404 COLEOPTERA OF NORTH AMERICA. 



Fam. LXVI.-CEDEMERIDAE. 



Mentum trapezoidal, slightly narrowed in front, supported 

 by a large gular process; ligula large, prominent, bilobed ; 

 labial palpi 3-jointed. 



Maxillaj with large exposed base, and two flattened cilated 

 lobes; palpi -i-jointed, last joint dilated in our genera. 



Head slightly inclined, gradually, but not strongly nar- 

 rowed behind, received into the thorax not as far as the 

 eyes, which are tolerably strongly granulated in Calopus, 

 but more finely in our other genera; front somewhat pro- 

 longed; epistoma subcoriaceous; labrum prominent ; man- 

 dibles emarginate at tip, furnished on the inner margin with 

 a membranous ciliated border. 



Antennaj 11-jointed, nearly filiform, sometimes serrate. 



Prothorax narrower at the base than the elytra, lateral 

 suture wanting; coxal cavities widely open behind, con- 

 fluent. 



Mesosternura pointed behind; side pieces extending to the 

 coxal cavities, which are generally confluent; metasternum 

 long; side pieces narrow. 



Elytra covering the abdomen ; epipleuras almost wanting; 

 visible only near the base. 



Abdomen with five free ventral segments, the 6th some- 

 times visible in the males. 



Legs moderate; anterior coxas large, conical, contiguous; 

 middle coxa:^ conical, contiguous or slightly separated, some- 

 times with distinct trochantin ; hind coxos transverse, nearly 

 contiguous; tibial spurs distinct; anterior and middle tarsi 

 5-jointed ; hind tarsi -i-jointed ; the penultimate joints dilated 

 in our genera, and furnished with a dense brush of hairs be- 

 neath; claws simple, slightly dilated at the base. 



Insects of modcrnte size found arenorally upon plants, though 

 some species of Asclera live near water on the ground. 

 Our genera are as follows: — 



Antennae partly surrounded by the eyes : middle coxae not contiguous. 2. 

 Antennfe not embraced by the eyes ; middle coxae contiguous. 3. 



2. Clypeal suture not obvious. Calopus, 

 Clypeal suture very distinct. Microtonus. 



3. Body slender. 4. 

 Body stout, tarsi with joints 2-4 spongy beneath. Ditylus. 



4. Front tibife with one spui'. ■'i. 

 Front tibiae with two spurs. 6. 



