H2 MEMOIRS ON THE COLEOPTERA 



humeri slightly evident, the feeble inner costa distinct and joining 

 the outer near apical fifth, the rugae numerous, close-set and strongly 

 shining, the interspaces not so densely opaque as in snowi, nearly 

 smooth; abdomen opaque, nearly similar. Length (cf ) 15.0 mm.; 

 width 6.5 mm. Arizona (San Bernardino Ranch, Cochise Co., 

 3750 feet), E. G. Smyth subtenuis n. sp. 



The species described under the name morbillosus, by LeConte, 

 is generally identified as any one of the forms from corporalis to 

 subtenuis in the above table. I have selected to represent that local 

 Sonoran species, a specimen of rather large size and deep black 

 opaque integuments, with rather fine, tortuous and widely separated 

 rugae, collected by Prof. Snow in the Baboquivari Mts.; it has a 

 very distinct and broadly subangulate sinus opposite the scutellum. 

 These numerous allies of morbillosus are all built upon the same plan, 

 presenting very few diversities of structure and are therefore difficult 

 to define recognizably, though readily separable on sight. 



Group II Type carinatus Lee. 



Basal angles of the prothorax more or less briefly, obliquely prominent 



and acute 2 



Basal angles right, not rounded but not at all prominent 3 



2 Body stout, convex, deep black, subopaque throughout, the elytra 

 alutaceous; head feebly impressed, finely and sparsely punctate, 

 the minute hairs erect, dark and indistinct; prothorax very nearly 

 as long as wide, parallel, widest slightly before the middle, the sides 

 evenly and moderately arcuate, becoming slightly sinuate very 

 near the basal angles; base transverse, slightly sinuate near the angles; 

 surface convex and longitudinally, sharply crested medially, the 

 crest obsolete basally, rather abruptly, feebly reflexed at the sides, 

 the punctures small and separated anteriorly, large and coalescent 

 basally, equal but rather coarse and contiguous laterally, the reflexed 

 edge impunctate but granulate and plicate, very thick, feebly crenu- 

 late; elytra two-thirds (cf) to four-fifths (9) wider than the pro- 

 thorax, fully one-half longer than wide, evenly oval, widest at the 

 middle, deeply constricted just behind the basal margin, the ends of 

 which are laterally prominent but not very acute, not so strongly 

 as in the morbillosus section ; surface evenly convex, finely and feebly, 

 transversely rugulose, the outer costa feeble, the inner almost to 

 quite obsolete, the former extending only to the summit of the 

 convex declivity, the side margin almost attaining the tip; abdomen 

 more or less rugulose laterally, rather finely but strongly, somewhat 

 sparsely muricato-punctate, each puncture with a very small dark 

 and inconspicuous hair; male and female similar, except that the 

 prothorax is a little larger and the legs notably longer and thicker 

 in the former. Length (cf , 9 ) 20.0-22.0 mm.; width 10.0-11.3 mm. 

 Southern California (near Colorado Desert), G. \V. Dunn. 



carinatus Lee. 



