224 Orthorrhapha brachyeera. 



generally somewhat long and slender, hind metatarsus of about the 

 same length as the second joint or slightly longer. Hind coxæ with 

 a bristle on the outside; femora without preapieal bristles ; front femora 

 with somewhat bristly hairs below; middle tibiæ with one or two 

 antero-dorsal and a couple of small postero-dorsal bristles, besides a 

 ventral bristle, The legs are sometimes specially haired in the male. 

 Thcre are two claws, two not small pulvilli, and a narrow empodium 

 with bristles below and thus somewhat comb-shaped. The pulvilli 

 on the front tarsi are in the males strongly enlarged, sometimes only 

 moderately; they may also (in non Danish species) be enlarged on the 

 middle or on all tarsi. In the males with their enlarged pulvilli on 

 the front tarsi, these tarsi have no claws, and this curiou s feature 

 may be very characteristic for the genus. I have only examined the 

 three Danish species, and in all these the front tarsi in the males 

 have no claws; how it may be in the cases where also the posterior 

 tarsi have enlarged pulvilli, I do not know. Wings rather broad, 

 especially towards the base, as the axillary lobe is somewhat large; 

 the mediastinal vein terminating in the subcostal vein; discai vein 

 straight, parallel with the cubital vein; posterior cross-vein in or about 

 in the middle; anal vein not reaching the margin. The last part of 

 the discai vein has a convexity about in the middle. Squamulæ 

 small, with a small angulary lobe, bearing a long fringe of somewhat 

 few hairs; the inner part of the squamulæ short-haired. 



The developmental stages are not known. 



The species of DiapJiorus occur on bushes and in low herbage, 

 generally in more or less humid and shaded piaces. 



Of the genus 13 species are at present known from the palæarctic 

 region; 3 have been found in Denmark. 



Tahle of Species. 



1. Legs mainly black; abdomen in the male without 



yellow colour 3. nigricans. 



— Legs more or less yellow; abdomen in the male yel- 

 low at the base 2. 



2. Anterior femora blackish on the basal half, hind 

 femora quite blackish; the male with the second ab- 

 dominal segment quite, and generally more or less 

 of the third, yellow; front tibiæ with short hairs 



below 1 . oculatus. 



— Anterior femora mainly yellow, hind femora with the 

 basal half yellow; the male with the second abdominal 

 segment only partly yellow; front tibiæ with long 



hairs below 2. Hoffmannseggii. 



