— 12 — 



1. — Front tibia- with terminal spurs; face without swelling in the middle (Dialysis 



Walk., teste Osten-Sackcn) Triptotricha. 



Front tibiae destitute of terminal spurs 2 



2. Third joint of antennae, round, oval, or pear-shaped, the bristle distinctly 



terminal 3 



Third joint kidney-shaped, arista more dorsal 5 



3. — Anal cell open Leptis. 



Anal cell closed i 



4. — 'J bird joint of antennas with a slender arcuate bristle Chrysopil°. 



Third joint with a shorter, slender style *Spa..la.*Ptioli' . 



5. Anal cell open Symphoromyia. 



Anal cell closed Atherix. 



Apatoiesles, n. g. 9- Head broad; eyes bare, elliptical, angulated 

 above. Front broad, its least width (at the vertex) about a third of 

 the length, below with a large, transverse, denuded callus. Ocelli 

 distinct. Antenna? situated below the middle of the head in pro- 

 file, short, small, first joint thickened, but little longer than broad; sec- 

 ond joint very short, simple; third joint twice as long as the first two 

 together, only a little thickened at the base, cylindrical, composed of 

 eight annuli, the first only a little longer than the following ones. Pro- 

 boscis short, scarcely extending beyond the tip of the palpi, the second 

 joint of the latter moderately tnickened. Abdomen a little wider than 

 the thorax, the sides nearly parallel to the tip of the fourth segment. 

 Legs simple, the front tibiae very slightly dilated, hind tibiae with spurs. 

 All the posterior cells open; anterior branch of third vein with a stump 

 near its origin. 



Apatolestes comastes, n. sp. 9- Black, thickly bluish gray pollinose. Front 

 -Inning black; face whitish gray; palpi light yellow; wings with stigmatic spot and 

 brownish spots on the cross veins; tibiae brownish yellow. Length II mm., of wings 

 9 mm. 



Front shining black, on each side of the ocelli faintly brownish pollinose, below the 

 callus, the first two antennal joints, and on the face densely nearly white pollinose; third 

 antennal joint black. Thorax nearly uniformly clothed with bluish gray pollen, thicker 

 on the pleurae; on the dorsum with sparse white pul>escence, the pleurae with moderately 

 abundant white pile; dorsum with three slender whitish stripes. Abdomen opaque 

 brownish black, the first segment and the posterior margins of the following segments 

 grayish and clothed with sparse wdiite hairs. Legs black, the tibiae brownish yellow : 

 front tarsi blackish, middle and hind pairs brown. Wings lightly infuscated, the 

 stigma and narrow clouds on the cross veins brownish. 



Two specimens. California. This species in size and general ap- 

 pearance resembles Tabanus pumihis Macq. 



Gen. nov. A female specimen of a species, yet unnamed, from Florida, 



