NORTH OF MEXICO. 303 



Elytra broad, flattened, truncate al 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 . i r icosi a i .1 . 



Elytra glabrous, with regular strife of moderately large punctures, interstices equally 



and very feeblj convex. pedinoides. 



Elytra elongate oval, convex, narrower and feeblj emargiuate at base, angles uol rectangu- 

 lar; thorax narrower ;n base, angles obtuse, n< >i overlapping basal angles of elytra. 

 Anterior femora mutic in both sexes. 



Elytra shining; with striae of punctures, carbon aria. 



Elvira suli-atr or striate', striae punctured, interstices convex, with muricate 



punctures. nbsoleta. 



Elytra diffusely punctured. 



Elytra shining, punctures simple. quadri col lis. 



Elytra opaque, densely muricatelj ouuetured, becoming granulate humeralits. 



\ nterior femora armed in the male. 



Tooth verj ohms.', elytral sculpture of smooth tubercles. g ra 11 ula ta. 



Tooth very acute, elytra with striae of fine punctures. ext ricata. 



limn p 11. 



The spurs of the auterior 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 ami width of the oilier, ami very strongly curved backward, especially in the 



Thorax smooth, finely and sparsely punctured. Section A. 



Thorax rugous, coarsely ami confidently punctured. Section B. 



8< 1 1 ion A. 



All the femora toothed in both sexes. 



Teeth of femora acute. ;i 1 m a t a . 



militaris. 



Teeth of femora obtuse. fem orata. 



Anteiioi femora alone armed with a tooth, or all the femora mntie. 



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. longicoll is. 



Thorax square. - > n I i 1 i ~ . 



Species usually ventricose, elytra striate, femora of j, either acutelj toothed or sinuate 

 u tin tip. 

 Antei ioi femora with a strong curved tooth in v, only, ventricosa. 



•' stiai'_;lit acute tooth in J, ami 9- 

 Thora x deeply emarginate in front , angles not everted. lucae. 



feebly " " " angles acute, everted, gracilis, 



sinuate near the tip in J and J. innocens. 



-ides of thorax stronglj rounded, always narrower at base. 



'Thorax verj convex, humeral angles of elytra indistinct or wanting. 



Anterior femora armed in both sexes. g ra ndicoll is. 



Anterior let a nnitie in both sexes. gigantea 



'Thorax moderately convex, humeral angles of elytra always evident. 



Ant. femora mutic in both sexes. nigrina. 



Ant. femora armed at least in <?. 



