LeConte.l 



CEUTORHYNCHINI. 267 



with long, erect, gray hairs; prothorax sparsely and coarsely punctured, 

 with a tuft of white hair at the basal angles. Elytra with regular stria^ 

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

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

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

 sliorter 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 

 I'ows of elytral punctures more regular, and the white spot more elon- 

 gated. 



Tribe XVIII. CEUTOKHYKfCHIXl. 



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 Avith distant front coxfe, by the 

 pygidium being perpendicularly detlexed, and marked with a deep excava- 

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

 the ventral segments, against which 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 the 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 Cryptorhynchoid 

 series, including Zygopird. 



The antenna' are geniculate as usual, inserted about the middle of tlie 

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

 annulated. The side pieces of the mesostcrnum 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 tij) 



of elytra; pectoral groove extending upon the 



metasternum ... Mononycbi. 



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



and carinate in front of the line: 

 Pectoral groove, extending behind the prosternum. . Coellodes. 



Pectoral groove anterior, sometimes eflfaced. 



Beak long and slender €eutorbyiiobi. 



Beak stout, usually short . . ^ Pbytobli- 



Group I. Mononycbl. 



A single genus constitutes this tribe. The species are of broad 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 tlie tip of the elytra; the declivous exposed portion is, however, gibbous 

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

 the male: in the female there is a small, very deep excavation, surrounded 



