372 RHYNCHOPHORA. . [ Rhinoneus, 
constricted in front, with a central channel and a lateral tubercle on 
each side, anterior margin scarcely raised ; elytra with evidently deeper 
and stronger strie and more convex interstices than in &, castor, with 
the asperities more remote. L. 2-25 mm. 
Male with the posterior tibiee armed with a hook. 
Marshy places; by sweeping herbage; also in flood refuse; according to Bedel 
it is attached to species of Polugowum ; the larva has been observed by Buddeberg 
in the stems of P. lapathifolium vars. nodosum and incanum; not common; 
Wimbledon (Champion) ; Horsell (Power) ; Ashwicken, Norfolk (Power) ; London 
district and Bristol (Stephens) ; I have found a few specimens at Lincoln in flood 
refuse in autumn, but know of no record further north. 
R. denticollis, Gyll. A small and inconspicuous species which 
may be known from all the preceding by the fact that the anterior 
margin of the thorax is furnished with two raised tubercles in middle 
placed near one another; oblong ovate, convex, black, antenne and legs 
more or less ferruginous, the tibie being always reddish ; underside 
thickly coyered with greyish scales, of which there is also a pateh at the 
base of suture of elytra; the rest of the upper surface in fresh specimens 
is sprinkled with whitish scales, but they are very easily rubbed off as 
appears also to be the case with the scutellary patch ; thorax compara- 
tively long, very coarsely punctured, scarcely at all constricted in front 
and with a central channel and a rather strong lateral tubercle on each 
side behind ; elytra with rather deep punctured striz, interstices rather 
convex, finely rugose or scratched ; legs moderately long. L. 15-2 mm. 
Chalky and sandy places by sweeping herbage ; sometimes found in moss; rare ; 
Loadon district, rather widely distributed but always rare, Shirley, Mickleham, 
Forest Hiil, Box Hill, Chattenden, Walton-on-Thames, Chatham ; Hythe; Holm 
Bush, Brighton; New Forest ; Windsor Forest, rare (S. Stevens). 
This species is most closely allied to Phytobius quadrinodosus from 
which, according to M. Bedel, it ean only he distinguished by the 
generic characters ; my single specimen, however, is very different in 
appearance, having the sides of the thorax much straighter, with the 
surface more coarsely and less closely punctured, and the elytra much 
narrower in proportion to the thorax, with the shoulders rounded and 
not prominent and the interstices much less asperate ; the striz also are 
deeper and more strongly punctured. 
EUVUBRYCHIUvS, Thomson. 
The single species which forms this genus occurs both in Europe and 
North America, and is distinguished from the two following, which 
resemble it in their aquatic or subaquatic habits, by having the tibize 
and tarsi furnished sparingly with long natatory cilia; the tarsi are 
elongate, with the three first joints compressed and not tomentose 
beneath, and the last very long ; the tarsal claws are simple and stout; 
the anterior coxie are almost contiguous ; the antenne are ten-jointed, 
