126 Orthorrhapha brachycera. 



Geographical distribution : ^ — Northern and middle Europe down 

 into France; towards the north to northern Scandinavia, in Finland 

 and in Siberia. 



Remarks: Tliis and tiie foregoing species are somewhat similar, 

 but in the males they are at once distinguished by the different hypo- 

 pygium, and by the presence of a long hair at the tip of the front 

 tibiæ in lotigicornis, further by the antennæ and several other charac- 

 ters. The females are distinguished especially by the colour of the 

 antennæ, which also have the third joint longer and more pointed in 

 longicornis. On the other hånd the fringes of the squamulæ afford 

 no character; Schiner says, that the male of longicornis has generally 

 a black fringe, and Verrall (Ent. Month. Mag. XV, 1904, 196) has the 

 female of longicornis in the analytical table in a division with black- 

 fringed squamulæ ; already Stannius (1. c.) gives for the male of acuti- 

 cornis a yellow fringe, and for longicornis a black fringe, but he says 

 nothing about the females. I have always found the fringes equal in 

 colour in the two species viz. yellow in the males, and yellow with 

 more or less numerous black hairs intermingled, until quite black, 

 in the females. — While the two species are easily distinguished 

 from one another, the females are on the other hånd somewhat similar 

 to several other species, but they are distinguished partly by the 

 somewhat long, pointed antennæ, and partly by the yellow hind coxæ. 



33. D. nubilus Meig. 



1824. Meig. Syst. Beschr. IV, 96, 39. — 1831. Stann. Isis 1831, 133, 

 26. — 1842. Stæg. Krøyer's Tiddskr. IV, 32,24. — 1843. Zett. Dipt. Scand. 

 II, 505, 4, et 1849. VIII, 3076, 4. - 1862. Schin. F. A. I, 215. — 1903. 

 Kat. palåarkt. Dipt. II, 301. 



Male. Vertex and frons green, sometimes blue. Epistoma nar- 

 row, white, and with a slight but distinct, white pubescence. Palpi 

 yellow. Occiput green or æneous, greyish pruinose; postocular bristles 

 white below, black above. Antennæ about as long as the head, third 

 joint triangular, not or slightly longer than broad ; they are black, the 

 basal joint may be a little lighter below at the apex. Thorax dark 

 green, sometimes somewhat golden or æneous, slightly pruinose, shin- 

 ing; scutellum fmely yellow pubescent; postscutellum green, greyish 

 pruinose. Pleura greenish, grey pruinose; propleura with fine, pale 

 hairs and a black prothoracic bristle. Abdomen dark green with 

 more or less distinct, golden or coppery reflexes; it is slightly whitish 

 pruinose at the sides, and has dark hind margins to the segments; it 

 is clothed with short, black hairs, and has longish hindmarginal bristles, 



