Pentarthrum.] RHYNCHOPHORA, 391 
PENTARTHRUM, Wollaston. 
This genus contains three species, one from St. Helena, another 
from Ascension Island, and a third which is found in England and 
France on both sides of the English Channel ; they may be known by 
the five-jointed funiculus of the antenne ; the rostrum is moderately 
long and robust, not dilated at apex as in Cossonus, with the scrobes 
deep and commencing in middle; club of antennz small; scutellum 
small but distinctly visible; mesosternum rather broad. 
P. Huttoni, Wollaston. Reddish brown, or pitchy, with the head 
and thorax often darker than the elytra, rather shinirg, glabrous, 
antennz and legs ferruginous, rostrum longer than the head, eyes 
slightly prominent ; antenne with the funiculus five-jointed ; thorax 
considerably longer than broad, narrowed in front and constricted before 
apex, strongly punctured, less closely on disc than at sides, broadest 
near base ; elytra cylindrical, with deep roughly punctured strie, which 
are at least as broad as the interstices; interstices punctured; tarsi 
with the third joint bilobed. L. 23-31 mm. 
Male with the rostrum thicker and plainly punctured at base. 
Female with the rostrum less thick, very shining, and almost 
smooth, 
In damp and decaying wood, especially of casks, &e.; very local; Plymouth 
(J. H. Keys); Portsmouth district (H. Moncreaff) ;* Portland; it has also been 
recorded from Alphington (Devon) and Plymouth in dead cherry wood. 
COSSONUWS, Clairville. 
This is a large and important genus containing upwards of a hundred 
species, of which three only occur in Europe, and one in Britain ; the 
remainder are very widely distributed, but are chiefly found in tropical 
countries ; they may be known by having the rostrum furnished with a 
depressed triangular dilatation at apex; the antennz are inserted in 
front of the middle of the rostrum in both sexes and the serobes com- 
mence considerably in front; the club of the antenne is large ; the 
eyes are subrotundate ; the anterior coxe are plainly distant, and the 
mesosternum is placed on the same level with the prosternum ; the 
species are found in decaying wood. 
C. ferrugineus, Clairv. (parallelopipedus, Herbst.; linearis, F. 
nec Boh. et Gyll.). Pitchy black or ferruginous, with the head and 
thorax often darker than the elytra, which are depressed on disc; 
* Mr. Moncreaff has sent me the following note on this species : “ This rare species 
I have found in numbers in a piece of spruce fir that at one time formed a portion of 
a wine bin in a grocer’s cellar at Southsea and which I had purchased for firewood ; 
the larvee make oval burrows in the soft portions of the wood, and with them I have 
found several specimens of a parasite (Cerocephala formiciformis DP? 
