302 PHYTOPHAGA. [ Chrysomela. 
the legs and tarsi are rather stout, and the latter are more or less dilated, 
especially in the males ; the males, moreover, are usually smaller and 
narrower than the females, and have the last segment of the abdomen 
subtruncate, sinuate or impressed. 
The larvee of Chrysomela are of longer or shorter oval form with narrow head and 
thorax and strongly widened abdomen which is very convex; the upper surface is 
smooth or slightly pubescent and variously coloured; they differ from Zimarcha in 
having nine pairs of stigmata instead of eight ; they feed on various plants, to which 
they sometimes do considerable damage by eating large holes in the leaves. 
There are sixteen British species belonging to the genus, which may 
be roughly distinguished as follows :— 
I. Elytra with the margins broadly yellowish-red or red 
and not metallic. 
i. Elytra confusedly and rugosely punctured; size 
larger. 
1. Form longer ; sculpture of elytra more confluent C. sAN@UINOLENTA, L. 
2. Form shorter ; sculpture of elytra less confluent . C. MARGINALIS, Duft. 
(distinguenda, Steph.) 
ii. Elytra finely punctured with distinct rows of larger 
pn | oO ge Cte | Ol) OO eS 
II. Elytra unicolorous, or with the side margins metallic. 
j. Thorax with the side margins strongly raised. 
1. Elytra bronze, reddish-bronze, or brownish-red. 
A. Thorax and elytra concolorous. 
a. Size larger; upper surface metallic, with 
coarse and irregular punctuation. . . . . C, BANxsI, F. 
b. Size smaller ; upper surface not, or scarcely, 
metallic, with more or less irregular rows of 
rather fine punctures. . . . - + - « . C. STAPHYLEA, L. 
B. Thorax golden green . . . ~ « © = « C. pouita, L. 
2. Elytra steel-blue with very regular single rows of 
rather large punctures. . . . - . « « + ~ C. ontcHatcra, Mill. 
(lanvina, F.) 
C. MARGINATA, L. 
ii. Thorax with side margins not, or slightly, raised. 
1. Elytra with more or less regular double rows of 
moderate punctures on disc ; colour steel-blue . . C. HmMOpTERA, L, 
2. Elytra irregularly punctured. 
A. Form short, subglobose. 
a. Colour very variable; punctuation coarser ; 
SizeisMalleryawioaks Wet uclaes 175) Ml-pees tment 
b. Colour deep violet ; punctuation finer; size 
ga :| Ieee Pee ey re Me Ee er nmer we Cree 
B. Form more oblong, as a rule, more depressed, 
but sometimes strongly convex. 
a. Colour brilliant golden green, unicolorous, or 
partly bluish or coppery. 
a*, Thorax with disc more coarsely punctured, 
and with sides distinctly narrowed in 
front, broadest at base; elytra unicolor- 
ous; length 7-9mm.. . ...-. . 
b*, Thorax with dise more finely punctured, 
and with sides not, or scarcely, narrowed 
in front, broadest about middle, or as 
broad in middle as at base. 
C. VARIANS, Schall. 
C. G@OETTINGENSIS, L. 
C, MENTARASTI, Suffr. 
