COLEOPTERA. 401 



These Heteromera will be comprised in a single genus, the 



(EDEMERA, Oliv. 



Where the posterior thighs are strongly inflated in one of the sexes, where 

 the antennae are usually long and smaller at the extremity, and the elytra 

 suddenly narrowed near the end. 

 There are several subgenera. 



The fifth and last tribe of the Stenelytra, that of the RHYNCHOS- 

 TOMA, is composed of Insects, some of which, such as the first, are 

 evidently related by the ensemble of their characters to the (Ede- 

 merae, while the others, in a natural series, appear to belong to the 

 family of the Rhynchophora. The head is considerably prolonged 

 anteriorly in the form of an elongated snout or flattened proboscis, 

 bearing the antennae at its base and before the eyes, which are al- 

 ways entire or unemarginate. These Insects form a single genus, 

 that of 



MYCTERUS. 



In Mycterus properly so called, the body is ovoid, solid, covered by a silky 

 down, and the thorax trapeziform. The abdomen is square, long, rounded 

 posteriorly; the antennae are composed of joints, mostly obconical, the com- 

 plete number of which seems to be twelve, the eleventh or last being ab- 

 ruptly narrowed and acuminated, and the maxillary palpi are terminated 

 by a larger joint in the form of a reversed triangle. 

 The subgenera are Stenostoma and Rhinosimus. 



FAMILY IV. 



TRACHELIDES. 



In our second general division and fourth family of heterome- 

 rous Coleoptera, the head is triangular or cordiform, and borne on 

 a sort of neck or pedicle, abruptly formed, beyond which, being as 

 wide at this point as the thorax, or wider, it cannot enter the cavity 

 of the latter. The body is most commonly soft, the elytra are flexi- 

 ble, without stria3, sometimes very short, and a little inclined in 

 others. The maxillae are never unguiculated. The joints of the 

 tarsi are frequently entire, and the hooks of the last bifid. 



Most of the perfect Insects live on different plants, devour their 

 leaves, or suck the nectar of their flowers. Many, when seized, 



3 A 



