38 Journal New York Entomological Society. [Voi. xvii. 



at middle, these latter lacking in some less developed specimens 

 according to Horn. In the female the femora are unarmed. 



The type oi frontalis is in the Ulke collection ; it is from Texas. 

 The type of complex — from New Mexico — in the LeConte col- 

 lection bears the ladel frontalis in Horn's handwriting, and with it 

 are three examples from Columbus, Texas, collected by Hubbard and 

 Schwarz. According to Horn the species occurs also in Florida. 



17. 0. mandibularis Linell, Proc. Nat. Mus., 1895, p. 723. 



Length 5.75-7.5 rnm. The form of the mentum in front is 

 apparently as described in the table, but is very difficult to see because 

 of the numerous hairs. The tabular characters are sufficient for the 

 recognition of this species, which is not closely related to any other 

 except sparsus, from which — if we except the somewhat difficult 

 mental character — there is little to depend upon. The size averages 

 greater in inandibularis and the prothorax is a little less transverse. 

 The type was described from Winslow, Arizona ; it is also known 

 from Las Cruces, Deming and Albuquerque, New Mexico. 



18. 0. sparsus Lee, Trans. Am. Ent. Soc, 1868, p. 51. 



The prothorax is shorter in this species than in any other of our 

 forms, being distinctly more than twice as wide as long. The cephalic 

 tubercle is even a trifle more posterior in position than in mandibularis, 

 being quite as remote from the frontal margin as from the base of the 

 occiput. The elytral striae are finer and less impressed than in ?nan- 

 dibularis and the punctures of the intervals are sparse and scarcely at 

 all asperate, not very different however from mandibularis, in this 

 latter respect. I'he type — length 5 mm. — is from Canon Blanco, 

 New Mexico. I have a single example — length 5.3 mm. — from 

 Thornton, New Mexico, collected by Dr. Fenyes. 



19. 0. estriatus Schaef., Can. Ent., 1906, p. 271. 



This remarkable species is based upon a specimen taken at Mill- 

 wood, Fresno Co., California. Mr. Schaeffer places it provisionally 

 in Ochodaus, stating that a new genus may yet have to be erected for 

 it. Its peculiarities are summed up by its author as follows: "The 

 more elongate form, the short strongly widening middle and hind 

 tibiae, the spinous hind trochanters, the elytra without striae, and the 

 strongly reflexed or rather strongly thickened apical margin of the 

 clypeus will readily distinguish this from any of the described species; 

 it is also remarkable by having one spur of both middle and hind 

 tibiae pectinate." 



