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 Loew, 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 eremit a 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 prsefurca 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-third 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 pile beyond the end 

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

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

 Length 16 mm . 



Hab. — 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 the 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 antennae, 

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

 Exoprosopa, and is more like that of the genus Anthrax. Examined 



