CURCULIONIDAE. 487. 



Pectoral groove confined to the prosternum, open behind ; 



Jieak lony, tarsi dilated. Itiiypoki. 



Beak short, tarsi narrow. AcA.Mpri. 



Pectoral groove extending into the mesosternum, sliarply limited behind. 



CEYPT0KIIY^CH1. 



Group I. — Ithypori. 



In this group the pectoral groove is oonlincd to the prosternum, 

 and is not closed behind j the mesosternum is sometimes flat, some- 

 times suddenly declivous. The eyes are coarsely granulated, 

 partly covered in repose by the prothoracic lol)es, which are 

 sometimes very well developed, but in other genera are broad 

 and not prominent. 



The proihurax is, in most species, comparatively smaller than 

 in the other groups, and usually very coarsely sculptured. 'J'lie 

 elytra are wider than the prothorax, with prominent humeri, the 

 outer stria is usually abbreviated, and there is a tendency to an 

 epipleural fold. The thighs are toothed in our genera; the tibiae 

 slender, hooked at the tip ; the claws usually toothed, though 

 sometimes simple or even connate at the base. 



The front coxte are sometimes contiguous, a character nut 

 observed in the other groups of this tribe. 



Postocular lobes broad, not prominent. 2. 

 Postocular lobes prominent, front coxse contiguous ; claws toothed, some- 

 times cleft. Conotrachelus. 



2. Claws slender, simple. 3. 

 Claws approximate, toothed. Rhyssematus. 

 Claws approximate, connate at base. Chalcodermus. 



3. Elytra at base not wider than prothorax. Zaglyptus. 

 Elytra at base much wider. Microhyus. 



With the exception of one Californian llhyssematus, these 

 species all belong to the Atlantic region. 



Group II. — Acampti. 



As ramptorliinus differs from the Cryptorhynchi by the pectoral 

 groove being confined to the prusternnm, though distinctly limited 

 behind, so is the singular insect which constitutes this group 

 Rimilarly separated from thj Itiiypori, by the shorter beak rest- 

 ing upon the front coxie. Tlu; body is elongate, as in Campto- 

 rhinus, and the tibiie arc stout, sinuate on the inner side, and 

 strongly hooked at the tip. The other characters are peculiar; 



