144 Orthorrhapha brachycera. 



yellow hairs. The six specimens I have examined had all four dorso- 

 central bristles. Pleura and sterna greyish, with pale yellow and 

 blackish hairs intermingled. Abdomen black, at the apical part of 

 the segments slightly brownish; the hind margin of the segments yel- 

 low. Abdomen clothed with deep yellow or reddish yellow hairs, in 

 the middle line and towards the hind margin of the segments there 

 are black hairs ; the black hairs may be more or less extended, some- 

 times occupying the whole dorsal side; at the apex of abdomen the 

 hairs are all black. Venter blackish grey with the hind margins of 

 the segments yellow, it is clothed with long, yellow or pale yellow 

 hairs. Genitalia blackish above, ferrugineous beneath, with ferrugineous 

 hairs. Legs with the coxæ and femora greyish black, tibiæ yellow, 

 black just at the apex, tai'si yellow; black towards the end. Coxæ 

 and anterior femora with long, yellow hairs, more or less intermingled 

 with black on the front femora; hind femora with depressed, yellow 

 hairs. Wings yellowish brown tinged, with a blackish blotch passing 

 in a cm-ve from the medial cross-vein above the discai cell and down 

 over the veins closing the discai cell apically; the base of the cubital 

 fork, the basal part of the upper branch of the postical vein and the 

 postical cross-vein also blackish fumigated ; the stigma yellowish brown ; 

 veins yellow to brown; the fourth posterior cell closed. Balteres 

 blackish brown. 



Female. Frons and face yellowish pruinose, down the cheeks 

 white; frontal cailus cordate, strongly excised below, truncate above, 

 reaching to the ocellar tubercle; the hairs short, black on vertex and 

 frons, white on the face; a tuft of black hairs on the jowls. Thorax 

 with short, erect, black, and with quite depressed, yellow hairs; the 

 longitudinal stripes somewhat broad and distinct. Sterna and pleura 

 light grey with whitish hairs. Abdomen black, at the hind margins 

 of the segments a transverse, greyish spot on each side, on the second 

 and third segments the spots are somewhat connected along the 

 hind margin ; the first four segments sparingly clothed with depressed, 

 black, and at the hind margin with yellow hairs, the last three seg- 

 ments with short, erect, black hairs; the fourth segment has both 

 erect and depressed hairs; the seventh segment quite shining black. 

 Venter shining black with the hind margins of the segments pale; it 

 is clothed with long, pale hairs basally, and with short, black hairs 

 on the four last segments. Femora with short hairs. 



Length 8,5 — 10,5 mm. 



This species is easily recognised among the Danish species by 

 the blackish, curved blotch on the wing; it is also characterised by 



