o8G Mr. T. Vernon Wollaston on the 
Hexartlirum (for the culmaris, Germ., and the suhmuri- 
catus, Bohm.), andBrachi/fenmus (for the porcatus, Miill.), 
there still remains a residuum, even among-st its smaller 
members, which future monographers will in all pro- 
bability further divide ; yet, having reduced its hetero- 
geneous material thus far, and since I am not professedly 
in this paper examining every described species (some of 
which would not be readily accessible), I am content to 
leave the group pai'tially pruned, and to treat it as repre- 
sented by those particular exponents Avhicli I have been 
able to inspect, and a list of which will be found in my 
general summary at the close of the present memoir. As 
thus curtailed, therefore, I believe that Rhyncolus will be 
found to possess by no means so universal a range as the 
different Catalogues would lead us to conclude, — none of 
its members being, apparently, of a large stature. At the 
same time, however, I would not wish to imply that its 
area of distribution is unnecessarily restricted ; but merely 
to call attention to the fact that a vast proportion of the 
species which figure as Rhyncoli in various papers and 
local enumerations have in reality nothing in common 
with the universally-acknowledged genei'ic type. 
For the characters which separate this genus from 
Phheophafius, Avith which it has occasionally been con- 
founded, the observations which I have given under the 
latter will suffice. 
113. CAULoniiLUS (WoUaston, Ins. Mad. 315. 1854). 
— The insect on which this genus was established in 1854, 
and Avhich I captured twenty-six years ago in the island 
of INladeira, is still unique ; and in its general appearance 
it somewhat resembles at fii'st sight a small state of the 
European Rlujncohis cylindrirostris, Oliv. (== lif/nariua, 
Mshm.). Nevertheless when closely inspected it will be seen 
to be structurally dissimilar in many respects ; and I doubt 
indeed if it can be actually associated with the Rhi/iicoli at 
all. Thus, in addition to its rostrum being obsoletely 
divided from the head by a very obscure frontal line, or 
depression, its antenme are by no means on the true 
RIn/ncolus pattern, — their club being considerably larger 
and thicker, but nevertheless more acute at the apex, 
their funiculus less incrassated (the basal joint being very 
conspicuously smaller, and the terminal ones narrower 
and more transverse), and their scajjc more clavate. Its 
eyes also are very much more developed, as well as 
