496 COLEOPTERA OF NORTH AMERICA. 



developed than in Baris and its allies, and in many species are 

 scarcely apparent. The beak and antenna? are generally of more 

 slender form than in Baris, but these characters are not without 

 exceptions. 



A. Body witliout erect bristles ; 



Tibiae stout, witb longitudinal grooves (as in Baris). 2. 



Tibiae slender, not grooved. 4. 



2. Claws two, separate. 3. 

 ■ Tarsi with a single claw. Eisonyx. 



3. Pectoral groove shallow, indefinite. Pachybaris. 

 Pectoral groove deep, sharply defined. Stethobaris. 



4. Side margin of prothorax as usual. 5. 

 Side margin of prothorax well defined. Microcholus. 



5. Third joint of tarsi broad, bilobed. 6. 

 Third joint of tarsi narrow. Calandrinus. 



6. Claws separate. Centrinus. 

 Claws connate at base. Zygobaris. 

 Claws single. Barilepton. 



B. Body with stout erect bristles, intermixed with the dense covering of 



scales ; tarsi narrow ; 

 Bristles veiy long. Euchaetes. 



Bristles short. Plocamus. 



Excepting two species of Centrinus from California, all these 

 species inhabit the Atlaiitic region from New England to Colorado 

 and Texas. 



Tribe XXI.— HORIWOPIjVI. 



The sub-family of genuine Curculioninai fitly closes with a very 

 anomalous insect, which while having relations with several of 

 the earlier tribes, exhibits in addition a character which is other- 

 wise seen in one of the sub-families of the Calandridae. The eyes, 

 namely, are very large, transverse, and coarsely granulated; they 

 are widely separated above, but are nearly contiguous beneath. 

 It follows from this that the antennae in repose must be received 

 in front of the eyes, which therefore form as it were a collar be- 

 neath ; and the antennal grooves, which are deep and oblique, 

 attaining the eyes near the upper end, are suddenly and acutely 

 flexed beneath, forming a deep, transverse excavation in front of 

 the eyes. 



The beak is shorter than the prothorax, stout, somewhat flat- 

 tened, a little wider at tip than l)ase; the mandibles are rather 

 flattened, acute at tip, toothed on the inner side. The gular 



