464 



CASEY 



number of species, for the most part since received, as 

 follows : — 



Elytra subcylindrical, more abruptly narrowed at base and toward 

 apex as in tristis Lee. ; pronotum strongly convex, generally very 

 feebly impressed along the median line for a short distance at the 

 centre of the disk 2 



Elytra evenly oval in outline, the pronotum usually less convex and 

 never impressed along the median line 3 



2 — Form more elongate than in tristis^ the size larger though very 



variable in this respect, dull in lustre, the elytra with gray indu- 

 ment between the tubercles laterally ; head rather coarsely but 

 sparsely punctured; prothorax nearly as long as wide (d^) or 

 shorter (9)i very coarsely punctured, sparsely toward the 

 middle, where the short impressed line is distinct, densely and 

 more or less confluently punctured toward the sides posteriorly, the 

 sides subangularly prominent near apical third, converging, arcu- 

 ate and tuberculose thence to the base, the basal bead coarse and 

 strong ; elytra three-fourths longer than wide, slightly wider than 

 the prothorax and three-fourths to four-fifths longer, more evi- 

 dently wider in the female than in the male, with coarse flattened 

 tubercles which are only vaguely lineate in arrangement and 

 mingled with others which are smaller and more convex ; pro- 

 sternum and abdomen very coarsely but sparsely punctate, the 

 former not at all tuberculose. Length 10.2-17.5 mm.; width 

 3.8-6.5 mm. Arizona (Baboquivari Mts.), — F. H. Snow. 



variabilis n. sp. 



Form more slender, smaller in size, with relatively much larger pro- 

 thorax, dull in lustre, the pronotum laterally and the elytra, 

 almost throughout between the tubercles, covered with gray indu- 

 ment ; head remotely, rather coarsely punctate ; prothorax as long 

 as wide, obtusely subprominent at the sides behind apical third, 

 the sides thence converging and arcuate to the apex and more con- 

 verging to the base, being sinuate near the prominence and before 

 the basal margin and tuberculose and arcuate intermedially, the 

 surface scarcely impressed medially, sparsely and moderately 

 coarsely punctate, only a little more closely laterally ; elytra 

 small, one-half longer than wide, distinctly narrower than the 

 prothorax and only one-half longer, with flattened tubercles which 

 are very uneven in size, rather sparse laterally and seriate toward 

 the suture ; prosternum and abdomen as in the preceding. Length 

 13.0 mm. ; width 4.7 mm. Arizona (Tufson). 



incrustans n. sp. 



3 — Elytra tubeixulose 4 



Elytra without tubercles, the surface smooth and alutaceous or 



duller , 7 



4 — Elytra not wider than the prothorax 5 



Elytra wider than the prothorax 6 



