240 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



latter with scarce yellow pile; vertex black; proboscis not projecting; 

 antennae black, first joint reddish, with black pile. Thorax grayish- 

 black, clothed with pile, which is pale fulvous above and white on thepec* 

 tus and the lower part of the pleurae. Scutellum reddish, black at base; 

 ground-color of the abdomen is grayish-black ; in rubbed-off specimens, 

 only a little red is perceptible on the sides of the second and third seg- 

 ments ; in well preserved specimens, the ground-color is entirely con- 

 cealed under a dense, appressed tomentum, which is whitish-gray on the 

 anterior and brownish-fulvous on the posterior half of the segments ; an 

 ill defined blackish spot in the middle of each segment ; the sides of the 

 first two segments are beset with yellowish-white pile ; the sides of the 

 following segments, beginning with the end of the second, with black, 

 mixed with fulvous pile, the black forming tufts on the hind margins 

 of the segments ; the same black pile is scattered over the surface of the 

 abdomen, above the tomentum. Venter : segments 2-4 reddish, more or 

 less black at the base ; the following segments black, with a reddish 

 posterior margin. Legs red, with a golden-yellow tomentum and black 

 spines ; front femora black at base ; tips of tibiae and all the tarsi black. 

 Wings tinged with blackish-brown ; in the apical half, the following 

 spaces are grayish-hyaline : a spot in the expanded end of the marginal 

 cell, the end of the first submarginal and nearly the whole second submar- 

 ginal, a streak in the end of the first posterior cell, the three other pos- 

 terior cells, and the latter half of the discal cell ; the veins traversing 

 these subhyaline places are clouded with brown. The cross- vein bi- 

 secting the second submarginal cell is placed in its narrow part, so as 

 to form with the adjacent veins the figure A. 



Sab. — Cheyenne, Wyo., where I found it to be quite common, August 

 21, 1876. Five specimens. 



Six specimens which I took near Webber Lake, Sierra Nevada (July 

 25), agree in all respects with those from Cheyenne ; but they are a little 

 smaller, the coloring is a little darker, both on the wings and on the 

 body ; the pile on the chest and pleurae is less white ; the tomentum on 

 the abdomen above is the same, but the fulvous prevails over the gray, 

 and the black spots in the middle of each segment are larger; on the 

 second segment, along the hind margin, the black forms a cross-band, 

 attenuated on each side, and not reaching the lateral margin ; the same 

 is repeated on each following segment, the black spot rapidly diminish- 

 ing in extent. The venter is reddish, without any black at the base of 

 the segments. The portion of the anterior branch of the third vein 

 beyond the supernumerary cross- vein is very distinctly clouded with 

 brown in these specimens, while it is not clouded at all, or only imper- 

 ceptibly, in the specimens from Cheyenne. I hold this to be merely a 

 local variety of A. alpha. 



Anthrax lucifer F. — Hitherto known only from the W T est Indies. I 

 liave several specimens from Dallas, Tex. (Boll), which seem to belong 

 kere. 



