Genera of the Cossonidce. 561 
allied forms) armed Avitli a powerfld and compressed spine 
at their inner angle, and the feet short and thick, with 
their third articulation expanded and deeply bilobed. 
Their pro thorax, too, (as in the Madeiran Stenotis) ap- 
pears to be more or less concave beneath ; and their 
antennge are implanted either about or a trifle before the 
middle of the rostrum. 
73. Glceoxenus (iiov. gen.). — It is for an insect from 
Madagascar (which has been communicated by John 
Gray, Esq.) that I have proposed the present genus; and 
its prima facie aspect and fusiform outline are somewhat 
those of a gigantic, deep-black, highly-polished, and lightly- 
sculptured Rhyncoliis. When more closely examined how- 
ever it will be seen to belong, in reality, to a totally dif- 
ferent group, — the robust and peculiarly-shaped spine at 
the inner angle of its four posterior tibite, in conjunction 
with its much abbreviated and thickened feet (the terminal 
joint of which is extremely short and conical) affiliating it, 
most unmistakeably, with the types around Gloeodema, 
Phacegaster, Exonotus, and Pseudocossonus. Its rostrum 
is rather broad, depressed, and nearly parallel (though 
whether this is equally the case in both sexes I have no 
means of judging) ; its limbs are incrassated and exceed- 
ingly robust ; the third articulation of its feet, although 
greatly thickened, is simple ; and the spine at the inner 
apex of its front tibiae is marvellously lengthened and de- 
veloped, — in which latter respect it differs from every other 
Cossonideous form with which I am acquainted. As in 
most of these immediate genera, its club is narrow and 
somewhat acuminated ; but its antennas are inserted a 
little more evidently before the middle than is usual in the 
majority of its allies. 
74. ExoNOTUS {nov.gen.). — A genus the type of which 
(captured by Mr. Wallace in the islands of the Malayan 
archipelago) is well distinguished by its elongate, narrow, 
and parallel outline, rather large size, and convex, shining 
surface, — which is of a deep black, with the anterior por- 
tion of the elytra red. Its head and rostrum are broad, 
and of nearly equal width, — the latter (which seems to be 
linear in the females, but rather expanded anteriorly in 
the males) being somewhat short ; its coxse are all of 
them about equally separated ; its legs are exceedingly 
thick and robust ; its tibite (the front pair of which are 
