no MEMOIRS ON THE COLEOPTERA 



with the small pale hairs distinct. Length (c?) 15.0-16.0 mm.; 

 width 7.1-7.8 mm. Southern Arizona (Baboquivari Mts.), 



F. H. Snow sobrius n. subsp. 



B Form nearly as in sobrius, but with the elytra much more shining, 

 the depressions as lustrous as the rugae, piceous-black, the pro- 

 thorax relatively even larger; head somewhat as in sobrius but 

 with finer pale hairs; prothorax (cf ) nearly three-fourths as wide 

 as the elytra or two-thirds ( 9 ), as in sobrius but with the punctures 

 less coarse and widely separated though unequally so, the flanks 

 of the median convexity almost free from punctures, the broad 

 lateral deplanate area coarsely, closely, transversely rugose and 

 punctate; transverse base with the median sinus of the preceding 

 barely at all traceable; elytra much smaller and less elongate in 

 the male than in the female, the rugae laterally strong and rather 

 close-set, smaller and more comminuted medially, the depressions 

 not obviously granulate; inner disjointed costa feeble, lost al- 

 together from slightly behind the middle, the outer costa stronger 

 in the male; abdomen nearly as in sobrius. Length (cf, 9 ) 14.0- 

 17.5 mm.; width 6.8-7.9 mm. Arizona, Warren Knaus. 



pacatus n. subsp. 



Body grayish-black, opaque, very much smaller in size and more slender; 

 head feebly impressed, the sparse hairs unusually short; prothorax 

 two-fifths wider than long, the arcuate sides becoming gradually 

 very feebly sinuate basally but not straight or parallel even at the 

 basal angles, which are very slightly more than right, not rounded; 

 base with a very broad and rather feeble median sinus; surface not 

 very coarsely, deeply, rather closely but not very coalescently 

 punctate, with a transversely arcuate impression across the convex 

 part and with numerous impunctate areas, rather narrowly de- 

 planate and finely, transversely plicate laterally; elytra scarcely 

 two-fifths wider than the prothorax, fully two-thirds longer than 

 wide, evenly elongate-oval; surface with the rugae rather small in 

 size, well separated and only rather feebly elevated, not noticeably 

 more shining, the interspaces with a few minute scattered granules, 

 the costa rather feeble but fine and distinct, the inner costa very 

 feeble, obsolete posteriorly; abdomen finely, not very sparsely punc- 

 tate, the pale hairs evident. Length (cf) 13.0 mm.; width 4.8 mm. 



Arizona (Huachuca Mts.) parvus n. sp. 



9 Form stouter, more oblong, the elytral humeri broadly rounded as 

 usual though rather obvious. Dark rufo-piceous in color, opaque, 

 the elytra in great part notably shining even in the depressions, 

 which do not differ sensibly in lustre from the rugae; sexes not dif- 

 fering very much in outline; head feebly impressed, the sparse pale 

 hairs shorter than usual; prothorax large, a fourth to third wider 

 than long, the sides rather strongly serrulate, rounded, converging 

 and broadly sinuate posteriorly as usual but becoming parallel near 

 the angles, which are minutely acute and subprominent laterally; 

 base very feebly sinuate in median third; surface only very moder- 

 ately convex, with the punctures well separated, small anteriorly, 



