Chrysomelina.} PHYTOPHAGA. 299 
posed of five ventral segments ; the general form is oval and convex, and 
many of the species are very brilliantly coloured (hence their name), but 
they differ very considerably in both these characters. In the following 
table I have entirely dropped the characters drawn from the tarsal joints, 
and have adopted more simple ones which may not in all cases be of 
universal application, but will for the most part enable the British 
genera to be distinguished with more or less ease. 
I. Anterior coxal cavities closed behind; metasternum 
very short. . . Seon th oe ee UMAR OLAS gatas 
a Anterior coxal cavities open behind. 
. Prosternum without distinct process behind ; thorax 
" pakeined at base; tibiae produced into a_ tooth 
externallyatiapexs i) n= ier) a) ene ae NGASTROIDEA, Hope: 
(Gastrophysa, Redt.) 
ii. Prosternum with a distinct process behind. 
1. Elytra with their inner posterior margin very 
finely ciliated ;* form ovate or short ovate and 
convex ; abdomen with the first ventral Sy taba 
longer than the metasternum . . . CHRYSOMELA, L, 
2. Elytra with their inner posterior margin not 
ciliated. 
A. Tarsal claws toothed. 
a. Tibiw, at least the posterior pair, produced 
externally into a more or less strong tooth at 
NOS 5 6 o 6 5 6 6 6 6 5 6 6 o nb JMIRAMO MIRON ORAL 
(Gonioctena, Redt.) 
b. Tibize not produced externally into a tooth at 
SERS | 6 6 pb of bo 6-6 8 6 6 6 Oo JelsivannonersonMmn, OnE 
(Phratora, Chevr.) 
B. Tarsal claws simple. 
a. Elytra not punctured in distinct rows, usually 
confusedly punctured. 
a®. Elytra with the epipleure not es 
inflexed, almost flat; size larger . . . MeEwasoma, Steph. 
(Lina, Redt.) 
b*. Elytra with the epipleure strongly and 
sharply inflexed against the under-side ; 
size smaller (facies of Phewdon) . . . . PLAGIODERA, Redé. 
b. Elytra punctured in distinet rows. 
a*, Form short oval and convex . . . . PH#DON, Latr. 
b*. Form oblong, elongate-oblong, or oblong 
oval. 
at. ‘Thorax transverse, not margined at base; 
form shorter . . . . Hyprornuassa, Thoms. 
bt. Thorax subquadrate, margined at "base ; ; 
fOorMMLON Sera) vee en lt ERASOOURIS eats 
TIMARCHA, Laitreille. 
This genus contains about a hundred species, which are chiefly confined 
* This character in some species is very marked, under a high magnifying power, 
but in others is less evident and sometimes requires the removal of the elytra for its 
proper examination. 
