201 



30. Large, elongate species, the style of antennae short. Callinicus. 

 Moderately large, not markedly elongate species. . , 31 



31. Abdomen broader at base, depressed; thorax often strongly con- 



vex above, antennae slender, the style long and slender (com- 

 pare also species of Cyrtopogon and Metapogon] . 



Heteropogon. 

 Abdomen short, cylindrical; black, with bright golden, opaque 



pollinose markings on thorax and abdomen (39) . 



Chrysoceria. 



32. Face bare, with bristles on oral margin, in profile straight or gen- 



tly concave, the oral margin most prominent. . . . 33 



Face convex below, the oral margin not the most prominent, more 



or less covered with hair. ....... 35 



33. Fourth posterior cell closed a considerable distance before the 



margin of the wing; antennae without style. ... 34 

 Fourth posterior cell open or closed in the margin. Saropogon. 



34. Posterior pulvilli much shorter than the elongated claws; abdomen 



contracted toward the base (13)*. . . Blepharepium. 



Posterior pulvilli not much shorter than the claws; abdomen not 



contracted toward the baset (14,15). . . Deromyia. 



35. Third joint of the antennae more or less dilated, the style very 



short (16). Lestomyia. 



Third joint of antennae slender, elongate. .... 36 



36. Head broad and flat, the face not gibbous. .... 37 



Face convex, densely covered with hair; thickly hairy species. 



Lastaurus. 



37. Third joint of the antennae with an excision on the upper border 



before the tip, bearing a small spine; abdomen punctulate (17, 



18) (Dioctrodes Coq.) Taracticus.J 



Third antennal joint with a small terminal style; abdomen smooth, 

 not punctulate. ......... 38 



38. Abdomen flattened, in the male a little broader beyond the mid- 



dle; in the male near the tip, the last two segments conspicu- 

 ously silvery above (2O). ..... Nicocles. 



Abdomen of male not flattened and silvery distally (19) . 



Cophura. 



* If abdomen not contracted toward the base, the scutellum w 7 ith 

 bristles, Allopogon, S. Amer. 



t If abdomen contracted toward the base, the scutellum without 

 bristles Senobasis (Lochites], S. Amer. 



+ T. vitnpennis and T. mger, with a large two-jointed style, and 

 without lateral spine, must be separated generically. 



20 



