184 Orthorrhapha brachycera. 



Metapleura bare or with short hairs. Cubital vein unforked; discai 

 vein forked, or {Ocydromia, Leptopeza) unforked; a discai cell present, 

 sending three or two veins to the margin; three or four posterior 

 cells; the basal cells of equal length; the anal cell shorter than or as 

 long as the second basal cell; the lower branch of the postical vein 

 recurrent, or meeting the anal vein at a right angle; anal vein short, 

 or longer and reaching the margin. Axillary lobe large (except in 

 Leptopeza sphenoptera). Alula very small or wanting. Stigma present; 

 sometimes {Leptopeza) absent. 



Tahle of Genera. 



1. Antennæ with the third joint more or less elongated, 

 terminating with a short style; discal vein forked 2. 



— Antennæ with the third joint short, terminating with a 



long arista; discal vein unforked 5. 



2. Antennæ long, longer than the head, third joint much 

 elongated; hind femora thickened, with spines below. . 9. Oedalea. 



— Antennæ shorter, at most as long as the head, third 

 joint less elongated; hind femora not thickened, with- 



out spines below 3. 



3. Antennæ short, the style very short; proboscis about 

 as long as the head, or longer, directed straightly or 

 obliquely forwards; anal cell considerably shorter than 



the second basal cell 12. Etdhyneura. 



— Antennæ longer, the style somewhat long; proboscis 



very short, directed downwards 4. 



4. Basal cells somewhat large, anal cell shorter than the 



second basal cell, anal vein long, reaching the margin 7. Trichina. 



— Basal cells small, anal cell about as long as the second 



basal cell, anal vein not prolonged beyond the anal cell 8. Microphorus. 



5. Third antennal joint short, ovate^ arista inserted in its 



upper margin 10. Ocydromia. 



— Third antennal joint longer, conical, arista terminal .. 11. Leptopeza. 



7. Triehina Meig. 



Species of small size and of dark colours. The head is globular, 

 somewhat arched behind, as broad as thorax. OccipuL somewhat 

 haired. Eyes large, occupying the whole front side of the head ; they 

 are touching in the male, and in the female either also touching, but 

 for a shorter distance, or they are in this sex narrowly separated, 

 leaving a very narrow frontal stripe between them. In the male the 

 facets are larger in about the upper half, the dividing line is sharp; 

 when the eyes are touching in the female, the facets are large in a 

 small upper part, when they are separated all facets are small. The 

 incisure in the middle of the inner eye-margin is distinct, There are 



