H. C. FALL. 183 



three joints paler below, piceous above, the fourth one-half longer 

 than, and nearly twice as wide as the third. The eyes are widely sepa- 

 rated, the front feebly obtusely prominent and impunctate along the 

 median line. Length, 2.3 mm. ; width, 1.35 mm. 



Los Vegas Hot Springs, N. Mex. (Barber and Schwarz). 



With the male type I have placed a smaller female speci- 

 men from the same locality, which from its association prob- 

 ably belongs here, but is not different apparently from ordi- 

 nary aureohis. 



B. subserripes n. sp. 



Moderately robust, form nearly as in fraterculus , black, uniformly, 

 moderately densely cinereo-pubescent. Antennae (c?) long and stout, 

 reaching the middle of the elytra ; basal four joints piceous, paler 

 beneath, together but little longer than the fifth ; second obconical, 

 about as wide as long, third a little transverse, fourth very short and 

 strongly transverse, fifth abruptly, very much larger, about as wide as 

 long, 6-10 similar, subequal or slightly decreasing in width, subserrate. 

 Eyes moderate, emarginate for two-thirds their length, separated by 

 fully their own width. Head finely, closely punctate and dull. Pro- 

 thorax conical, a little transverse, sides nearly straight, surface coarsely 

 rather densely punctate. Scutellum slightly elongate, emarginate at 

 tip, more densely pubescent. Elytra as wide as long, finely striate, 

 intervals finely rugosely punctate. Pygidium a little more densely 

 pubescent, subvertical, convex, moderately coarsely, but not deeply 

 punctate. Hind femora thick, armed near the knee with an acute 

 tooth and two somewhat distant denticles, and also on the inside, near 

 the middle of the lower margin a series of three distant, small, acute 

 teeth, directed backward. Apical spur of hind tibia slender and about 

 one-third as long as the first tarsal joint. The female differs from the 

 male only in the shorter antennas, which are less dilated and more 

 feebly serrate externally. Length, 1.75-2.5 mm. ; width, 1.15-1.35 mm. 



Ysleta, Texas. 



This species is quite similar in appearance to fraterculus, 

 but differs from it in the longer and stouter male antennae, 

 and from all species known to me except musculus, by the 

 small acute teeth at the lower margin of the hind femora. 



B. fumatus Schf. 



In a male of this species, sent me by Mr. Schaeffer, there 

 appears to be on the first ventral a very small, feebly im- 

 pressed fovea, which is more finely, densely sculptured and 

 pubescent ; there is, however, no apparent flattening of the 

 segment, nor any trace of the longer hairs which are present 

 in aureohis and several allied species. 



TRANS. AM. BNT. SOC, XXXVI. JULY, 1910. 



