BOMRYLIIDtE. 67 



27. Anal cell open. .......... ;jO 



Anal cell closed 28 



28. Proboscis sliort. ...... OxconoCKR.v Macquart. 



l'rol>oscis elongate. ......... 29 



29. Third joint of the antenna; with long liristly hairs ; face with long hair. 



AciiEOTRU'iius Macquart. 

 Third joint of the antenna; without or with short bristly hairs above; 



face bare or shortly pilose Piithiria Meigen. 



"0. Body clothed with more scales than hairs, gibbose; antenna; long, the 



first joint unusually long. . . . Lepidoi'iioha Westwood. 



Body clothed chiefly with hair, or else ncarl\- bare. ... 31 



ol. Body more or less pilose; tibia; usually bristly. . . . 32 



Body bare; tibiae bare or feebly liristly 37 



32. ]5oth basal cells of equal length. . . RpARNoroLius Loew. 



First basal coll longer than the second 33 



3;;. '{'bird antennal joint but little longer tlian the first; mesonotunt of 

 male sometimes muriacate and the costa denticulate. Eclimus Loew. 

 Tliird joint of the antennic more than twice the length of the first, bul- 

 bous at the base. ......... 34 



34. The origin of the second vein takes place before the proximal end of 



the discal cell at an acute angle. ...... 3u 



The origin of the second vein is lieyoiid the proximal end of the discal 

 cell and is rectangular. . . Desmatonkura Williston. 



35. Third antennal joint scarcely longer than wide. Eucessia Coquillett. 

 Tliii'd anteimal joint much loiigiT than wide. .... 3(; 



3(i. Face projecting in profile Epacmiis (^sten Sacken. 



Face retreating. Apikebantu.s Loew. 



37. Ocellar tubercle situated near the hind edge of the front. . . 38 

 Ocellar tubercle situated near the middle of the front. 



Metacosmts Coquillett. 

 3,8. Antenna; elongate, third joint llattciied, the style flattened and com- 

 posed of two distinct segments. . . Desmato.mvia Williston. 

 Antenna; not elongated and with a distinct bisegmentnted style. 



Taracosmis ( )sten Sacken. 



39. Sleiuler, elongate si)ecies. . . . . . . . . K) 



Shorter, more thick-set species, the abdomen never (cylindrical. 41 



40. Females holoptic like tiie males; abdomen enlarged at its extrendty. 



SvsTRoi't's Wiedemann. 

 Females dichoptic; abdomen cylindrical, not enlarged at the extremity. 



Doi.iciioM'i lA Wiedemann. 



