CURCULIONIDAE. 491 



Tribe XIX.— CELTORHYNCIIIIVI. 



This iiuiiKM'ous tribe consists of small si)ecies of broad form, 

 willi the beak and i)ectoral groove varying according to genus. 

 'J'hey arc distinguished from all the preceding tribes vvitii distant 

 front co.\tc, by the pygidium being i)er[)endicularly defle.\ed, and 

 marked with a deep excavation (Mononychus), or with a con- 

 tinuation of the acute lateral margin of the ventral segments, 

 against which the apical margin of the elytra rests. In the latter 

 case, the ui)per 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 the Cryptorhynehoid series, including Zygupini. 



The antennae are geniculate as usual, inserted about the middle 

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

 pubescent, and aunulated. The side pieces of the mesosternum 

 are usually visible from above. 



They may be divided into four groups, the first of which indi- 

 cates more properly a sub-tribe. 



A. Pygidium without transverse line for reception of tip of elytra ; pectoral 



groove extending upon the nietasternuui. Mononychi. 



B. Pygidium with line for reception of tip of elytra, and carinate in front 



of the line ; 

 Pectoral groove extending behind the prosternum. Cceliodes. 



Pectoral groove anterior, sometimes effacisd ; 



Beak long and slender. Ceutokhynciii. 



Beak stout, usually short. Puytobii. 



Group I. — Mononychi. 



A single genus constitutes this tribe. The species are of broad 

 form, and larger than any others in the tribe, and are easily di.s- 

 tingulshed by the pygidium not being carinate in front, and with 

 no transverse line for the reception of fhe 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, very deep excavation, surrounded 

 by a thickened margin. The eyes are partially covered when 

 the head is deflexed, and the beak, which is long and cylindrical, 

 rests in a deep groove extending through the pro- and meso- 

 siernum, into the metasternum, where it is sharply limited. The 



