Dolichopodidae. 291 



long; they are obliquely cut at the apex, narrow, of brownish or 

 pale brownish colour and hairy, especially with a somewhat long 

 hair at the apex. Legs yellow, also the coxæ; the tarsi with about 

 the three last joints dark, or on the hind tarsi the four last joints; 

 hind metatarsus slightly shorter than or almost as long as the second 

 joint. The legs have short, black hairs; the middle coxæ have a 

 somewhat strong, flat, black apical spine; front coxæ with about 

 three, middle coxæ with two, and hind coxæ with one black bristle; 

 the middle femora have a preapical bristle; front tibiæ with a bristle 

 above near the base, and below it a short ciliation; middle tibiæ 

 with about two antero- and two postero-dorsal bristles, and hind 

 tibiæ likewise. Wings somewhat brownish or greyish tinged; veins 

 black, cubital and discai vein about parallel. Squamulæ yellow, with 

 a yellow fringe. Halteres pale yellow. 



Female. Epistoma broader than in the male, grey. Palpi large, 

 yellow. Antennæ short, third joint somewhat triangular. Abdomen 

 without yellow bands. Legs as in the male, middle coxæ with- 

 out spine. 



Length 2 — 2,4 mm. 



X. fasciatum is rare in Denmark; Ordrup Mose, Bøllemosen, Ryget 

 Skov at Farum Sø and at Boserup near Roskilde. My dates are in 

 May. It occurs on somewhat humid piaces. 



Geographical distribution: — Northern and middle Europe down 

 into France; towards the north to middle Sweden, but rare. 



2. X. monotrichum Loew. 



1850. Loew, Stett. ent. Zeitg. XI, 132,30, Tab. L Fig. 36— 37, et 1857. 

 Neue Beitr. V, 31 (Rhaphium). — 1862. Schin. F. A. I, 195 (Rhaphinm). 

 — 1903. Kat. palåarkt. Dipt. 11, 335. — Bhaphmm caliginosum 1843. Zett. 

 Dipt. Scand. II, 461, 4. p. p. — Rhaphium macrocerum 1849. Zett. Dipt. 

 Scand. VIII, 3057, 3. 



Male. Vertex and frons cyan-blue. Epistoma somewhat narrow, 

 silvery white. Palpi small, greyish. Occiput greenish, greyish pruinose: 

 postocular hairs black above, whitish below. Antennæ black, long, 

 the third joint elongated, band-shaped, more than twice as long as 

 the short arista. Thorax dark or blackish green, a little pruinose, 

 somewhat shining. Pleura greenish, grey pruinose; propleura with 

 pale hairs. Abdomen dark green, more or less with æneous or 

 coppery reflexes; it is clothed with short, black hairs, a little longer 

 and paler at the sides in front, and it has small hindmarginal bristles, 

 a little longer on the flrst segment; the eighth segment with longish, 

 somewhat dense hairs. Venter greenish, grey pruinose, with longish, 



19* 



