460 AMERICAN PACHYBRACHYS (cOLEOPTERA) 



seen, in lacking entirely the intrahumeral yellow spot, and in 

 having the legs brownish piceous with the front tibiae and parts 

 of the front femora paler. The median line is more distinctly 

 impressed toward the vertex of the head than in difficilis, as a rule. 

 Distribution.— Utah: Wahsatch Mountains, June 27 (Hubbard & Schwarz), 

 taken abundantly; type d^. Montana: Kalispell (Wickham). W{ashington) 

 T{erritory): (Hubbard & Schwarz). 



The typical form autolycus goes generally as litigiosus in col- 

 lections, but the latter is an Atlantic Coast species, distinctly 

 different by its generally longer, more sparsely punctured and 

 more conspicuously alutaceous prothorax. The darker forms, 

 including difficilis, have also generally gone as litigiosus var. and 

 were so held by LeConte, who by the way attached his litigiosus 

 label to a western specimen of autolycus rather than to the true 

 litigiosus. 



Through those examples of autolycus with strongly transverse 

 prothorax with substrigose lateral punctuation this species ap- 

 proaches othonus, and through ivahsatchensis it approaches nigri- 

 cornis; indeed it is far from unlikely that both ivahsatchensis and 

 difficilis are the more usual forms of the rare nigricornis; in which 

 case autolycus would have to follow unless some one shall prove 

 more successful than I have been in finding a dividing line. 

 142. Pachybrachys nigricornis Say 



Black, prothorax and elytra obscurely margined with rufous, 

 the latter also with a more or less obscure and imperfect subsu- 

 tural Hne of same color; integuments strongly shining, the head 

 only, very minutely alutaceous, the elytral interspaces finely 

 transversely wrinkled; eyes rather small and very widely sepa- 

 rated, no ocular lines; elytra regularly striate; front claws of 

 male small. Ave. length 3.2 mm. Kansas, Colorado. 



Head sparsely finely punctured on the vertex, the front more coarsely and 

 closely so, especially in the median impression; eyes separated by slightly {&) 

 or distinctly ( 9 ) more than their own vertical length. Antennae black, rufous 

 toward the base, not very slender, only about half as long as the body in the 

 female, tenth joint two and one-half times as long as wide or a little more in 

 the male, twice as long as wide in the female. 



Prothorax only moderately transverse, sides distinctly convergent in front, 

 rather strongly rounded posteriorly in the male, less dilated and feebly arcuate 

 in the female, rather coarsely moderately closely punctured, the side margins 

 narrowly smooth. 



Elytra regularly striate, the striae moderately impressed, more distinctly so 



