458 AMERICAN PACHYBRACHYS (cOLEOPTERA) 



Prothomx broad, strongly rounded or subinflated behind (cf), strongly 

 narrowed in front; punctures close, rather coarse, elongate, with a tendency 

 toward strigosity laterally; pale lateral margin narrow, sparsely punctured. 



Elytral punctures arranged in moderately impressed regular striae except in 

 a narrow baso-sutural region, interspaces minutely wrinkled, moderately 

 shining; eighth stria not interrupted near the base, marginal interspace impunc- 

 tate. 



Pygidium, body beneath, and legs black. 



Length 3.5 to 3.8 mm.; width 2 to 2. 2. mm. 



Distribution. — Indiana: Marshall Co., June 24 (type — elegans Blatchley). 

 Illinois: (LeConte Coll.); N. lU., June 14 (Am. Ent. Soc. Coll.). South 

 Dakota: Black Hills, June 24 (Nat. Mus. Coll.). Manitoba: Wiimipeg, June 

 24 (Wallis). California: One example so labeled in the LeConte Coll., perhaps 

 in error. 



The pale elytral margin involves the upper part of the epipleural 

 lobe, the marginal (ninth) interspace, and sometimes the posterior 

 part of the eighth interspace; in some examples in the LeConte 

 Collection it is entirely lacking. 



This species is most nearly allied to certain forms of autolycus, 

 having a somewhat similar prothoracic punctuation. It is thus 

 far extremely rare. 

 141. Pachybrachys autolycus new species 



Yellow, moderately to rather strongly shining; prothorax with 

 moderate to broad sharply defined black M, the lateral vittae 

 rarely disconnected from the median one; elytra each with two 

 discal vittae and the suture black, varying to black with sub- 

 sutural vitta and margin yellow (vars difficilis and wahsatchensis) . 

 Eyes very distant, front without ocular lines; front claws of male 

 not enlarged. Ave. length 3.2 mm. Maine to Washington 

 State and Arizona. 



Head not at all wider than the thoracic apex, front rather closely punctate 

 medially, more sparsely so toward the vertex, surface finely alutaceousbut 

 moderately shining, black markings usually broad and sharply defined. Eyes 

 separated by nearly three times the length of the basal antennal joint or by 

 fully their own vertical length in the male, a little more distant in the female. 

 Antennae black, more or less yellow basally, of moderate length, tenth joint 

 two and one-half to two and three-fourths times as long as wide. 



Prothorax moderately (cf ) to strongly transverse, sides variably rounded, 

 evidently convergent in front, surface either moderately shining and finely 

 alutaceous throughout, or more strongly shining with very fine alutaceous 

 sculpture only detectable toward tlie sides; punctuation moderately close 

 medially, closer toward the sides, where the punctures are often more elongate 

 with a tendency toward strigosity; lateral margins narrowly smooth. 



