Lubrychius.] RHYNCHOPHORA. 373 
with the club elongate, and are inserted in the middle of the rostrum ; 
the thorax is obsoletely channelled and furnished with four tubercles ; 
this insect and Litodactylus leucogaster in both the larval and perfect 
state appear to live almost entirely under water; they resemble the 
species of Phytobius in constiucting cocoons in which to undergo their 
final transformations, but differ from them in the fact that they form 
their cocoons on their food plant under the surface of the water, whereas 
the species of Phytobius construct them above the surface ; the follow- 
ing note on the habits of the species was published by myself in the 
Entomologist’s Monthly Magazine, xxii. p. 186 :—‘ At the November 
meeting of the Entomological Society, Mr. C. O. Waterhouse exhibited 
some living specimens of Hubrychius velatus, Beck., in order to show 
that they swim with their hind legs after the fashion of a Dytiscide, 
or a frog; these specimens he kindly gave me after the meeting, and I 
kept them alive for some time ; they were not only able to swim on 
the surface but could dive beneath it, and although their natural 
buoyancy appears to force them upwards yet they are able to dive quite 
far enough to seize the aquatic plants, to which they cling, in case they 
do not project above the surface ; if they do, they prefer to seize them 
near the surface and crawl down them; a short while afterwards Mr. 
J. J. Walker sent me two living Litodactylus leuwcogaster ; these swim 
in exactly the same way as LH. velatus, except that their buoyancy 
seems to be somewhat greater, and their power of diving below the sur- 
face somewhat less in consequence. These sub-aquatic Curculionide 
seem to be able to sustain life under water as well as, if not better 
than, the Dytiscide. As I was going from place to place at the time 
Mr. Waterhouse gave me his specimens, they were often corked up ina 
small tube of water for many hours together, but did not seem to be 
any the worse.”” 
E. velatus, Beck. (aguaticus, Thoms.). Short, convex, black, 
thickly clothed both on the upper and underside with greenish yellow 
seales, which become much duller after death; the head, sides and 
central line of thorax, and sides and suture of elytra are more closely 
covered than the rest of the upper surface, which is darker, and except 
in quite fresh specimens, more or less denuded ; antennz and legs clear 
yellow, except the extreme apex of the former, and the knees and apex 
of part of the tarsal joints and of the claws, which are black ; thorax 
broader than long, narrowed in front, but not constricted, very closely 
punctured, obsoletely channelled, with two small tubercles on anterior 
margin, and a larger one on each side before base; elytra short and 
broad, much broader than thorax, with the shoulders rounded but 
prominent and well marked, striz deep, interstices broad, the fifth 
somewhat raised at base; legs long, L. 2-25 mm. 
In stagnant or slowly moving water; on aquatic or sub-aquatie plants, 
especially Potamogeton, Hippuris and Myriophyllum; the larva has been observed 
