294 CASEY 



a little more coarsely but more sparsely on the first segment. 

 Length 6.2-7.6 mm. ; width 2.6-3.0 mm. Arizona (near the 

 southern boundary), — Morrison perforatum Csy. 



12 — Form strongly convex as in congruens iM\i\ perforatum 13 



Form very moderately convex 14 



13 — Form and habitus nearly as in perforatu7n^ with smaller head, 



less prominent basal angles of the prothorax and somewhat stouter 

 form, very convex, black, polished, the legs, antennre and under 

 surface dark rufous to piceous ; head but little more than half as 

 wide as the prothorax in either sex, nearly as in perforatum^ but 

 with the feebly converging sides before the eyes more arcuate ; 

 prothorax fully three-fourths wider than long in both sexes, nearly 

 as in peiforatum but with the coarse punctures generally sparser, 

 becoming rather more rapidly dense and coalescent near the sides ; 

 scutellum similar, moderate in size, punctured ; elytra nearly simi- 

 lar but rather shorter, with somewhat more arcuate sides, about 

 three times as long as the prothorax ; abdomen rather finely but 

 strongly, moderately closely and equally punctured medially 

 through the first three segments. Length 6.8-7.2 mm. ; width 

 2.7-3.1 mm. New Mexico (Deming), — H. F. Wickham. 



anceps n. sp. 



Form nearly as in the two preceding species but slightly less convex 

 and with a narrower prothorax, shining, dark piceous, the legs 

 and antennaj dark rufous; head well developed, three-fifths as 

 wide as the prothorax, broadly truncate, the sides rather strongly 

 converging and evenly arcuate before the eyes, with the angles 

 broadly rounded but somewhat evident, the punctures coarse but 

 smaller than in the two preceding species, unevenly close-set, the 

 occipital spot large though ill-defined ; prothorax rather more than 

 two-thirds wider than long, the sides evenly and rather strongly 

 arcuate, rather more converging and straight anteriorly, the basal 

 angles obtuse and not prominent, the punctures not very coarse 

 but strong and very sparse medially, becoming gradually much 

 coarser, dense and subcoalescent laterally ; scutellum rather small ; 

 elytra one-half longer than wide, not quite three times as long as 

 the prothorax, but slightly, though evidently, wider in the male, 

 the sides parallel and nearly straight, the apex obtusely ogival, the 

 punctures very coarse and serial laterally, the inner series feeble, 

 the interstitial punctures uniserial throughout except on the sutural 

 interval ; abdomen finely, sparsely punctured medially. Length 

 7.0mm.; width 2.9 mm. Arizona arizonicum n. sp. 



14 — Form oblong, parallel, much less convex than the preceding 



species, shining, dark piceous, the under surface, legs and antennai 

 rufous; head moderate, though evidently more than half as wide 

 as the prothorax in the male, the punctures coarse and unevenly 

 close-set, the occipital spot small and well defined, the sides con- 

 verging and strongly arcuate before the eyes, wholly obliterating the 

 angles; prothorax large, rather more than two-thirds wiiler than 



