148 AMERICAN COLEOPTERA. 



Pubescence more conspicuous, the hairs of the elytra] intervals generally longer, 

 more erect and bristling tlian those of the stria?; middle coxae nar- 

 rowly separated — seldom by more than J or i their own diameters — 

 size moderate to large, at least moderately convex 1. 



Pubescence shorter, more appressed, nearly uniform throughout; middle coxae 

 (with few exceptions | more widely separated, usually by nearly £ 

 their own diameters, size very variable, form often depressed 2. 



1. Punctures of striae and intervals not very different in size, somewhat confused. 



Front and middle tibia? of % not bent at tip, length of metasternum between 

 the coxa? greater than the post-coxal length of the first ventral seg- 

 ment pufoescens. 



Front tibia?, of % a little bent at tip, metasternum scarcely longer than the 



first ventral segment rudis. 



Punctures of elytral intervals distinctly finer than those of the stria?, not 

 noticeably confused ; front and middle tibiae of % bent and mucronate 

 internally at tip. 



Metasternum subequal in length to the first ventral segment. 



First joint of antennal club not distinctly longer than wide: prothorax 



cordate; color pale brownish yellow I'nlva. 



First joint of antennal club distinctly elongate; prothorax feebly cordate ; 

 color piceous brown, the elytra often paler variCMilor. 



Metasternum distinctly longer than the first ventral segment ; form narrow, 

 elongate, prothorax nearly as wide as the elytra parallela. 



2. Metasternum subequal to or shorter than the first ventral. 



Size large (2.3-2.6 mm.;, pronotal fovea obsolete, joints of antennal club all 



longer than wide, body winged \ ali«l:i. 



Size small (1.6 mm.), pronotal fovea distinct, first two joints of antennal club 



transverse, body apparently apterous inopia. 



Metasternum distinctly longer than the first ventral 3. 



3. Pubescence fuscous or brownish, less inclined than in the following species; 



middle coxa? separated by nearly their own width : form slender, 



strongly depressed ; color piceous brown or nearly black- |»l;i u II la. 



Pubescence cinereous or fulvous (somewhat darker in 8alpingoid.es), middle coxa? 



separated by at most but little more than i their own diameters- • • -4. 



4. Prosternum before the coxse nearly twice as long as the longitudinal diameter 



of the coxa; last ventral of 9 long, broadly, feebly impressed at tip. 



salpiiigoirie*. 

 Prosternum shorter before the coxa?, seldom distinctly more than one and one- 

 half times the coxal length; color rufotestaceous to brown, rarely 

 piceous (dentigera and some serricollis) 5. 



5. Claws of bind tarsi larger (at least in the % ) and unequal, the inner one longer 



and sinuate at tip 8. 



Claws normal and subequal on all the feet 6. 



6. Last ventral plane, or with at most only an ill-defined apical impression, at 



least in the 9 and probably in both sexes [the 9 of amplicollis has not 



been seen ; it may prove to be an exception] 9. 



Last ventral more or less distinctly foveate or impressed in both sexes [in 

 Columbia and Carolina, males only have been seen] 7. 



7. Color piceous brown. 



Last ventral of % with a moderate apical impression which is not more 

 rugose Columbia. 



