260 PHYTOPHAGA— CRYPTOCEPHALIDAE. 



Black; base of antennae, under-side of head, a large 

 frontal spot, anterior margin of thorax and legs yellow, 

 femora brownish ; scutellum of male yellow. Thorax 

 smooth ; elytra with close punctured striae. L. 1 — 1|- 1. 

 Scarce. C. frontalis, Marsh. 



CHM YSOMELIDAE. 



A, All tarsal joints equal in breadth ; insects apterous. 



Anterior coxae placed only slightly, hinder pairs far 

 apart ; tibiae without grooves for reception of tarsi. 



Timarcha, Eedt. 



S, Second tarsal joint narrower than first ; insects winged. 



a. Body not elongate. 



I, Antennae threadlike or gradually thickened. 



1» Tarsal claws simple, 



A A. Tibiae without furrows on outer-side, or 

 if furrowed, thorax almost as broad at base as 

 elytra. 



Antennae reaching beyond base of thorax, sometimes 

 threadlike ; mesosternum short, excised in front ; anterior 

 coxae placed apart. Chrysomela, Lin. 



_K jB. Posterior tibiae furrowed on outer-side ; 

 thorax narrower at base than elytra. 



Antennae scarcely reaching beyond base of thorax, con- 

 siderably thickened toward apex ; mesosternum very short, 

 excised in front; anterior coxae placed apart. 



Lina, Eedt. 



2, Tarsal claws toothed at base. 



Antennae as long as half the body, gradually thickened ; 

 mesosternum very short ; anterior coxae almost contiguous ; 

 tibiae more or less furrowed on outer-side, toothed on outer- 

 side of apex. Gonioctcna, Eedt. 



II, Antennae more or less distinctly clubbed. 



1, Posterior tibiae toothed on outer-side of apex. 



Antennae scarcely reaching middle of body, the last six 

 joints forming a sort of elongate club ; mesosternum narrow, 

 triangular and pointed ; anterior coxae placed very close 

 together, Gastrojjhysa, Chevr, 



