NoKTii Ameiucan Du'tkua. 53 



00. Face produced forward, pointed, concave from antenna^ to tip, 

 not tuberculate, sub-carinate ; hind femora tliickened. 



Ckioi'uora 

 Face not evenly concave, tuberculate or convex. . . 61 



61. Third joint of antenna; produced above into a conical process, 



terminating in the thickened arista. . . Mkhapioides 



Third joint of antenna; obliquely oval ; hind femora rarely 



thickened.* Ckioiuuiina 



62. Hind femora with a conical, tooth-like protuberance below, near 



the distal end Spilomyia 



Hind femora without such protuberance. ... 63 



63. Antennie inserted low down, near the middle of the head in pro- 



file ; face not longer than the front. . . Temnostoma 

 Antennte situated high up, on a conical jirocess, front short, 

 face much produced downward; antennae long or short. 



Sphecomvia 



Lepidostola Mik, Wien. Ent. Zeit. V. 278, 1880. 



(Lepidomyia Loew, Lepromyia Will.) 

 Hammekschjudtia Sclmmmel, Okcn's Isis, 1834, p. 740. 



(Exochila Kond., Eugeniamyia Will.) 

 (For descriptions of genera and species, see Willistou, Synopsis, etc. 

 Bull. U. S. National Museum No. 31, 188G[7].) 



CONOPID^. 



Thinly pilose or nearly bare, more or less elongated species. 

 Head broad ; front broad in both sexes ; ocelli present or absent. 

 Antenna; porrect, composed of three simple joints, the third with a 

 dorsal arista or terminal style Oral opening large ; proboscis slen- 

 der. Abdomen more or less elongated, often constricted toward the 

 base. Basal cells of wing usually large, the third (anal) closed; three 

 posterior cells, the first closed or much narrowed ; no spurious vein. 



Flower flies. Larva; parasitic upon h^menoptcra and orthoptera. 

 Pupse enclosed in larval skin (cyclorrhapha). 



1. Antenna; with a terminal style ; proboscis directed forward, with- 

 out medium hinge ; abdomen constricted toward the base. 2 



* If thinly pilose, with the abdomen nearly bare, and the hind femora 

 thickened, see Xylota tuberans. 



