8 Orthonhapha brachycera. 



unforked; metapleura bare or with very short hairs; 



thorax rather high and arched 4. 



— Proboscis longer, as long as or generally longer than 

 the head, directed downwards; cubital vein forked 

 or unforked, in the latter case the metapleura with 



bristles; thorax less high and arched 2. Empidinae. 



4. Anal cell shorter than or about as long as the se- 



cond basal cell; discai cell present 3. Ocydromiinae. 



— Anal cell longer than the second basal cell or when 



shorter no discai cell 1 . Hybotinae. 



1. Hybotinae. 



Eyes touching in both sexes, the facets in the upper part of the 

 eye larger than below. Antennæ three- or five-jointed , terminating 

 with an arista. Proboscis short. Maxillæ not present, maxillary palpi 

 one-jointed. Thorax very high. Metapleura bare. Cubital vein unforked ; 

 discai vein forked or unforked, three or four posterior cells; discai 

 cell present, sending two veins to the margin, or absent. Basal cells 

 of equal length or the second longer than the first; anal cell longer 

 or shorter than the second basal cell; anal vein reaching the margin. 

 Axillary lobe somewhat developed or large. Alula wanting or {Bicel- 

 laria) small. Stigma present or absent. 



Tahle of Genera. 



1. Antennæ three-jointed ; discai cell present 1. Hyhos. 



— Antennæ five-jointed ; discai cell absent 2. 



2. Discai vein not forked; the anal cell longer than the 



second basal cell; stigma present 2. Microsania. 



— Discai vein forked (the fork generally not quite complete) ; 



the anal cell shorter than the second basal cell; no stigma 3. Bicellaria. 



1. Hybos xVIeig. 



Species of medium size and a slender shape, and of dark, 

 blackish colours. Head somewhat small, nearly globular, slightly 

 arched behind and here with some hairs. The eyes are very large, 

 occupying the whole front side of the head, of reddish brown colour; 

 they are touching in both sexes for a long distance, quite from the 

 antennæ to the vertex, so that there is no frons developed ; the facets 

 in the upper half are in both sexes longer than below, and there is 

 a distinct, impressed dividing line between the upper and the lower 

 part. The large facets decrease in size towards the dividing line. The 

 incision in the inner eye-margin distinct. There is a small, prominent 

 vertex with three ocelli and some small bristles. The antennæ are 



