LeConte.J 



ZYGOPINI. 259 



Mamactes, but differs by the tirst ventral suture being 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. Prothorax 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, 

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

 with large quadrate punctures, interspaces as wide as the stria?, 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. ztuopini. 



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 

 beak 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 coxae 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 surfiice obliquely ascending CTOPTURUS. 



nearly horizontal AOOPTUS. 



PIAZURUS Sch. 



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

 only by the excavated mesostei'num, but by the thighs being armed be- 

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

 turns, and some of them are elongate. The elytra in well preserved spe- 

 cimens are marked with a sutural common white spot behind the middle, 

 though in P. subfcisciaius this spot is much less conspicuous. 



