318 PHY TOPHAGA, [ Phyllodecta. 
P. vitelline, L. Oblong-oval, a little less parallel than either of the 
two preceding species, of a bronze or greenish-bronze colour, sometimes 
with the elytra coppery, and rarely entirely black ; the regular striz on the 
elytra will at once separate it from P. vitelline, and from P. cavifrons it 
may be known by the characters given above ; in the male the first joint 
of the tarsi is only a little narrower than the third joint. L. 33-45 mm. 
On willows, hazels, poplars, &c,; often found in great numbers under bark in 
winter; very abundant throughout the kingdom. 
HYDROTHASSA, Thomson. 
The species belonging to this and the succeeding genus have been by 
many authors included together under Prasocuris, Latreille; they appear, 
however, to be quite distinct ; in the present genus the form is oval or 
oblong- oval with the under-side almost without pubescence ; the thorax 
is transverse and not margined at base ; the elytra are furnished with 
eight punctured striz, and have an irregular accessory series near sides, 
and the prosternum is not broad between the coxe, and has the process 
mergined ; the two genera together contain fifteen species, which are 
found in Europe, Algeria, South Africa, and North America ; three of 
the six European species occur in britain, 
I. Thorax unicolorous, without reddish-yellow side border. H. auctra, F. 
Il. tae with broad reddish-yellow side border. 
. Form oblong ; qe without longitudinal yellow 
ae on disc . . . H. MARGINELLA, L. 
. Form ovate ; elytra with a longitudinal ‘yellow band 
on disc of sae" ENE the ee side border at 
CTR ye GG _ Sta Se as) os ty is Eo HANNOVER ANA gi 
H. aucta, F. Short oblong oval, convex, of a deep bronze-green or 
bluish colour, sometimes almost black, elytra with the sides broadly 
reddish-yellow ; head and thorax closely and distinctly punctured, 
antenne moderately long, black ; elytra with rather strong punctured 
striz, interstices very finely punctured ; prosternal process strongly mar- 
gined ; legs black, rather stout. L. 25-4 mm. 
Male with the anterior tibia slightly curved, and the first joint of the 
tarsi moderately dilated. 
Damp places by sweeping herbage; somewhat local, but generally distributed 
throughout England; it does not appear, however, to be common in the midland 
counties; Scotland, Solway, Tweed, Forth, Clyde, and Dee districts; Ireland, Dublin, 
&e. 
H. marginella, L. Very like the preceding, but of slightly nar- 
rower and longer form, and less convex ; it may at once be known by the 
broad reddish-yellow side margins of thor: ix ; the punctuation of the head 
and thorax is evidently more diffuse, and the latter is much less trans- 
verse, and not much broader than long; the prosternal process is feebly 
margined, L, 3-4 mm, 
