1873.J 111 [Horn. 



Inner spur of hind tibite slender acute, outer cylindrical slightly com- 

 pressed, and obliquely truncate at tip. 



Occurs abundantly from Sacramento to Tejon and thence to Keyesville 

 and Owen's Valley, California. 



0. reticulata, Say, Journ. Acad. Ill, 1823, p. 305. 



Black, sub-opaque. Head coarsely but not densely punctured. Thorax 

 sub-pentagonal, broader than long, disc moderately convex, coarsely 

 punctured toward the sides. Elytra ornamented with raised, coarsely 

 anastomising lines. Body beneath black moderately shining. Length 

 .80-1.00 inch ; 20-25 mm. 



Male. Fifth ventral broadly emarginate, sixth acutely notched. 



Female. Fifth ventral truncate, sixth trapezoidal truncate at tip. 



Hind tibial spurs as in the preceding species. 



Occurs iu eastern Xew Mexico. 



C. cribrata, Lee. Proc. Acad. 1853, p. 447. 



Black, moderately shining. Head very sparsely punctulate, with large 

 yellow frontal spot. Thorax as broad as long, slightly narrower toward 

 base, sides strongly arcuate in front, disc feebly convex, smooth, very 

 sparsely punctulate ; color black, sides bordered with red. Elytra sub- 

 i ipaque with fine reticulations. Body beneath black, sub-opaque, rather 

 densely punctulate. Length .70-.80 inch ; 17-20 mm. 



Male. Fifth ventral broadly emarginate, sixth semi-circularly notched. 



Ft nni ft-. Unknown. 



Hind tibial spurs as in moerens. 



Collected in Texas by the Mexican Boundary Commission. 



0. deserticola, Horn. Trans. Am. Ent. Soc. 1870, p. 90. 



Head red, smooth. Thorax red, as broad as long, sides regularly arc- 

 uate, disc feebly convex, with very few punctures and with four minute 

 black spots in a transverse row arcuate to the front. Elytra black, finely 

 reticulate. Body beneath black, punctulate. Femora red tipped with 

 black, tibias aud tarsi black. Length .76 inch ; 19 mm. 



Male. Unknown. 



Female. Fifth ventral broadly rounded, sixth oval at tip and with slight 

 emargination. 



Hinder tibial spurs as in moerens. 



Strongly resembles diehroa in form. One specimen from south of Fort 

 Whipple, Arizona. 



0. diehroa, Lee. Proc. Acad. 1853, p. 332. 



Headluteous, between the eyes and in front black, moderately shining, 

 sparsely punctured. Thorax broader than long, sides moderately arcu- 

 ate, at base somewhat narrower, disc moderately convex sparsely punc- 

 tured, color luteous with two median small black spots. Elytra luteous 

 less shining than the head and thorax, finely scabro-punctate. Body 

 beneath and legs black, moderately shining. Length .74-. 80 inch ; 

 18-20 mm. 



Male. Fifth ventral broadly emarginate, sixth acutely notched. 



