12 H. C. FALL. 



Pubescence erect or suberect; pro thorax widest a little before the 

 base; upper tooth of front tibia nearly twice as distant 

 from the base as from the apical tooth; strial punctures of 

 elytra setiferous. 

 Prothorax coarsely punctured, the punctures fully as coarse as 

 those of the elytra; clypeus truncate or truncato-emar- 



ginate 8. villosa. 



Prothorax finely more densely punctured, the punctures finer 

 than those of the elytra; clypeus arcuate or more narrowly 

 truncate 9. puberula. 



Pubescence much inclined; prothorax widest just before the 

 middle; upper tooth of front tibia midway between the 

 base and apex; clypeal margin arcuate or sub truncate at 

 middle, the angles rounded; strial punctures of elytra 



nude 10. brevisetosa. 



Tooth of claw post median in position, but much shorter than the 



superior portion of the claw; strial punctures nude 6. 



G. Clypeal suture more or less distinct, hairs of upper surface longer 

 and more numerous. 



Punctuation of upper surface coarser and denser, the elytral costae 

 scarcely evident ; abdomen coarsely closely punctate 

 throughout; first joint of hind tarsus nearly or quite as 

 wide as long 11. lmiricata. 



Punctuation of upper surface less coarse and dense; elytral costae 

 better defined; abdomen sparsely and finely punctate at 

 middle, coarsely and closely at sides; basal joint of hind 



tarsus nearly twice as long as wide 12. liispirta. 



Clypeal suture wanting, hairs of upper surface very short and 

 sparse, elytral costae distinctly defined. 



13. sparsesetosa. 



7. Labrum broadly arcuately emarginate, rarely more deeply im- 



pressed (mcerens, peninsularis) , mentum not excavated in 



front 8. 



Labrum deeply divided (bilobed), mentum excavated in front. 



Front distinctly triangularly impressed, ventral segments more or 

 less tuberculate; basal joint of front tarsi in the male 

 strongly dilated, much wider than the second. 



14. knausii. 



Front feebly or scarcely impressed, ventral segments not tuber- 

 culate, but with a series of short parallel rugae on segments 

 2-4 in the male; basal joint of front tarsus (male) not 

 wider than the second 15. fissilabris. 



8. Mentum broadly convex or nearly flat, not at all concave, and at 



most but feebly declivous in front; transverse raised line 

 either entirely absent or extremely faintly indicated 9. 



