180 NORTH AMKRICAN 



much more than twice as long as the second, club fully as long as the first 

 two joints togetiier. Prothorax widest at two-fifths its length from the base 

 where it is slightly more than twice as wide as long ; sides almost equally 

 convergent anteriorly and posteriorly, very feebly sinuate in the former, 

 straight in the latter sense ; apex slightly shorter than the base, broadly 

 and feebly emarginate ; base broadly arcuate ; apical angles acute and not 

 at all rounded, posterior obtuse and very slightly rounded ; disk moderately 

 convex, very coarsely aifd somewhat irregularly punctate, punctures deeply 

 impressed and generally separated by two to three times their own widths. 

 Scutellum small, scarcely longer than wide, narrowly rounded behind. 

 Elytra at base as wide as the pronotura, widest at two-thirds the length 

 from the base where they are nearly one-fourth wider; sides straight; disk 

 abruptly and very broadly rounded behind, scarcely more than one-third 

 longer than wide, convex, very coarsely and deeply punctate ; punctures 

 round, deeply impressed, arranged in widely distant double or triple rows, 

 the intervals being irregularly punctate; between the clearly defined sutural 

 row and the suture there is a row of more widely distant punctures. Abdo- 

 men rather finely sparsely and evenly punctate throughout ; pygidium 

 entirely exposed, slightly wider than long, parabolically rounded beneath, 

 surface coarsely and rather closely punctate, fringed beneath with a dense 

 line of short yellowish setae. Legs rather long and slender ; tibiae having 

 a cluster of teeth just beyond the middle exteriorly ; first and second joints 

 of the posterior tarsi equal in length, the former much more robust and 

 clavate ; claws strongly compressed, wide, sides nearly parallel, cleft at tip, 

 notch slightly more than one-fourth as long as the claw, inner tooth much 

 more robust than the outer. In the male tlie outer tooth is longer and more 

 slender. Length 8.5-9.5 mm. ; width 4.0-5.0 mm. 



Arizona (Morrison), 2. 



Tliis species should apparently be placed in a distinct subgenus 

 together with LeConte's pithenihts from the same region, not only 

 on account of the claws rather cleft at tip than properly toothed, and 

 the hairy vestiture, but more especially because of the prominent 

 anterior angles of the clypeus, and the deeply sinuate or bilohed 

 labrum. 



AXOillALA Sam. 



• 



In looking over Dr. Horn's revision of the American species of 

 this genus. I find that this author combines htteipennis Lee. and 

 binofata Gyll. As I have very good sets of each of these foruis before 

 me I feel prepared to maintain their specific distinctness. They differ 

 in the following characters, which are independent of sex : — 



In iiiteipenuis the form of the body is more robust and the pronotum 

 is proportionally much wider, the sculpture of the head and pronotum 

 is coarser while that of the elytra is finer, the last joint of the maxil- 

 lary palpi is very noticeably shorter and stouter, and the last joint of 



