264 
BRITISH BEETLES. 
straggling limbs ; it is remarkable as having the pos- 
terior coxae reaching to the base of the second ventral 
segment, and dividing the first, which is very short, 
into three separate parts. 
Mononychus pseudacori, a larger, awkward-looking, 
dull black creature, with a white spot beneath the 
scutellum, has very clumsy legs, — of which the tibiae 
are obtusely and coarsely toothed on the outer side 
below the middle, — and only a single claw to the 
apical joint of each tarsus. Its larva feeds in the pod 
of the wild iris, and is taken in August, chiefly in the 
Isle of Wight. 
In Litodactylus and its allies, all more or less 
attached to water-plants (some even existing under 
water, on Myriophyllum, and swimming with their 
hind legs in the same fashion as the Dytiscidse), the 
rostrum is short and thick, the scutellum inconspicuous, 
and the eyes large and prominent; and in Ceuthor- 
rhynchus, a very extensive genus of small convex 
species, the rostrum is long, arched, and slender. 
Some of this genus (which is divided into two sections, 
the first having tho femora simple beneath, whilst in 
the second they are toothed) are prettily variegated 
with white scales ; others are metallic blue, or set 
sparingly with short stiff bristles. 
Many of them are very abundant, and do con- 
siderable damage to culinary vegetables, either — as 
perfect insects — by piercing holes in them, or — as 
larvte — by forming gall-like excrescences on their 
roots. As is frequently the case, there is another 
genus ( Ceuthorrhynchid/ius ), closely resembling this, in 
which there are six instead of seven joints to the 
funiculus. 
