268 PHYTOPHAGA, 
A. Disc of thorax finely or very finely strigose, 
not or scarcely punctured. 
a. Posterior femora very long, reaching apex 
of elytra ; posterior Hoe of male with 
prominences on their inner side ; average 
size larger . 
b. Posterior femora shorter, not reaching 
apex of elytra; posterior tibie of male 
without Pa eres average size 
Smlalleruees ae 
B. Dise of thorax more or less plainly pune- 
tured and coarsely strigose. 
a. Elytra broader and less narrowed behind ; 
posterior femora of female with only one 
SeenON 4 ¢ oo 6 0 6 
b. Elytra narrower and more narrowed 
behind; posterior femora in female with 
two teeth, the inner one being small 
2. Posterior femora of male with one tooth on 
their under-side. 
A. Posterior femora longer, reaching apex of 
elytra, each of which is furnished on each 
side with one impression before middle near 
suture, and a broad longitudinal purple- 
red stripe (sometimes more or less ee 
near suture 
B. Posterior femora shor ter, not reaching apex 
of elytra, which are furnished with two or 
more distinct impressions. 
a. Elytra with a longitudinal band at sides, 
anda spot at base purplered . . 
b. Elytra unicolorous, or slightly darker 
on dise, without distinct bands or 
markings. 
a*. Interstices of strie of elytra rather 
thickly set at base with large punc- 
tures ; average size larger. 
af. Upper surface golden green ; elytra 
with six well-marked impressions on 
each, situated both near suture and 
at sides ; central furrow of thorax 
deeper eve ce oc. ne Mee ee Le ae ee ts 
bt. Upper surface obscure brownish- 
bronze, with distinct impressions 
near suture, and at most one dis- 
tinct longitudinal impression at 
sides ; central furrow of thorax less 
marked’; s+, cust) deeds Citepe ey 
[ Donacia. 
D. CRASSIPEs, F. 
D. SPARGANII, Ahr. 
D. VERSICOLOREA, Brahin. 
(didens, Ol.) 
D. DENTATA, Hoppe. 
I. DENTIPES, F.* 
D. trmBata, Panz. 
(lemne, F.) 
D. BiconoRA, Zsch. 
(sagittarie, I.) 
D. opscurA, Gyll. 
* The name D. aquatica, L., ought, apparently, to be applied to this insect, but 
the name aquatica has been given to so many of the species that it is best omitted 
altogether, 
