428 REVISION OF THE AMYCTERIDES, V., 



thorax rounded or dentate at sides; subapical and basal trans- 

 verse impressions well marked, the latter often hidden from 

 above; disc granulate. Elytra suboval, basal angles generally 

 strongly rounded; disc regularly striate-punctate ; interstices 

 granulate, occasionally showing extraordinary sexual characters. 

 Undersurface generally depressed at base of abdomen in the 

 male, convex in the female. Femora and tibia? showing, in 

 many species, marked sexual characters; tarsi with clawjoint not 

 flattened as in Molochtus. 



The genus Cubicorrhy nclbus was described by Lacordaire for a 

 group of species of which he knew of no described example, 

 although he alluded to several known under MS. -names, as pro- 

 bably belonging to the genus. His generic diagnosis leaves it 

 quite clear, however, to what group of species he intended the 

 name to belong; and Macleay has rightly claimed the name for 

 those species which now bear it. 



This genus, and Molochtus, are the first of a section of the 

 Amycterides which seems, to me, distinct from the Psalidura- 

 Talaurinus-Sclerorinus complex; and which contains two large 

 genera, Cubicoi-rhynrhiis and Acantholophus, as well as a number 

 of smaller ones. I do not propose at present to define the limits 

 and characters of the different sections of the family; as such 

 will require much further study. I merely indicate here the 

 existence of these sections, in passing from one to another. 



The essential characters of Cubicorrhytichiis, as distinguishing 

 it from its immediate allies, lie, to my mind, in the rostral 

 structure. In Cubicorrhyiichus, the rostrum is short and broad, 

 and the upper surface is at most feebly concave, the lateral 

 margins not being raised; although, in profile, they are more or 

 or less convex. The rostrum is separated from the head, above, 

 by a transverse, linear impression; in a few species, this line 

 turns backwards along the inner sides of the crests. The pre- 

 sence of supraorbital crests is constant, although these vary 

 somewhat in direction and development. There are also two 

 small granules present in most species, although in some they 

 aie absent; and they are present in a few species at present re- 

 ferred to Acantholophus. The prothorax varies in different 



