186 Orthorrhapha brachycera. 



Male. Vertex and frons grey dusted ; ocellar tiibercle dark. Epi- 

 stoma not narrow, grey; elypeus bent angularly inwards. Palpi black. 

 Occiput greenish, greyish pruinose; postocular bristles black. Antennæ 

 black, not as long as the head, the third joint about as long as 

 broad, triangularly pointed; arista distinctly short-haired. Thorax 

 dark green or æneous green, rarely æneous, it may sometimes be 

 brighter in the middle; it is slightly pruinose, shining; scutellum 



y/- 



Fig. 53. Antenna of fi. ceUr c5", from the inside. X 80. 



haired with dark hairs, brownish at the margin. Pleura greenish, 

 grey pruinose ; propleui'a with a few pale hairs and a black prothoracic 

 bristle. Abdomen dark green or somewhat æneous, very slightly 

 pruinose downvvards; it is clothed with short, black hairs, and has 

 hindmarginal bristles, which are longer on the first segment. Venter 

 greenish, grey pruinose, with yellow or brownish hairs, somewhat 

 long at the base. The hypopygium is constructed quite as in the 

 preceding species; the outer lamellæ are small, broader than long, of 

 yellow colour and with somewhat short hairs at the margin. Legs 

 yellow, coxæ grey with the apex yellow; the tarsi with the apex of 

 metatarsus and the four following joints black; hind metatarsus con- 

 siderably shorter than the second joint. The legs have short, black 

 hairs; posterior femora with one preapical bristle; front tibiæ with a 

 few bristles above, but none below; middle tibiæ with two rows of 

 bristles above and one ventral bristle; hind tibiæ likewise with two 

 rows of dorsal bristles, and some smaller ventral bristles. Wings a 

 little tinged; veins black, costa thickened on a streak between the 

 base and the apex of the sQbcostal vein, and also somewhat thick 

 from the apex of the subcostal vein and outwards; discai vein with 

 a very slight bend and parallel with the cubital vein; axillary lobe 

 small. Squamulæ yellow, with a black fringe. Halteres yellow. 



Female. Epistoma broader than in the male, grey. Antennæ 

 shorter. Wings more tinged, with the thickness at the base of costa 

 present, but thinner than in the male. 



Length 3,3 — 3,8 mm. 



R. celer is common in Denmark; Lersø, Charlottenlund, Ordrup 

 Mose, Ermelund, Hillerød, Frederikssund, Faxe Ladeplads, and on 



