NORTH OF MEXICO. 325 



GROUT II — CERENOPI. 



Two genera are very clearly indicated among the species heretofore considered a- con- 

 stituting but one. 



External apical angle of anterior tibia? nol prolonged. argoporis. 



prolonged. cerenopus. 



u u 



ARGOPORIS, n. gen. 



The species of this genus differ from those of Cerenopus, in having the anterior tibiae 

 curved and the outer angle rounded. The epistoma is also rounded in front, never emar- 

 ginate or squarely truncate. The labrum is more prominent. The tibiae of the males are 

 all denticulate within. The anterior and posterior femora are equally clavate. 



Two species in our own fauna and one from Mexico (probably undescribed) constitute 

 this genus, as follows : 

 Elytra finely sulcate, interstices elevated. 



Hind femora % with an acute tooth, with denticulate edg :s. sulcip e nni s . 



Elytra with rows of large punctures, interstices Hat. 

 Legs ferruginous. 



Hind femora \ with a bifid tooth. bicolor. 



(Legs black; male not seen. Mexico. a tripe-.) 



A. sulcipennis, Lee, Cerenopus Ann. Lye. V.. p. 143. 



Differs from bicolor in the elytral sculpture and the form of tooth of hind femur of 

 male. The legs are ferruginous. The upper surface of body is rather more opaque than 

 cither of the other species, and the thorax mere dens ly and coarsely punctured. 



i )( curs in < )regon, California and Arizona. 



Length .44-.54 inch. 



A. bicolor, Lee., Cerenopus Ann. Lye. V.. p. 143. 



The thorax of this species is finely and sparsely punctured, and the entire upper sur- 

 face of body glabrous. 



Occurs very abundantly in Arizona. Specimens are also found in Sonora ami the 

 ( lolorado I >> sert 



1 ,ength A'2-.~>^ inch. 



CERENOPUS, Lee. 

 aopus, Lec., Ann. Lye. V.. p. 1 18. 



The externa] apical angle of the anterior tibiae is always prolonged, though rather ob- 

 tuse at ap \. and the tibiae feebly arcuate. The anterior femora are always very suddenly 

 clavate in the male, the thickened portion being quadrangular in section, and notably 



AMERI. l'llll — VOIi. xrv. — 82 



