103 COLEOPTERA OF NORTH AMERICA. 



as to meet the pro-sternum ; the hind coxae do not attain the sides 

 of the body. The species live on dried animal matter. 



Group II. — Attageni. 



The frontal ocellus is distinct; the cavities for the reception of 

 the antennae are faint; the prosternum is prolonged behind, and 

 its point enters the channelled mesosternum, which is protuberant 

 in Attagenus megatoma, and declivous in the other species, but 

 not very wide ; the middle coxae are consequently not very widely 

 separated; the hind coxae almost attain the sides of the body. 

 The species live on dried animal matter. 



Our species are two, and in neither is the prosternum lobed : — 



Antennae 11-jointed ; first joint of tarsi short, second longer. Attagenus. 

 Antennae 9-jointed ; first joint of tarsi longer than second. Dearthrus. 



Dearthrus is founded upon a small, elongate, finely pubescent 

 insect from the Southern and Western States ; the color is black ; 

 the legs are ferruginous. Of Attagenus two species, A. peUio 

 and A. megatoma, have been introduced from Europe ; two others 

 are found in New Mexico. 



Group III. — Anthreni. 



In this group the frontal ocellus is distinct ; the prosternum is 

 prolonged behind, and fits into the very short and sometimes 

 divided mesosternum; the antennal cavities are very deep and 

 distinctly limited in Anthrenus and Cryptorhopalum, shallow in 

 Trogoderma, and badly defined in Apsectus; the middle coxae 

 are widely separated by the anterior part of the metasternum ; 

 the hind coxae do not attain the sides of the body. The larvae 

 of most of the species feed on dried animal matter, the perfect 

 insects are found in flowers. 



Our genera are thus separated : — 



Mesosternum emarginate or divided ; prosternum pointed behind ; 

 Mandibles and labrum not covered by the prosternum ; 

 Antennal cavities extending along the margin ; body pubescent. 



Trogoderma. 

 Mandibles covered, labrum not covered ; 



Antennal cavities extending along the margin ; body pubescent. 



Cryptorhopalum. 

 Antennal cavities at the anterior angles ; body clothed with scales. 



Anthrenus. 



