64 H. C. FALL. 



The type is one of a series taken by Mr. Knaus at Deming, 

 New Mexico, where it has also been taken by Hubbard and 

 Schwarz; it also occurs at Alamogordo, New Mexico (Horn 

 coll.), at Glenwood Springs, Colorado (Fenyes coll.), and at 

 Ft. Grant, Arizona (National Mus. coll.). A series collected 

 by Prof. Snow in the Baboquivaria Mountains, southeastern 

 Arizona, and by Wickham at Nogales, Arizona, differs in 

 being brown in color and in having the thorax relatively a 

 trifle longer; this is a variation in the direction of carbonata, 

 but the claws are as in typical rufiola, of which it seems only 

 a variety. 



57. D. acerba n. sp. 



Rather stout, suboval, rufous to blackish brown, strongly shining, 

 alutaceous sculpture barely detectable. Mental ridge moderate. 

 Clypeal margin rounded, with very slight median sinuation or trun- 

 cation; clypeal suture moderately distinct; punctuation of head 

 moderately close but not crowded. Prothorax three-fifths wider than 

 long, widest at middle, sides moderately arcuate, angles obtuse, front 

 margin obviously bisinuate, punctuation coarser than in carbonata, 

 the punctures distant from a little less to a little more than their own 

 diameters. Elytra one-half wider than the prothorax, and about two 

 and two-thirds times as long; sides nearly parallel; punctuation coarse 

 and dense, the costae evident, all the intercostal spaces confusedly 

 punctate, the two outer ones much more broadly so than in carbonata. 

 Punctuation beneath moderately close laterally, quite coarse toward 

 the abdominal apex. Upper tooth of front tibiae a little post-median 

 in position. Ungual tooth strongly post-median, obliquely truncate, 

 the apex about twice as far from the base as from the point of the 

 claw. Length 6.5-7.5 mm.; width 3.7-4.2 mm. 



Described from a small series in the Horn and National 

 Museum collections. All specimens are labeled either "Tex- 

 as" or " S. W. Texas." 



This species is remarkable for the very coarse and close 

 punctuation of the elytra, they being quite as coarsely punc- 

 tate relatively as in punctipennu , which species, however, is 

 much larger and with more densely punctate thorax, the 

 latter also less strongly rounded at middle, and wider relative 

 to the elytral width. This latter distinction also holds in 

 comparison with all other related species. 



