LeOonte.] 



CRYPTORHYATCHINI. 229 



species in the group by the punctuation of the ventral segments; first and 

 second very coarsely but not densely punctured; third and fourth strongly 

 punctured; fifth finely and more densely punctured, with two distinct tu- 

 bercles as in G. nenuphar. The thighs are armed with two small acute 

 denticles. 



9. O. nivosus, n. sp. 



Rather stouter than C. elegans, brown varied with black, pubescence 

 white varied with fine chocolate brown. Beak short, stout, curved, finely 

 punctured and striate. Prothorax not wider than long, broadly rounded on 

 the sides, moderately constricted near the tip; very coarsely but not densely 

 punctured, not carinate; with a complex white reticulation each side con- 

 nected transversely on the disc in front of the middle; a short posterior 

 dorsal line white. Elytra witli striae composed of large, distant quadrate 

 punctures, interspaces flat; surface in great part white, with a transverse, 

 common basal spot, (a continuation of the brown thoracic disc), and large, 

 apical space brown; there is also a transverse band at the middle, which is 

 variegated brown and white, dilated into a large, sutural brownish blotch ; 

 all these markings are connected at the suture. Body beneath densely 

 brown-pubescent, metasternum and side pieces white; ventral segments, 

 1-4 each with a white spot near the sides, coarsely punctured ; fifth 

 with two basal white spots, finely and densely punctured. Legs annulated, 

 thighs with one tooth and a small denticle. Length 5 mm. ; .20 inch. 



Colorado, abundant. This species resembles somewhat in appearance the 

 Texan and Mexican C. leucophmtus, but is not otherwise allied to it. 



Division I— B. Sp. 10-18. 



The species of this division differ from the preceding, chiefly by the al- 

 ternate interspaces of the elytra being elevated, and not interrupted into 

 short, abrupt crests; the inner one (of the third interspace) is in every case 

 entire. In other respects they resemble those of the preceding division in 

 several important characters; the prothorax is more or less carinate, not 

 grooved; the surface is finely pubescent, with, at most, lines of very short 

 bristles on the elytra. On the other hand, the thighs are armed with a 

 single, usually acute tooth, without a trace of the second tooth or denticle. 



a. Humeri dentiform; ventral segments 2-4 sparsely punc- 



tured ? 10. cratsegi. 



b. Humeri not dentiform; ventral segments densely and coarsely punc 

 tured; beak long and slender; antennae inserted about the middle; pro 

 thorax punctured, not cribrate, mesosternum protuberant. 



Prothorax strongly constricted in front 2. 



" " " " " gradually nar- 

 rowed; pubescence yellow-gray, speckled with white 11. adspersus. 

 2. Femoral tooth large, acute; white markings conspic- 

 uous, without intermixed bristles 12. similis. 



