BOMBYLIIDJE. 67 



27. Anal cell open ^ . 30 



Anal cell closed 28 



28. Proboscis short ONCODOCERA Macquart. 



Proboscis elongate . . 29 



29. Third joint of the antennas with long bristly hairs ; face with long hair. 



ACREOTRICHUS Macquart. 



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

 face bare or shortly pilose. . . . . PHTHIRIA Meigen. 



30. Body clothed with more scales than hairs, gibbose; antennae long, the 



first joint unusually long. . . . LEPIDOPHORA Westwood. 



Body clothed chiefly with hair, or else nearly bare. 31 



81. Body more or less pilose; tibiae usually bristly. ... 32 



Body bare ; tibiae bare or feebly bristly 37 



32. Both basal cells of equal length. . . . SPARNOPOLIUS Loew. 

 First basal cell longer than the second. ..... 33 



33. Third antennal joint but little longer than the first; mesonotum of 



male sometimes tnuriacate and the costa denticulate. ECLIMUS Loew. 

 Third joint of the antennae 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. ...... 35 



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

 cell and is rectangular. . , . DESMATOXEURA Williston. 



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

 Third antennal joint much longer than wide. .... 30 



36. Face projecting in profile. . . . . EpACMrsOsten Sacken. 

 Face retreating. . . . . ; APHCEBAXTUS Loew. 



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

 Ocellar tubercle situated near the middle of the front. 



METACOSMUS Coquillett. 



38. Antennae elongate, third joint flattened, the style flattened and com- 



posed of two distinct segments. . . DKSMATOMYIA Williston. 

 Antennas not elongated and with a distinct bisegmentated style. 



PARACOSMUS Osten Sacken. 



39. Slender, elongate species . . 40 



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



40. Females holoptic like the males ; abdomen enlarged at its extremity. 



SYSTROPUS Wiedemann. 



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



DOMCHOMYIA Wiedemann. 



