1878.] 323 [Burgess. 



especially towards the tip. Veins brown, those bounding the distal 

 ends of the basal cells faintly clouded, as is, to a much less degree, 

 the posterior transverse vein. A long, brown, stigmatic cloud lies 

 under the end of the first longitudinal vein. 



One male, taken at Springfield, Mass., by Mr. George Dimmock. 

 Epibates Osten Sacken. 



This genus was established 1 for a number of singular species of 

 Bombylidse, especially characterized, in the males at least, by the 

 thorax being beset above with a number of sharp, rigid spine-like 

 points. Baron Osten Sacken recognized seven species, and I am now 

 able to add an eighth from the West. 

 Epibates Osten-Sackenii sp. nov. Plate 9, figs. 1, la. 



Deep black; thorax in certain lights with a metallic dark blue 

 lustre. First five segments of the abdomen margined behind with 

 white pile. Costal border of the wings, including first basal cell, 

 brown, small cross-vein continued upwards (apparently) by a black 

 streak. Second basal cell hyaline. Eyes (cf) not quite contiguous* 

 Long, corp., 14-16 mm. Long, al., 12-14 mm. 



Closely resembles E. magnus O.S., but differs by the gray, instead 

 of fulvous, hair on the occiput ; larger size ; the darker costal border 

 of the wings, which includes in E. Osten-Sackenii the submarginal cell ; 

 the presence of a dark brown streak running across the submarginal 

 cell, just above and appearing as a continuation of, the small cross- 

 vein ; 2 and finally in the white pile bordering the first five abdominal 

 segments. In E. magnus the white border is confined to the first 

 segment with a trace of white pile on the second. 



From E. marginalus, which has a fringe of pile on all the abdomi- 

 nal segments except the last, it is distinguished by the third joint of 

 the antennae being distinctly longer than the first, instead of the re- 

 verse, and its much larger size, 14-16 mm., instead of 8 mm. 



Three males in my collection, two taken in the summer of 1877 by 

 Mr. Morrison in southern Colorado, and one taken July 14, 18 77, 

 by Mr. Scudder inthe Upper Leavenworth Valley, above George- 

 town, Colorado, at an elevation of nearly 10,000 feet. 



I have also two fine specimens of E. muricatus O.S., taken by Mr. 

 Morrison in Colorado at a height of 9000 feet. The points on the 

 dorsum of the thorax are distinctly arranged in four longitudinal 



i Bull. U. S. Geol. and Geogr. Surv. Terr., in, No. 2, p. 268. 

 2 This streak is not sufficiently shown in the figure on Plate 9. 



