218 Orthorrhapha brachycera. 



indistinct, lighter stripes in the middle, abbreviated behind, the median 

 the lightest. On the disc there are five long, black dorsocentral 

 bristles, but no acrostichal bristles. Further a small humeral bristle, 

 a posthumeral, a notopleural and a postalar bristle, all black, but 

 there is no supraalar bristle. Scutellum with two black marginal 

 bristles. Pleura slate-grey, metapleura with fine, pale hairs. Abdomen 

 olive-brown above, in certain directions with an almost reddish reflex; 

 the sides together with the venter slate-grey; it is sparingly clothed 

 with very short, pale hairs, only longer on the first segment. The 

 two pairs of genital lamellæ somewhat narrow, straight, the lower 

 grey, the upper longer, shining black. Penis brown, thin, curved at 

 the apex. Legs black; coxæ greyish pruinose. The legs have short, 



Fig. 89. Wing of Cl. nigra. 



pale hairs, towards the end of the hind tibiæ they are a little longer; 

 below the front femora there are two rows of very short, chiefly 

 black, spine-like bristles. Wings somewhat blackish tinged. Veins 

 black; costa only with fine hairs. Balteres black. 



Female. Quite similar to the male except the ditferences in the 

 exterior genitalia; front femora without bristles. 



Length 3,4—4 mm. 



Cl. nigra has first been known as belonging to our fauna in this 

 year (1910), when I caught it at Hald near Viborg in Jutland, on 

 25/6 and ^'^/e; it was present in great numbers at a saw-mill, sitting 

 on a boarding constantly washed by water; it was taken severa] 

 times in copula. 



Geographical distribution : — Europe down into France ; its northern 

 hmit seems to lie in Denmark. 



II. Subg. Heleodromia Hal. 



Wings more or less spotted on account of a seaming of the 

 cross-veins. No stigma. The discai cell not long, truncate at the 

 apex; anal vein long, nearly reaching the margin. Glypeus not 

 separated from the epistoma, \vith the margin straight. Jowls not 

 descending below the eyes, and hence the cheeks and jowls not con- 



