Genera of the CossonidoB. 555 
is 7iot lengthened) being especially more incrassate, and 
its club comparatively small and narrow ; in its meta- 
sternum being a trifle more elongate ; and in its cox£e 
being a little less Avidely separated. 
64. Rhopalomesites {nov. gen?).—T\\Q type of this 
genus I regard to be the M. Tardii, of western Europe, 
— an insect which ranges likewise to the Azores; and 
associated with it are several species from the Madeiran 
and Canarian archipelagos, two of which (namely the 
maderensis, and the Teneriffan and Gomeran persimilis), 
although with small distinctive features of their own, may 
possibly prove to be, in reality, but geographical modifi- 
cations of the Tardii. The members of this group difi'er 
from Mesites proper, chiefly, in their male rostrum being 
considerably longer and slenderer, and proportionately a 
little more widened at the point where the antennas are 
inserted ; in the latter (which are implanted either in or 
before the middle, in that particular sex, instead of 
behind it) being very much thinner and more elongate, 
M'ith the scape especially, and second funiculus-joint, more 
lengthened, and with the club very much larger and more 
abrupt; in their head being less incrassated and their 
eyes more approximate ; in their legs being relatively a 
little longer, and rather more widely separated at the base ; 
and in the third articulation of their feet being appreciably, 
though minutely, bilobed. They are also a trifle less 
cylindrical than the true Mesites (having a more evident 
tendency to be subfusiform), as also a little less convex, 
and not quite so shining ; their prothorax is more trian- 
gular (or less oblonff), a,nd is more conspicuously channelled 
behind in the males and carinated in the females ; and 
they are often sparingly clothed with an exceedingly 
delicate sericeous pubescence. 
65. Odontomesites (?iov. f/en.). — Two of the (so-called) 
Mesites from the Canarian archipelago, and one from the 
Cape Verdes, I had long ago detached from the re- 
mainder, — making them to constitute a distinct section of 
the genus, in which the body is more fusiform and de- 
pressed, and the male femora are furnished beneath with 
an obtuse anguliform tooth; and it is quite clear, there- 
fore, that if the Tardii and its immediate associates be 
TRANS. ENT. SOC. 1873. — PART IV. (OCT.) R R 
