246 



COLEOPTERA OP NORTH AMERICA. 



emarsdnate, and clothed beneath with a dense brush of hairs ; 

 claws simple. 



This family is represented in our fauna by three species from 

 the Atlantic States ; they are found under bark and on leaves ; 

 they belong to a tribe, Statyrini, to be distinguished from the 

 genuine Lagriini by the sixth ventral segment being visible, and 

 the last joint of the antennas elongated. Two genera are indi- 

 cated : — 



Head scarcely constricted behind (elytra not striate). Arthkomacra. 



Head strongly constricted behind (elytra striate). Statyra. 



To Arthromacra belongs only Lagria senea Say (Arthrom. 

 donacioides Kirby). 



There is absolutely nothing in the preceding formula which 

 can be relied on as distinguishing this family from the Tenebrio- 

 nidae, except the prominent anterior coxas, and the dilated penul- 

 timate joint of the tarsi ; the larva? are nevertheless very different, 

 and it is chiefly owing to a knowledge of that fact that the two 

 families are retained as distinct. 



Fam. ll— monommidae. 



Mentum moderate in size, somewhat rounded, supported 

 by a broad gular ^process ; gular fissures narrow; ligu la cor- 

 neous, somewhat prominent behind the mentum ; labial palpi 

 '6 -jointed. 



Maxillae with two flattened ciliated lobes ; palpi 4-jointed, 

 last joint truncate. 



Head horizontal, prominent, received in the thorax as far 

 as the eyes, which are large, transverse, and strongly granu- 

 lated; front flat, rounded anteriorly; labrum short, scarcely 

 prominent ; mandibles short, emarginate at tip. 



Antennas inserted under the frontal margin, received in 

 grooves on the under surface of the prothorax, 11 -jointed ; 

 last three joints larger, forming an oval flattened club. 



Prothorax gradually narrowed from base to tip, as wide 

 at base as the elytra ; lateral suture distinct ; flanks with a 

 deep curved groove from the front to the hind angle for the 

 reception of the antennae ; prosternum broad, rounded be- 

 hind, fitting closely to the mesosternum ; coxal cavities very 

 small, closed behind by the mesosternum. 



Mesosternum broad, side pieces not extending to the coxal 



