262 ENTOMOLOGICAL SOCIETY 



41. Veins two and three sinuous, wings grayish, marked with hyaline 



dots Dolichocephala Macq. 



Veins not sinuous, wings never marked in this manner 42 



42. Face bare ... 43 



Face hairy, the sides separated by a groove from the narrow cheekvS, 



hind crossvein very angular, lower inner corner of third posterior 

 cell acute Koivarzia Mik. 



43. Body usually opaque, under side of middle and hind femora at most 



with a preapical bristle 44 



Body polished, middle or hind femora usually bearing several bristles 

 on the under side Brachystoma Meig. 



44. Hind crossvein nearly straight and perpendicular, lower inner angle 



of third posterior cell almost rectangular, sides of face separated by 



grooves from the very narrow cheeks 45 



Hind crossvein very angular, or very oblique, lower inner angle of 

 third posterior cell acute 47 



45. Pulvilli and empodia well developed, scutellum bare except the mar 



ginal pair of bristles 46 



Pulvilli and empodia rudimentary, scutellum bearing more than a pair 

 of marginal bristles. Bergenstammia Mik. 



46. Stigma wanting , -. Hydrodromia Macq. 



Stigma distinct Phaobalia Mik. 



47. Empodia and pulvilli well developed 48 



Empodia and pulvilli rudimentary, sides efface separated by grooves 



from the narrow cheeks, scutellum bare except for the pair of mar- 

 - ginal bristles , Lamposoma Beck. 



48. Wings having the narrow stigma situated nearer to first vein than to 



apex of second, or wanting 49 



Wings having the rounded stigma situated nearer to apex of second 

 vein than to the first, scutellum bearing several short bristles besides 

 the long marginal pair, sides efface not separated by grooves from 

 the broad cheeks Wiedematinia Zett. 



49. Femora without preapical bristles 50 



Femora with a pair of such bristles, scutellum bearing short bristles 



besides the marginal pair, sides of face not separated by grooves 

 from the broad cheeks Ettcelidia Mik. 



50. Sides of face not separated by grooves from the broad cheeks 51 



Sides of face separated by grooves from the narrow cheeks, scutellum 



bearing a marginal pair of bristles, otherwise bare. Clinocera Meig. 



51. Scutellum bearing a pair of marginal bristles, otherwise bare, short 



bristles in the dorsocentral rows on the \hor&x...Ckamadipsia Mik. 

 Scutellum bearing short bristles in addition to the marginal pair, 



Roderia Mik. 



52. Arista slender, bristle-like 53 



Arista thick, style-like, proboscis thick, horizontal, anal cell shorter 



than the second basal Oreogeton Schin. 



