COLEOPTERA. 503 



Those Brevirostres, in which the penultimate joint of the tarsi is 

 bilobate, but that are apterous and almost always destitute of a scu- 

 tellum, will form other subgenera, viz. Othiorhynchus and Omias, 

 in which the antennal sulci are straight; and Pachyrhynchus, Psa- 

 lidium, Thylacites, and Syzygops, in which those sulci are curved. 

 The Othiorhynci are distinguished from Omias by the auricular 

 dilatation of the lateral and inferior portion of the proboscis, which 

 gives the insertion to the antennae; the Syzygops, or Cyclops of 

 Dejean, by their eyes, almost united superiorly; the Psalidia by their 

 salient and arcuated or crescent-shaped mandibles. The Thylacites 

 are removed from the Pachyrhynci by their attenuated antennae, as 

 long or nearly as long as the thorax, whilst here they are thick and 

 much shorter. The abdomen also is ventricose. To Omias{\) and 

 Thylacites(2) we unite several of the genera of Schoenherr. We 

 may retain that of Hyphantus, closely related to Othiorhynchus{3), 

 but distinguished from it by the thorax, which, compared to the ab- 

 domen, is very large and almost globular. 



Our second general division of the genus Curculio of Fabricius 

 differs from the first in the narrowing of the mentum, which, not 

 occupying the whole width of the buccal cavity, leaves the jaws 

 exposed on each side, and in the mandibles that are evidently den- 

 tated. The club of the antennae is frequently formed by the five or 

 six last joints. 



Some have scarcely more than two teeth in the mandibles. Their 

 labial palpi are distinct. The club of the antennae, which is tolera- 

 bly abrupt, only commences at the eighth or ninth joint, and is not 

 elongated and fusiform. 



The body, although frequently oblong, is not of the same figure. 



Some are apterous, and their tarsi are destitute of pellets. Their 

 penultimate joint is slightly bilobate. 



Such is the subgenus Myniops, Schoenherr, to which may be united 

 his Rhytirrhinus. 



In others, also apterous, the under part of the tarsi, as in most of 

 theRhynchophora,is furnished with pellets, and the penultimate joint 

 is strongly bilobate. They form the subgenus Lipar'us, which will 

 also comprise various other genera of the same author(4). 



Those which are winged may form two other subgenera, viz. Hy- 

 pera, Germ., Phytonomus, Coniatus, Schoenh., where the tibiae have 



(1) The genera Peritelus, Trachyphlceus, Episomus, Pkolicodes, Ptochus, Stomo- 

 des, Sciobius, Cosmorhinus, Eremrtus. 



(2) The Liophlxus, Barynotus, Brachyderes, Herpisticus. 



(3) To this genus add the genera Tylodera and Elytrodon. 



(4) Molytes, Plinthus, Hypporhinus, Epirhynchus, Geophi/us. * 



