242 PHYTOPHAGA. 



Palpi threadlike, last joint nearly cylindrical or some- 

 what oval; antennae thickened toward apex, sawlike or 

 comblike (in Urodon with three-jointed club) ; pygidinm 

 not covered. Bruchidae. 



h. Head not produced into a rostrum. 



I. Head constricted behind ; thorax much narrower 

 at base than elytra. 



1, Apex of mandibles entire. 



Labrum bilobed ; antennae inserted before eyes. 



Sagridae. 



2, Apex of mandibles bifid or trifid. 



A A, Eyes round. 



Antennae long ; inserted before eyes ; first abdominal 

 segment as long as the rest together ; legs long. 



Donaciidae. 

 S S. Eyes emarginate. 



Antennae inserted within front inner margin of eyes. 



Crioceridae. 



II* Head not constricted behind ; thorax not much 

 narrower at base than elytra. 



1, Posterior femora not thickened ; insects without 

 power of leaping. 



A A. Head vertical. 



a a. Antennae short, sawlike, or with larger 

 apical joints. 



Thorax double as broad as long, eyes round or oblong. 



Clythridae. 

 b b. Antennae long, threadlike. 



Elytra not entirely covering pygidium ; eyes kidney- 

 shaped. C ryptocejplialidae. 



JB a. Head more or less prominent. 



a a. Antennae not long, placed somewhat 

 apart and slightly thickened toward apex. 



Palpi short ; eyes oblong ; legs equal in size ; tibiae 

 without apical spines ; body hemispherical or oval. 



Chrysomclidae. 



h b. Antennae long, placed closed together, 

 not thickened toward apex. 



