260 Orthorrhapha brachycera. 



line or almost hyaline. Veins blackish; the cubital vein curved dis- 

 tinctly downwards towards the apex; the discai vein thin from the 

 base to somewhat behind the discai cross-vein, outwards to this cross- 

 vein it has a distinct curve with the convex side downwards; the 

 cross-veins are near to each other; the apical part of the postical 

 vein somewhat suddenly thin ; a very thin anal vein indicated. Bal- 

 teres blackish. 



Female. Quite similar to the male; abdomen pointed. 



Length 1,5 — 1,7 mm. 



This little species resembles exilis, but is distinguished by the 

 almost hyaline wings, the cubital vein which is curved downwards 

 and not thin at the apex, and the distinct curve of the discai vein; 

 also the front coxæ are not yellow, at most a little paler at the 

 apex. 



D. pusilla is very rare in Denmark, only two specimens, a 

 male and a female, are known, one from Westermann's coUection, 

 labelled Copenhagen, and one taken on Langeland at Lohals on '"^h 1909 

 (the author). 



Geographical distribution: — Europe down into Italy; towards the 

 north to southern Sweden. 



21. Stilpon Loew. 



Very small species of partly dark, partly yellow colour. Head 

 about as broad as thorax, short but high, much higher than broad. 

 Occiput a little arched, with a few bristles above. Eyes large and 

 high; above they are well separated in both sexes, and they do not 

 go nearer to each other downwards, so that the frons has the same 

 breadth above and below and the margins are parallel; below the 

 antennæ the eyes are touching in both sexes, and the facets are 

 here a little enlarged likewise in both sexes. The hind margin of 

 the eyes are curved slightly forwards; the incision in the anterior 

 margin is distinct. The eyes are densely short-haired. On the vertex 



Vig. 118. Antenna of S. graminum. x 100, 



there are three ocelli and a couple (four) of ocellar bristles. The an- 

 tennæ are inserted near to each other a little below the middle; I 



