116 C0LE0PTERA OF NORTH AMERICA. 



Abdomen with five (in our genera) free ventral segments. 



Anterior and middle coxae conical, prominent, the former 

 with large trochantins; posterior coxae transverse, dilated 

 into a small plate partly covering the thighs. 



Legs moderate, tibiae with small terminal spurs; tarsi 5- 

 jointed ; claws simple; onychium long, hairy. 



A family containing a small number of species, found on plants ; 

 Sandalus especially affecting various cedars ; it is represented 

 both in the Atlantic and Pacific districts ; Zenoa contains but one 

 species in the Atlantic district. 



Tarsi not lobed ; antennse moderately long, serrate. .Zenoa. 



Tarsi lobed ; antennse short ( <j> serrate, % ilabellate). Sandalus. 



These two genera indicate different tribes, distinguished as 

 above stated, by the form of the side pieces of the metathorax. 



Fam. xxxviil— schizopodidae. 



Mentum quadrate, corneous; ligula short, transverse, cori- 

 aceous; palpi 3-jointed. 



Maxillae exposed at base, lobes ? palpi 4-jointed, 



short, cylindrical. 



Antennae inserted immediately in front of the eyes, under 

 a slight prominence; 11-jointed, serrate from the fifth joint 

 outwards. 



Head deflexed, closely affixed to the prothorax, eyes ellip- 

 tical; epistoma not distinct from the front; labrum emar- 

 ginate ; mandibles stout, emarginate, not prominent. 



Prothorax with the side pieces not separate ; coxal cavities 

 rounded, almost confluent with the middle coxal cavities; 

 prosternum slightly prolonged, truncate at tip. 



Mesosternum short, oblique; epimera attaining the coxae. 



Metasternum short, side pieces wide; epimera slightly 

 visible. 



Elytra covering the abdomen ; epipleurae obsolete behind. 



Abdomen with the first and second ventral segments con- 

 nate ; the fifth emarginate, sixth deeply emarginate, seventh 

 contained in the emargination of the sixth, slightly visible. 



Anterior coxa3 conical, without trochantin; middle coxas 

 rounded, without trochantin ; posterior coxae transverse, 

 somewhat separated, extending to the margin of the body, 

 dilated into a plate partly covering the thighs. 



Legs moderate, slender; anterior tibias with one short apical 



