204 A. L. MELANDER. 



35. All the legs of nearly equal length ; hind femora much thickened. 



Pachyineria Stephens. 

 Hind legs longer than the others, their femora but little or not at all thick- 

 ened 36. 



36. Proboscis hanging downward or backward, and slender 37. 



Proboscis directed forward Iteapliila Zetterstedt. 



37. Face naked 38. 



Face provided with bristly hairs l^nipiuiorptaa Coquillett. 



38. Metallic species L<ain|>i*enipis Wheeler and Melander. 



Non-metallic species Enipis Linne. 



39. Antennae very shoi't, apparently two-jointed, the last joint ovate, with a 



short thick style Horniopeza Zetterstedt. 



Antennae formed otherwise 40. 



40. Proboscis shorter than the head ; fore metatarsi of the male not enlarged- .41. 

 Proboscis about as long as the head ; fore metatarsi more or less swollen in 



the male Hilaria Meigen. 



41. Arista short, two-jointed Rag^as Walker. 



Arista long, slender Gloina Meigen. 



TACHYDROMIINJ^. 



PHOSfEUTISCA Loew. 



" Phoneutisca differs from Tachypeza {%. e., Tachydromia) by the 

 sub-dorsal seta of the antennse, the apex of the second vein abruptly 

 recurved, so that the second half of the costa is shorter than the 

 third, the anterior femora less incrassate ; it is distinguished from 

 Drapetis by the straight narrower proboscis and the narrow elon- 

 gate palpi." Loew, Cent. Ill, 35. 



The hypopygium is not enlarged as in Stilpon. 



Legs and wings in part infuscated bimaciilata Loew. 



Legs yellowish, wings clear simplicior Wh. et M. 



Phoneutisca bimaculata Loew (Fig. 1). 

 Cent. Ill, 35. 



Black, shining, the elongate palpi and the halteres white, anterior knees 

 always and posterior tarsi at base often testaceous. Wings cinereous, with a 

 black costal spot surrounding the abruptly recurved end of the second vein, 

 veins fuscous, third and fourth veins close together and parallel. 2 mm. 



Alaska. 



Two males from Brookings, South Dakota (May), differ in having 

 the palpi black. The hypopygium, together with the abdomen, 

 forms a small club. There are no exposed parts to the hypopygium. 

 Viewed from behind the outline is an equilateral triangle, the base 

 above. 



