270 THE GENERA. AND SPECIES OF AMYCTERID^, 



Genus ACANTHOLOPHUS. MacLeay. 



Ante7ince graciles funiculi arfciculo secundo longiore. 



OcuU ovati infra subacuminati. 



Rostrum latissimum capite longius supra subplanum subtus gula 



vix crassatum basi utrinque tuberculatum. 

 Caput fronte excavatum vel retusura. 

 Thorax subplanus antice lobatus postice truncatus ad latera 



spinosus. 

 Elytra rigida ecliinata vel tuberculata. 

 Pedes longi graciles. 

 Mandibulce, &c., ut in Psalidura. 



The tubercles or spines on the lateral borders of the rostrum 

 form the chief character of this genus. The front part of the 

 head is always more or less retuse, and sometimes excavated. 

 The throat or under part of the rostrum is not thickened and has 

 for the most part a rectangular emargination. The thorax has 

 the sides toothed, tuberculated, or spined, and in the greater 

 number of species the disc also is armed with tubercles or spines. 

 The elytra, also, are always more or less spinose. The difference 

 between the male and female is considerable, the latter being lar- 

 ger, broader, and less strongly tuberculate, but I cannot find that 

 the differences in the anal segment of the abdomen, exhibited to 

 a greater or less degree in all the other genera of the subfamily, 

 extend at all to this genus. 



I propose to adopt the plan suggested by Mr. Waterhouse 

 (Trans. Ent. Soc. Lond., vol III., 2nd series, p. 76) for the sub- 

 division of this genus, merely reversing the order, so as to bring 

 those species which most closely resemble the genus Amycterus, 

 into the closest pi'oximity to it. 



I also propose to place in another genus that section of Mr. 

 Waterhouse's in which he places Acantholophus coevosus, the 

 shape of the head and rostrum being quite distinct from that of 

 Acantliolophus. 



