CURCULIONIDAE. 493 



prothoracic lobes. The prosteinum is suddenly and very deeply 

 eraargiuat(! in i'ront, and the antecoxal ridges defining- the pectoral 

 groove are acute and elevated in all our species. 



The beak is stouter and more coarsely sculptui'cd in %, and the 

 last ventral segment is impressed. The species in our fauna are 

 not very numerous, and, with the exception of Ehyti(U)i^onnti> 

 orobinus Schiodte, from Greenland, which is unknown to us, all 

 belong to Ceutorhynchus, and occur on both sides of the conti- 

 nent; some European species with 6-jointed funicle have been 

 separated under the name Ceutorhynchidius, but we see nothing 

 in our species sufficient to warrant the adoption of such a division. 

 Rhytidosomus differs from Ceutorhynchus chiefly by the sub- 

 globose elytra; the funicle is G-jointed. 



Group IV. — Phytobii. 



The species of this group differ from the Ccutorhynchi only by 

 the beak being stout, and usually short, in one instance scarcely 

 as long as the prothorax. The jjrothoracic lobes are feeble or 

 wanting, the eyes are sometimes partially covered in repose, 

 sometimes entirely free. The pectoral groove is sometimes well 

 defined by antecoxal ridges on the prosternum, but occasionally 

 these are absent. The first genus exhibits a very singular rever- 

 sion towards the Bagous group, with which it might indeed be 

 placed, were it not that the pygidiuni is exposed and similar in 

 sculpture to that of the other members of the present tribe, and, 

 also, that other characters correspond with the position here 

 assigned to it. 



The genera are somewhat difficult to define, in consecpience of 

 the important structural characters by which the species are dis- 

 tinguished. It is probable that they will be increased in future, 

 by those whose views tend to the multiplication of genera, but 

 for the present, the divisions here adopted express both conve- 

 niently and naturally the affinities of the species known to us. 



Tar.si with tlii> tliird joint dilated, liilobed. 2. 



Tarsi slander, long, not diltatcd. Phytobius. 



2. Prosternum with acute antecoxal rid<;;,>s. :]. 

 Prosternum without acute antecoxal ridges. Pelenomus. 



3. Eyes with acutely elevated orbits. Ccelogaster. 

 Eyes without acutely elevated orbits. Rhinoncus. 



