H. C. FALL 311 



7. Submarginal stria of elytra fairly regular, the marginal interspace nearly 



or quite devoid of punctures in apical half; prothorax more narrowed in 

 front and more rounded on the sides; eyes not more prominent than the 

 anterior angles of the prothorax; elytral shield well develojied; ocular lines 



quite near the eyes 20. immaculatus 



Submarginal stria of elytra less regular, often completely undefined or con- 

 fused with the punctures of the marginal interspace, which is punctured 

 from base to apex; sides of prothorax straighter and less convergent in front • 

 eyes more prominent; ocular hues more distant from the eyes; elytral shield 

 feebly indicated or entirely w'anting. 



Eyes in c? separated by more than twice the length of the basal anteniial 



joint; color pale whitish yellow, size larger (3 to 4 mm.) . . IS. jacobyi 



Eyes in c? separated by about twice the length of the basal antennal 



joint, color darker, more dingy yellow, size smaller (IJ to 2J mm.). 



19. densus 



8. Sutural edge, and usually the posterior two-thirds of the outer marginal 



edge of the elytra very narrowly blackish; front claws of d" rath.er si roiigly 



enlarged 22. marginipennis 



Sutural edge blackish, margin not at all so. 



Front claws of d^ not very strongly enlarged though ob\-iously so, elytral 



shield nearly or quite absent 23. punctatus 



Elytra maculate with black var. shasta* 



Front claws of cf quite strongly enlarged; punctuation somewhat coarser, 

 the elytral striae better defined and more impressed; elytral shield 



evident 24. convietus 



Sutural edge not darker; front claws of cf obviously but not stronglj- en- 

 larged; elytral lobe nearly or quite devoid of the usual marginal series of 

 punctures 2.o. arizonensis 



9. Integuments poKshed 29. mercurialis \ ar. 



Integuments alutaceous and not shining 10 



10. Eyes much more distant in both sexes than the vertical width of their 



upper lobes. 



Submarginal stria of elytra impressed, regular 2(). lodingi 



Submarginal stria of elytra not distinctly impressed, the punctures con- 

 fused 129. sublimatus^ 



Eyes less distant in the cf , but not in the 9 , than the vertical width of their 

 upper lobes Gl. impurus var. xanthus 



Eyes less distant in both sexes than the vertical width of their ujiper lobes. 



27. placidus 



11. Submarginal interspace of elytra more or less prominent or subcostifonn; 



size rather large (3^ to 4 mm.) 127. liebecki 



Submarginal interspace of elytra not i)rominently convex 12 



12. Eyes of ? separated by fully twice the length of the basal antennal joint 13 

 Eyes of 9 separated by barely twice the length of the basal antennal 



joint 21 



Ej^es of 9 separated by about l-J times the length of the basal antennal 

 joint; front without ocular hues 41. crassus 



TR.\NS. AM. ENT. SOC, XLI. 



