Genera of the Cossonidce. 581 
and appear to be extensively spread over the Malayan 
archipelago — whence two species of each, now before 
me (which have been communicated by JSIr. Pascoe), 
were obtained by Mr. Wallace in the islands of Ceram, 
Morty, Batchian, and Ternate. They belong to a type 
quite distinct from any of the preceding ones, — their very 
lightly sculptured, shining, deep-back, cylindi-ical bodies, 
in conjunction with their short, broad, and thick rostra 
(which are but very little narrower than the head), their 
excurved scape, their abrupt, compressed club, and the 
fact of their first and second abdominal segments being 
divided by a very conspicuous line, giving them a cha- 
racter Avhich it is impossible to mistake. In Xestoderma 
the rostrum is free from an anterior channel, the capitulum 
is but moderately developed, the intermediate coxjb are 
very remotely separated, and the third tarsal joint is quite 
simple. The scutellum is either small and somewhat 
rounded, or else smaller still, short and transverse. 
105. Xestosoma {nov. gen.). — As already implied, the 
members of this genus have much the appearance of those 
of the preceding one ; nevertheless the body is relatively 
a little broader and thicker ; and moreover, Avhilst one of 
the species is highly polished, the other is almost opake. 
The antennjB too have their scape longer and somewhat 
more robust, and their club dark and sericeous, and con- 
siderably more developed, — it being very large and rounded 
in the X. grandicollis, but oval in the subopacus. The 
scutellum is very minute, short, and transverse (rather 
more so perhaps than in even the Xestoderma atra) ; the 
intermediate cox re are rather less widely separated ; and 
the third tarsal joint is not quite simjDle, — it being appre- 
ciably (at any rate in the anterior pair), though very mi- 
nutely, sub-bilobed, or cordate. 
106. LiSSOPSiS {nov. gen.). — Unfortunately the only 
example which is accessible to me in drawing out the 
characters of the present genus has lost its antenna ; yet 
its other details are so well defined, and I am so convinced 
that the insect cannot be referred to any other group enun- 
ciated in this paper, that I have no hesitation in treating 
it as a distinct type of the sub-Hylastideous Cossonids with 
exceedingly abbreviated rostra. It is at once remarkable 
for its rather wide, short, and parallel-oblong outline (which 
is somewhat obtuse both before and behind) ; for its ros- 
