32 OTIORHYXCHID^. 



[Horn. 



The color of the surface vestiture varies greatly. In some specimens it is 

 entirely plumbeous, in many cinereous obsoletely fusco- maculate, while in 

 ligatus (a 9) the fuscous spots are confluent and the elytra subvittate. 

 The deciduous mandibular pieces are of slender conical form, very feebly 

 arcuate and not long. 



Occurs in Kansas, Colorado and Utah. 



O. porosus Lee, Proc. Acad., 1845, p. 225. 



Rostrum moderately transversely impressed at base, above trisulcate, 

 median sulcus broad and shallow, lateral sulci short and deep. Thorax not 

 twice as wide as long, sides with feeble tuberosity moderately arcuate, base 

 moderately constricted ; surface coarsely punctured and irregular, median 

 line moderately impressed. Elytra oval, base truncate, humeri rectangular 

 slightly broader than the thorax at base, with striaj of moderately large 

 punctures, surface with plumbeous scales. Body beneath and legs covered 

 with plumbeous scales. Length .36 inch ; 9 mm. 



This species and the preceding have the tenth elytral stria entirely ob 

 literated, and the tuberosities of the thorax feeble, in both of which 

 characters tliey differ from all the species which precede. 



One specimen collected by Maj. Webb while on the boundary survey 

 between the United States and Mexico. 



EUPAGODERES, n. g. 



This genus contains those species, formerly placed in Ophryastes, with- 

 out lateral thoracic tubei'osities. The tarsi are more dilated, the joints 

 proportionately shorter and the third more distinctly bilobed. The distal 

 angles are not produced in a spiniform process, a character by no means 

 constant, however, in Ophyrastes. In this genus the articular cavities of 

 the hind tibiae become internal and the tip of the tibia truncate, showing 

 an oval scaly space. The transition from the double apical fringe, which 

 is usual, to the truncate tip with the two rows of fimbriae surrounding an 

 oval space is in this genus so gradual, even with the limited number of 

 species, that it seems to indicate the little value of the characters drawn by 

 Lacordaire from " corbeilles ouvertes" and " corbeilles caverneuses." The 

 deciduous mandibular piece is similar to that of Ophryastes. As in the 

 latter genus some species have the rostrum and vertex continuous, the 

 greater number, however, have a sinuation at the base of the rostrum. 0. 

 Sallei Sell, from Mexico belongs here. 



The following are our species : 

 1 — Vertex fiat, rostrum without basal impression. 



Rostrum sulcate, thorax finely punctured speciosus. 



Rostrum sulcate, thorax coarsely and deeply punc- 

 tured sordidus. 



Rostrum not sulcate, thorax coarsely and deeply 



punctured deeipiens. 



2 — Vertex convex, rostrum with basal impression. 



Elytral striae broad, punctui'es large and close. 



