4 S. W. WILLISTON. M. I). 



Less thickly poUinose; abdomen cylindriciil, a little broader at base: third 



joint of antennae short, broad, style minute ? HabropogOil. 



25.— Large, elongate species, style of antennae short Calliiiicus. 



Moderately large, not rnuch elongate 26. 



26.— Abdomen broader at the base, depressed ; thorax much convex above, anten- 

 na slender, style long and slender (compare species of Cyrtopogon). 



Anisopogon. 



Abdomen short, cylindrical, antennae moderately long, style short. Black 



with bright golden yellow opaque pollinose markings on thorax and 



abdomen "liRparus?" (pictitarsis Big.) 



27.— Large species; face bare with bristles on the oral margin, in profile straight 



or concave, the oral margin projecting 28. 



Smaller species; face convex on lower portion, not projecting 29. 



28.— Elongate ; fourth posterior cell closed, usually a considerable distance before 



the margin Deromyia. 



Less elongate; fourth cell open or closed in the margin, rarely a little 



petiolate Saropogoii. 



29.— Head broad and flat, face not gibbose, third joint of antenna; slender, 



elongate 30. 



Head only moderately broader than high ; face gibbose below; third joint of 

 antennae more or less dilated, style very short ; thorax and legs with numer- 

 ous bristles; abdomen broadest at the base, rather slender, subeylindrical. 



Liestomyia n. g. 

 30. —Abdomen finely punctulate, of nearly equal width, hind tibiw at the tip and 



their tarsi only a little thickened; wings hyaline Taracticiis. 



Abdomen smooth ; hind tibiae at their tip and their tarsi thickened (compare 

 here Nicocles f .icitula) ; antennal style slender, acuminate ; wings varie- 

 gated •'^l- 



31.— Abdomen flattened ; in the female a little broader beyond the middle; in the 

 male near the tip, the last two segments of which conspicuously silvery. 



Sficocles. 



Abdomen of nearly equal width throughout, the last segment in the male not 



silvery, fourth posterior cell narrowed Blacodes. 



B. 



Laphrinae. — Marginal cell of the wing closed, antennae without a 

 terminal bristle. 

 1. — The veins at the distal ends of the discal and fourth posterior cells in the same 



straight line, continuoivs, or nearly so 2. 



The veins, etc., not in the same straight line, the vein closing the fourth pos- 

 terior cell more or less remote and oblique .3. 



2. — First joint of antennae elongate, slender ; second posterior cell narrowed 



toward the margin of the wing Cerotainia. 



First joint of the antennae much shorter than the third : first posterior cell 



narrowed or closed, the second wide open Atoinosia. 



.3. — First posterior cell narrowed or closed 4. 



First posterior cell wide open 6. 



4. — Three submarginal cells, i. e. the upper branch of the third vein is connected 



with the second by a short vein PogOUOSonia. 



Two submarginal cells 5. 



