568 Mr. T. Yernon Wollaston on the 



The first and second segments, also, of their 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 glabricollis, Bohm., from southern Africa, 

 will enter into this genus. 



84. COSSONUS (Clairville, Ent. Helv. 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, parallel, depressed, deeply- 

 sculptured, dark, and shining bodies of the insects of which 

 it is composed, in conjunction with the form of their ros- 

 trum (which is always contracted behind, though often 

 very shortly 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 coxse, 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. HYPONOTUS (nov. gen.}. I am indebted to Mr. 

 Pascoe for the loan of the curious insect for which the 

 present 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 Malay peninsula. 

 Its elongated, parallel outline, and dark, opake, closely 

 sculptured surface, give it somewhat the appearance at 



