NORTH OF MEXICO. 



303 



Elytra broad, flattened, truncate at base, angles rectangular; thorax broad at base, angles 

 rectangular, overlapping the humeral angles of elytra. (Pediniform species). 

 Elytra with alternate Interspaces more elevated, (each elytron sub-tricostate). t r i c o s t a t a . 



Elytra glabrous, with regular strise of moderately large punotures, interstices equally 



and very feebly convex. pe din i d c- s . 



Elytra elongate oval, convex, narrower and feebly emargiuate at base, angles not rectangu- 

 lar; thorax narrower at base, angles obtuse, not overlapping basal angles of elytra. 

 Anterior femora in n tie- in both sexes. 



Elytra shining; with striae of punctures. ca r bo nari a . 



Elytra, suloate or striate, striee punctured, interstices convex, with muricate 



punctures. obsol e la. 



Elytra diffusely punctured. 



Elytra shining, punctures simple. c| uadri col lis. 



Elytra opaque, densely muricately punctured, becoming granulate. h u m ©rails . 



Anterior femora armed in the male. 



Tooth very obtuse, elytra,! sculpture of smooth tubercles. g r a n u 1 a 1 ;i . 



Tooth very acute, elytra with strise of fine punctures. e x t r i o a t a, . 



Group ii. 



The spurs of the anterior tibiae are similar to each other in both sexes. Occasionally the anterior spur is some- 

 what longer than the other; never, however, presenting anything similar to that seen in the preceding group, in which 

 it is nearly double the size; and width of the other, and very Strongly curved backward, especially in the J. 



Thorax smooth, finely and sparsely punctured. 

 Thorax rugous, coarsely and continently punctured 



Section A. 



All the femora, toothed in both sexes. 

 Teeth of femora acute. 



Teeth of femora obtuse. 



Section A. 

 Section B. 



a r m a t a . 

 militaris. 

 fern orat a, . 



Anterior femora alone armed with a tooth, or all the femora mutic. 



Thorax sub-quadrate, frequently narrower in front, base very rarely narrowed, sides feebly 

 rounded. 

 Elongate species, elytra never ventricose nor striate, femora mutic. 



Thorax elongate. 1 o u g i o oil i s 



Thorax square. g e n t i 1 i s . 



Species usually ventricose, elytra Striate, femora of }, either acutely toothed or sinuate 

 near the tip. 

 Anterior femora with a strong curved tooth in £, only. 

 " " " straight acute tooth in % and 9. 



Thorax deeply omarginate in front, angles not everted. 

 " feebly " " " angles acute, everted. 



" " sinuate near the tip in % and f. 



Sides of thorax strongly rounded, always narrower at base. 

 Thorax very convex, humeral angles of elytra, indistinct or wanting. 

 Anterior femora armed in both sexes. 

 Anterior femora mutic in both sexes. 

 Thorax moderately convex, humeral angles of elytra always evident. 

 Ant. femora mutic in both sexes. 

 Ant. femora, armed at least in 9 . 



v entricos a, . 



1 u re . 



g r a c i 1 i s . 



in n ce n s . 



grandi oollis. 

 g i gantea . 



n i g r i 11 a . 



