NORTH AMERICAN COLEOPTERA. 99 



Female. — Prosteriium coarsely not densely punctate ; anterior and middle tibise 

 slightly arcuate, the posterior straight; last central segment (148) slightly eniar- 

 ginate and with a slight transverse ante-apical lamina ; last dorsal coarsely, 

 closely punctate, the apex slightly emarginate. 



All inconspicuous si)ecies resembling a diminutive denttpe-% but 

 differing in its style of ornamentation as well as by the sexual char- 

 acters. 



Occurs in western Nevada, and at Calaveras, Cal. 



Group V. 



The following species form a small and apparently natural group 

 characterized by a subcylindrical, parallel form, with the elytra very 

 little wider than the thorax. The upper surface is usually slightly 

 pubescent with grayish hair, but this with careless handling is apt to 

 be lost. The thorax is convex, and while but one exhibits a faint 

 trace of median depression several have callosities. The punctuation 

 is dense and rather coarse. In some respects this group seems to 

 connect the first and second groups, but the species appear, on the 

 whole, to be degraded forms of the series with the last ventral seg- 

 ment serrate, and to represent, or at least parallel the group placed 

 at the end of the other series. 



The prosternum is lobed in all the species, the lobe short and in- 

 distinct in the bronze species, very prominent in the blue species. 



The following table will assist in the determination of the species : 



Anterior femur distinctly toothed. 

 Color dark bronze or greenish. 

 Thorax with distinct callosities. 



El>i:ral costa; distinct; sides of thorax regularly arcuate 30. deleta. 



Elytra! costse replaced by smooth lines ; sides of thorax narrowed at ajiex 



and base .31. desorta. 



Thorax without callosities, the punctuation coarse, but not crowded ; sides 



regularly arcuate ; costse of elytra distinct 32. lixa. 



Color bright blue, green or violaceous. 



Thorax with faint median depression (in the larger specimens), sides nar- 

 rowed at base; elytral sculpture very feeble 33. eyaiiella. 



Anterior femur without tooth. 

 Color blue-green. 



Surface densely punctulate ; sides of thorax regularly arcuate ; apex of ab- 

 domen exposed 34. Iiiiiiiilis. 



Of the five species of this group three occur in California (two 

 Southern, one from the North), the other two are from Arizona. 



30. C. deleta Lee— Moderately elongate, subcylindrical, dark bronze, some- 

 times brownish or greenish, sparsely pubescent ; antennse rather short, gradually 



