132 COLEOPTERA OF NORTH AMERICA. 



Anterior coxal cavities closed behind ; tarsi with the third joint lobed ; 

 Fourth tarsal joint not smaller than the third. Hemipeplin/;?. 



Fourth tarsal joint very small. Telephanin^.. 



Sub-Family I.— SILVANIN^. 



In this sub-family are contained but two g-enera, having the 

 gense prominent and acute; the antennae with the first joint not 

 elongated, and the outer ones enlarged; the anterior coxal cavi- 

 ties are broadly closed behind, and the tarsi, 5-jointod in both 

 sexes, have the fourth joint small. 



The genera are two in uumber, and the species, which are of 

 small size, are found under bark or in grain. 



Antennae with the joints 9-11 somewhat suddenly larger. Silvanus. 



Antennae with outer joints gradually enlarged. Nausibius,. 



The type of the last genus is N. dentatua, having several large 

 teeth on the sides of the thorax. It has been diffused over tlie 

 whole globe in articles of commerce. 



Sub-Family XL— FASSANDRIN^. 



In this sub-family the maxill® are concealed by large corneous 

 plates, which vary in form according to the genus. The hind 

 tarsi are 5-jo.inted in both sexes. The front coxal cavities are 

 open behind. 



•Jugular jilates broad, rounded in front : 



First tarsal joint short. Catogenus. 



First tarsal joint not shorter. Scalidia. 



-Jugular plates narrow, very long, acute. Prostomis. 



Coiogenvs rufus varies greatly in size, and occurs in the 

 Atlantic region: Scalidia linearin in Lower California and in 

 Louisiana (?): ProatomiH americana Crotch is found in Cali- 

 fornia, and scarcely .differs from the European P. mandibularia. 



Sub- Family III.— CUCIUIN.E. 



In this sub-family the anterior coxal cavities are open behind, 

 afid the base of the maxillee is exposed. The tarsi are filiform, 

 either 5-jointed, or with the hind ones of the males 4-jointed. 



