INSECTA, 571 



luris, Tentyria, Hcgestcr, Eurychora, and Akis Others 

 have the extremity of the maxillary palpi enlarged, or secu- 

 ri-form. In the ASIDAD<E, the base of the maxillae is con- 

 cealed by a large mentum, as Asida and Chiroscelis. In the 

 Blapsidae, the base of the maxillae is exposed, as in Blaps, 

 Misolampus, and Pedinus. 



The genera, in which the maxillae are destitute of a cor- 

 neous tooth on the inner side, are likewise numerous. 

 Many of these have the antennae cylindrical, or slightly 

 tapering. The Melandriadae have the penultimate joint of 

 all the tarsi bilobate, as Melandria, Lagria, Calopus, No- 

 thus, Odemera, Stenostoma, and Rynomacer. In the He- 

 lopsidae, the joints of the tarsi, at least those of the hind 

 legs, are entire, as Helops, Serropalpus, Hallomenus, Py- 

 tho, Nilio, and Cistela. Others have the antennas more or 

 less club-shaped, and generally perfoliated. The Heleadst, 

 including the genera Helea and Cossyphus, have the head 

 concealed, or received into a notch in the front of the tho- 

 rax. The remaining families have the head exposed and 

 projecting. In the Diaperidae, the insertion of the anten- 

 nae is concealed by the lateral margin of the head, as in Dia- 

 peris, Hypophleus, Trachyscelis, Eledona, Cnodalon, and 

 Epitargus. In the Leiodesidae, the insertion of the anten- 

 nae is exposed, as in Leiodes, Tetratoma, Eustrophus, and 

 Orchesia. 



III. COLEOPTERA TETRAMERA. The tarsal joints of all 

 the feet are four in number. They are phytivorous, and 

 live chiefly in wood or on flowers. In one extensive group, 

 the head is produced in front, in the form of a snout. 

 Among these there are two genera, Bruchus and Anthri- 

 bus, in which the snout is short, and the labrurn and palpi 

 distinct. In the remaining genera the snout is long, and 

 the labrum and palpi obscure. In the Curculionida?, in- 

 cluding the genera Curculio, Rhynchacmis, Cionus, Calan- 



