178 Orthorrhapha brachycera. 



clothed with short, black hairs, and has hindmarginal bristles, which 

 increase in length towards the end, and also are longer on the first 

 segment. Venter greenish, grey pruinose, with short, pale hairs. Hypo- 

 pygium somewhat high, black or a little greenish, greyish pruinose; 

 eighth segment with strong, black hairs; on the ventral side of the 

 hypopygium there are lobes in the middle, they are broad, stretching 

 downwards and with a styliform apex directed backvvards and a little 

 upwards ; at the end there are two pairs of inner lamellæ, the lateral 

 narrow, directed backwards, attenuated to a thin apex ending in a 

 small bristle, and with a bristle at the upper margin; the median 

 inner lamellæ are broad in the basal part, pointed and curved some- 

 what downwards; the dorsal median appendage is hairy above; the 

 outer lamellæ are large, somewhat roundish triangular, with a broad 

 end and the dorsal margin straight; they are blackish brown, the 

 apical and a part of the ventral margin has small teeth with hairs, 

 which are angularly curved at the apex, besides there are long, evenly 

 curved hairs; the dorsal margin has shorter hairs. Legs with the 

 coxæ blackish grey, front coxæ whitish pruinose anteriorly; all coxæ 

 a little yellowish at the apex; femora greenish black, a little greyish 

 pruinose; tibiæ yellow with the very base black, and hind tibiæ with 

 the apex blackish; anterior tarsi with the apex of metatarsus and the 

 four following joints black; hind tarsi black, the first joint as long as 

 the second. The legs have short, black hairs, front coxæ partly white- 

 haired; posterior femora with one preapical bristle; front tibiæ with 

 bristles above and one or two on the postero-ventral side; middle 

 tibiæ with two dorsal rows of bristles and a ventral bristle; hind 

 tibiæ with two dorsal and a ventral row; middle metatarsi with some 

 bristles on the antero-ventral, and one long bristle on the postero- 

 ventral side. Wings brown, most towards the anterior margin; veins 

 black; discai vein with an obtuse but not small bend, and converging 

 towards the cubital vein; axillary lobe not large. Squamulæ yellow, 

 with a black fringe. Balteres yellow, the base of the peduncle a 

 little darker. 



Female. Epistoma only shghtly broader than in the male, more 

 grey. Antennæ of about the same length as in the male. The bristles 

 below the middle metatarsi shorter, and no long postero-ventral bristle 

 present. 



Length 5,4 to about 6 mm. 



H. Sahlbergi is rare in Denmark, it has only been taken at one 

 occasion, at Frijsenborg in Jutland in July (H.J.Hansen).. 



Geographical distribution: — Northern and middle Europe down 

 into France ; towards the north to northern Scandinavia, and in Siberia. 



