LeConte. 



CEUTORHYNCHINI. 267 



with long, erect, gray hairs; prothorax sparselj' and coarsely punctured, 

 with a tuft of white hair at the basal angles. Elytra with regular stri* 

 composed of large punctures; interspaces narrower than in T. tardipes; an 

 elongate sutural spot of white hair in front of the middle. Hind thighs 

 with about four small teeth on the under side; hind tibite comparatively 

 shorter than in T. tardipes, not serrate on the outer edge. Length 1.8 mm. ; 

 .07 inch. 



Illinois; Dr. Horn. Smaller than the smallest T. centralis, with the 

 rows of elytral punctures more regular, and the white spot more elon- 

 gated. 



Tribe XVIII. CEUTOKHYNCHINI. 



This numerous tribe consists of small species of broad form, with the 

 beak and pectoral groove varying according to genus. They are distin- 

 guished from all the preceding tribes with distant front coxse, bj' the 

 pygidium being perpendicularly deflexed, and marked witli a deep excava- 

 tion (Mononychus), or witli a continuation of the acute lateral margin of 

 the ventral segments, against wliicli the apical margin of the elytra rests. 

 In the latter case, the upper part of the dorsal segment is finely carinate; 

 in both cases, the anal segment of the (^ extends in front of tlie excavation 

 or transverse line. In all the genera the coriaceous sutural margin of the 

 left elytron is much wider than in any genera of tlie Crj'ptorhynchoid 

 series, including Zygoirini. 



The antennae are geniculate as usual, inserted about the middle of the 

 beak; the funicle is 6-7-jointed, and the club oval-pointed, pubescent and 

 annulated. The side pieces of the mesosteruum are usually visible from 

 above. 



They may be divided into four groups, the first of which indicates more 

 properly a sub-tribe. 



A. Pygidium without transverse line for reception of tip 



of elytra; pectoral groove extending upon the 



metasternum ... Mononychi. 



B. Pygidium with line for reception of tip of elytra. 



and carinate in front of the line: 

 Pectoral groove, extending behind the prosternum. . C'celiodes. 



Pectoral groove anterior, sometimes efl!aced. 



Beak long and slender Ceutorliynohi. 



Beak stout, usually short Pby tobii- 



Group I. Itlonoiiychl. 



A single genus constitutes this tribe. The species are of In'oad form, and 

 larger than any others in the tribe, and are easily distinguished by the pygid- 

 ium not being carinate in front, and with no transverse line for the reception 

 of the tip of the elytra; the declivous exposed portion is, however, gibbous 

 at the upper part, surrounded with an impression, distinctly margined in 

 the male; in the female there is a small, verj' deep excavation, surrounded 



