi- 

 ally along the middle, slightly greyish pruinose; it is clothed with 

 short, black hairs and has very short hindmarginal bristles at the 

 sides, long on the first segment. Venter grey. Legs yellow, posterior 



