568 Mr. T. Vernon Wollaston on the 
The first and second segments, also, of tlieir abdomen are 
more completely fused into each other than is the case 
■with any of the Cossoni which I have hitherto examined. 
Although rather more parallel in outline, I believe that 
the Cossonus (/labricollis, Bohm., from southern Afiica, 
will enter into this genus. 
84. Cossonus (Clairville, JEnt. Heh. i. 58. 1798).— 
The genus Cossonus, so widely distributed over the world, 
presents a great amount of structural instability as regards 
the degree of rounded-dilatation towards the apex of its 
rostrum and the coarseness of its sculpture ; and I think it 
far from unlikely that a close comparison of its numerous 
representatives (as at present acknowledged) might enable 
us to separate them into two or three tolerably distinct 
groups ; nevertheless as it is not my object in this memoir 
to monograph the closely-allied species of genera which are, 
on the whole, sufficiently well understood, I shall not 
attempt to do more than detach a few forms which are 
readily accessible to me, and concerning the claims of 
which for separation there can, I think, be no reasonable 
doubt. Amongst, however, its multitude of specific modi- 
fications, Cossonus is by no means unsatisfactorily defined, 
— the more or less narrow, jiarallel, depressed, deeply- 
sculptiu'cd, dark, and shining bodies of the insects of which 
it is composed, in conjunction with the form of their ros- 
ti'um (which is always contracted behind, though often 
very shortlij so, and spatulate, or expanded in front, — • 
sometimes to an extraordinary, and at others to merely a 
slight, extent), its more or less longitudinally-impressed 
prothorax, rather widely separated anterior coxa?, and the 
unexpanded third joint of its feet, giving it a character 
which it is impossible to mistake. Its antennas are inserted 
into the roundly-expanded apical portion of its rostrum ; 
its eyes are transverse, oval, and not very widely separated 
across the forehead ; and its surface is nearly always free 
from every trace of pubescence. 
85. HypoxoTUS {nov. gen.). — I am indebted to Mr. 
Pascoe for the loan of the curious insect for which the 
j)resent genus has been erected ; and, judging from a label 
which is appended to it, it appears to have been captured 
by Mr. Wallace at Singapore, in the IVIalay peninsula. 
Its elongated, parallel outline, and dark, opake, closely 
scul])turcd surface, give it somewhat the aj)pearance at 
