LeConte.] 



ZYGOPINI. 259 



Mcemactes, but differs by tlic tirst ventral suture Ijeing sinuate, and less 

 distinct at the middle. 



1. B. cribratus, n. sp. 



Black, rather shining, with very sparse and fine pubescence proceeding 

 from the punctures. Beak as long as the prothorax, stout, not densely 

 punctured, punctures becoming larger towards the base; head sparsely 

 punctured. Prothora.x; oval, longer than wide, broadly rounded on the 

 sides, a little narrower at tip than base, and scarcely constricted, rather 

 flattened, very coarsely and not densely punctured. Elytra elongate-oval, 

 numeri acute, slightly prominent forwards; striae broad and deep, catenate 

 with large quadrate punctures, interspaces as wide as the strise, with a 

 row of distinct distant punctures. Beneath very coarsely and distantly 

 punctured, punctures of the 3-5th ventral segments smaller. Length 4 mm. ; 

 .16 inch. 



Kansas and Texas; two specimens. A very distinct and easily recog- 

 nized species. 



Tribe XVI. ZTVOPIDil. 



The form of these insects is quite peculiar; the body is elongate, sub- 

 rhomboidal, the first and second ventral segments long, the remaining ones 

 short, rarely horizontal, as in the preceding genera, but forming an 

 obliquely ascending surface. The pygidium is concealed by the elytra in 

 our species, but is visible in some foreign genera. The eyes are large, and 

 not concealed, even when the head is deflexed; they are closely approxi- 

 mate on the front, but widely distant beneath and finely granulated. The 

 1)eak is long and slender, only slightly curved, and is received in a deep' 

 prosternal canal, which in some species does not extend upon the meso- 

 sternum, so that the end of the beak is free, as in Conotrachelus; even 

 when, as in others, the mesosternum is excavated, the canal is open and 

 not sharply limited behind. Legs slender, front cox* elongated, and pro- 

 longed into a point on the inner side, claws simple, divergent. 



Our species are of small size, and represent three genera: 



Mesosternum declivous 2. 



excavated PIAZURUS. 



2. Ventral surface obliquely ascending OOPTURUS. 



nearly horizontal ACOPTUS. 



PIAZURUS Sch. 



I refer to this genus three small species which ditter from Copturus not 

 only by the excavated mesosternum, but by the thighs being armed be- 

 neath with a small but distinct tooth. The scales are smaller than in Cop- 

 turus, and some of them are elongate. Tiie elytra in well preserved spe- 

 cimens are marked with a sutural common white si)ot behind the middle, 

 though in P. suhfuaciatus this spot is mucli less conspicuous. 



