390 RHYNCHOPHORA. [ Cossonina. 
the eyes ; the posterior coxe are transverse and ovate; the femora are 
unarmed, as is also the case with Calandra, and the tibix are usually 
armed with a strong curved spine at their apical angle. 
The tribe contains a considerable number of genera and species ; 
these are all, or almost all, wood feeders, and, as observed by M. Bedel, 
the greater part are found not far from the sea, and two-thirds of the 
species that have been described belong to insular faunas; this point 
has received great attention from Mr. Wollaston, who has described one 
genus, Microaylobius, containing thirteen species, all of which are 
peculiar to St. Helena ; in fact the Cossonide are most interesting as 
being the archaic remnants of ancient fauna in these detached islands. 
About sixty species are found in Europe, of which nine occur in 
Britain ; the number of genera assigned to the tribe in the catalogue of 
Heyden, Reitter and Weise is seventeen, of which six are found in our 
country ; different authors have, however, arranged the genera in different 
fashions ; Wollaston, for instance, divided off the genera Brachytemnus 
and Stereocorynes from Rhyncolus, but they are now again included under 
it by M. Bedel, who, on the other hand, places our two species Phlao- 
phagus ceneopiceus and P. spadix under two distinct genera, Caulotrypis, 
Woll., and Codiosoma, Bedel, and regards Phleophagus as including 
part of the species which are now placed under Lhyncolus. 
I. Scutellum distinct ; metathoracic episterna well 
marked. 
i. Funiculus of antenne 5-jointed. . . . . PENTARTHRUM, Woll. 
ii, Funiculus of antenne 7-jointed (rarely with 
6 joints).* 
1. Rostrum terminated by an abrupt trian- 
gular flat dilatation ; anal segment with 
two small silky hairs on its posterior 
margin . «+ «© + « © + « « « Cossonus, Claire. 
2. Rostrum without an abrupt quadrangular 
dilatation at apex ; analsegment without 
hairs. 
A. Metathoracic episterna rather broad ; 
rostrum very different in the sexes; an- 
tenn inserted at the base of the rostrum 
in the male and in front of middle in 
female. cays Wiles: won Molbse acta ae Wee ce 
B. Metathoracie episterna linear ; rostrum 
similar in the sexes. .« « » « « « « RHYNCOLUS, Steph. 
II. Scutellum not visible. 
j. Episterna well marked along the whole length 
of the metasternum ; upper surface glabrous . CAULOTRYPIS, Woll. 
ii. Episterna indistinct ; upper surface with dis- 
tinct pale hairs. . . . . + « + + + + Copiosoma, Bedel. 
RHOPALOMESITES, Woll. 
(i oa 
* Two European species of Ahyncolus, R. culinaris and R. submuricatus have the 
funiculus 6-jointed ; these form the genus Hewarthrum, Wollaston, which ought 
apparently to be retained. 
