504 INSECT A. 



no hook at their extremity, or but a very small one(l),' and that 

 Hylobius, where there is a very strong one at their inner extr<. 

 mity(2). 



Among the species of the first, one is found on the Tamarisk, — C. 

 tamariscU Fal)., which for beauty of colours rivals the most splendid 

 exotics. It is the type of Schcenherr's genus Coniatus. 



The others, whose mandibles have three or four teeth, present a 

 mentum abruptly narrowed near its superior extremity, truncated, 

 and with scarcely perceptible palpi. Tlieir antennae terminate almost 

 gradually in an elongated fusiform club. The body has frequently 

 a similar figure. Olivier confounded them with the Lixi, from which 

 in fact they differ but little.# 



They will compose the subgenus Cleonus(3). 



The Longirostres, or those whose antennae are inserted. beyond 

 the origin of the mandibles, and frequently near the middle of the 

 proboscis, which is usually long, comprise, with some exceptions, 

 the genus Lixus, lihynchxnus, and Calandra of Fabricius. 



In the two first the antennae present ten joints at least, but most 

 commonly eleven or twelve, of which the three last at least form the 

 club. 



LlXUS, Fab. 



The Lixi almost resemble theCieoni in their organs of manducation, 

 as well as in the elongated fusiform club of their antennae, the nar- 

 row and elongated figure of their body, and the armature of their 

 tibiae. The L. paraplecticics, whose larva lives in the stem of the 

 Phellandrmm and produces in Horses which swallow it with the plant 

 the disease called paraplegia, is almost linear. Another species, for 

 which a particular genus — Rhinocillus — has been formed on ac- 

 count of its liaving but very slightly geniculate antennae, is. reputed 

 an odontalgic(4). 



Rhynch^nus, Fab. 

 The Rhynchaeni present no such ensemble of characters. 



(1) Refer t| it the genera Aterpua, Listroderes, Gronops, Fhytonomus, Coniatus, 

 of ScIiocnheiT. 



(2) To his Hylobii, add also the genera Lepyrua and Chrysohpus. 



(3) To this genus of M. Schcenherr, add tlie following: Pachycerus, Mecaspv 

 Rhytideres, Stenocorhinus. 



(4) The genera Rhinocillus, Lachnaeus, Nerthops, Larinus, Lixus, Pacholenu.' 

 of Schoenherr. The sexual organs of the Lixi presented characters to M. Dufou 

 not observed by him in any other Coleoptera- 



