236 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



they are all less extended and weakened in intensity of color ; the whole 

 first basal and the proximal end of the first posterior cell are not brown, 

 but yellowish, which color is interrupted by a brown cloud on the 

 small cross-vein, and ends in a brown cloud in the middle of the first 

 posterior cell ; the brown band across the middle of the marginal and 

 first submarginal cells is narrower; that running obliquely from the 

 discal to the axillary cell is likewise narrow, almost dissolved in its com- 

 ponent spots. I am inclined to believe, nevertheless, that it is the same 

 species. 



12. ExoPROSOPA AGASSizi Locw, Centur., viii, 24. — California. Must 

 be somewhat like E. doris; nevertheless, a different species. 



13. ExoPROSOPA BiFURCA Loew, Centur., viii, 23. — California. I do 

 not know it. 



14. EXOPROSOPA EREMITA n. sp. — Wings brown at base, the brown en- 

 croaching a little beyond the basal cross-veins, and with two broad brown 

 cross-bands ; the first is limited anteriorly by the prtefarca and ends in 

 the distal half of the axillary cell, where a very narrow hyaline space 

 separates its end from the margin of the wing ; the second starts from 

 the anterior margin in the region of the stigma, and, attenuated poste- 

 riorly, stops short before crossing the third posterior cell ; the yellowish- 

 brown costal cell forms the only connection between those three regions 

 of brown, the hyaline intervals between which are almost broader 

 than the brown cross-bands ; apex of the wing and posterior margin 

 likewise hyaline. Front and vertex black, beset with yellowish pile; 

 epistoma brownish-red ; antennae black, third joint conical, with a style 

 about one-tliird as long as the joint. Proboscis hardly projecting. 

 Thorax grayish-black, beset with yellowish pile ; antescutellar callosities 

 brownish ; scutellum reddish-brown, black at base. Ground-color of the 

 abdomen black, with red sides; second segment with a white cross-band 

 at the base; white spots on each side of the third, and interrupted cross- 

 bands on the fourth and fifth ; sixth segment also whitish ; yellow pile 

 on the sides of the abdomen, at the base, and black ])ile beyond the end 

 of the second segment. Venter red, with traces of a covering of white 

 scales on segments 2-4. Legs dark reddish-brown, with black pile. 

 Length IG'"'". 



Eab. — Shasta district, California (H. Edwards). A single specimen. 

 Its epistoma and abdomen were somewhat denuded. 



DiPALTA nov. gen. 



Differs from Exoprosopa in the course of tjie second vein, which is 

 strongly contorted, in the shape of a recumbent S, near its point of con- 

 tact with the cross- vein, which separates the first submarginal cell from 

 the second. 



A still more important difference lies in the structure of the antennte, 

 the third joint of which does not bear the terminal style, so apparent in 

 Exoj)rosopa^ and is more like that of the genus Anthrax. Examined 



