LeConte.] HYLURGINI. 383 



OARPHOBORUS Eichhoflf. 



This geaus contains species of small size and elongate form; dull, densely 

 punctured surface, clothed with very small yellowish scales. The elytra 

 are striate with large, approximate punctures; the second interspace is nar- 

 rowed and abbreviated on the declivity, and the third is elevated into a 

 high, spinulose crest, whicli unites with the apical margin; this margin is 

 similarly thickened and elevated, though to a less extent. The funicle of 

 the antennae is 5-jointed; first joint larger and rounded, the others closely 

 united, forming a short, conical mass, as in Phlceosinus; club lai-ge, slightly 

 pubescent, moderately compres ed; rounded, obtuse at tip, and divided by 

 two straight sutures; the first joint of the club is more shining than the 

 others. Prosternum very short in front of the coxae, which are large, prom- 

 inent and contiguous. The tibiaj are moderately dilated, the front ones 

 have two acute teeth near the tip, on the outer side, and a long, terminal 

 hook at the inner angle; the other tibiae are obliquely rounded at tip and 

 finely serrate; the first joint of the tarsi is shorter than the second; the 

 third is equal to the second, not bilobed; the fifth is as long as the others 

 united. The mouth is clothed with long, coarse hair as in Chwtophlceus. 



First and third interspaces of the elytra elevated on 



the declivity and serrate 2. 



First and third interspaces scarcely elevated, not ser- 

 rate 1 . simplex. 



3. First and third moderately elevated; second not much 



narrowed on the declivity 2. bifurcus. 



First and third strongly elevated; second much nar- 

 rower on the declivity 3. bicristatus. 



1. C. simplex n. sp. 



Elongate-cylindrical, blackish-brown, somewhat shining. Head finely 

 and densely granulato-punctate in front, nearly smooth behind. Prothorax 

 twice as wide as long, broadly rounded on the sides, narrowed and feebly 

 constricted in front, which is nearly truncate ; base slightly bisinuate ; 

 finely punctured, with a faint indication of a smooth dorsal line ; scarcely 

 perceptibly pubescent. Elytra with striae of quadrate punctures, inter- 

 spaces finely roughened, thinly clothed with very small scales, second in- 

 terspace depressed and narrowed on the declivity, first and third slightly 

 elevated, not serrate. Length 2.3 mm.; .085 inch. 



J^, Head with a round excavation fringed with long yellow hairs. 



9. Head slightly impressed, not hairy. 



Mojave Desert, California; Mr. Crotch. The fifth joint of the funicle is 

 broader and almost part of the club ; the third joint of the tarsi is not wider 

 than the second, just as in the other species. 



2. O. bifurcus Eichhoff, Berl. Ent. Zeitschr. 1868, 147; Dendroctonus 

 hif. Zimm., Tr. Am. Ent. Soc. 1868, 148; Chapuis, Mem. Soc. Roy. Sc. 

 Liege, 1869, 97. 



(^ . Front with two small approximate tubercles. 

 $ . Front uniformly convex. 



