368 RHYNCHOPHORA. [ Tapinotus. 
Dr. Powev’s specimen was taken by the Rev. Laundy Brown at Horning Fen, Norfolk, 
in 1838; it appears to be spread over Central and Northern Europe and Siberia. 
RHYTIDOSOMUS, Schonherr. 
Three species are known as belonging to this sub-genus, one from 
Greenland and two from Europe; the single British species is a small 
round convex black insect, which may be known from all the other 
sub-genera of Ceuthorrhynchus, except Poophagus, by not having the 
elytra so strongly and more roundly cut back at shoulders ;* from the 
last named sub-genus it may easily be separated by its shape as well 
as by the six-jointed funiculus of the antenne ; the rostrum is stout 
and is received in arather shallow fovea on the mesosternum ; the tibiee 
are broad and the tarsal claws are armed with a tooth; the prosternum 
is enlarged behind the anterior femora, and the interstices of the elytra 
are narrow and subcostiform. 
R. globulus, Herbst. Short and broad, convex, subglobose, black, 
rather shining, with the underside and, as a rule, the basal portion of 
suture, thickly clothed with white scales; rostrum stout; antenne 
black, pitchy or pitchy red at base ; thorax comparatively long, coarsely 
punctured, constricted before apex, with a broad central furrow at base ; 
elytra with very broad and strong coarsely punctured stria, interstices 
much narrower than the striae, convex, somewhat asperate behind ; legs 
black, rather stout. L. 13-13 mm. 
Male with all the tibia armed with rather a large hook ; abdomen 
with the first and second segments broadly impressed. 
On sallows ; according to M. Bedel it is found on the shoots of Populus tremula 
and P. alba; rare; Coombe Wood, Surrey (Stephens); Hampstead (Power) ; Hamp- 
stead and Wimbledon Common (S. Stevens); New Forest (Power); Langworth 
Wood, Lincoln, where I captured a pair by general sweeping on September 26th, 
1881; Northumberland district, Wallington (Power). 
AMALUS, Schonherr. 
This genus forms a sort of transition between Ceuthorrhynchus and 
its allies and the Rhinoneus group; it resembles the former in the 
greater length of the rostrum, but differs in the formation of the 
prosternum, which is reduced to a narrow border before the anterior 
cox and is not incised at throat; the anterior coxe are almost con- 
tiguous and the rostrum is not received in a groove ; the antenne are 
ten-jointed ; the thorax is not constricted at apex and has neither 
tubercles at sides nor a central channel; the femora are simple and the 
tarsal claws are armed with a sharp tooth ; both the described species 
are found in Europe, and one occurs locally in Britain. 
* This character is not so obvious in this species as in Poophagus and is, perhaps, 
rather misleading ; the emargination, however, is blunter, and the sides of elytra 
near it more rounded than in Ceuthorrhynchus. 
