688 REVISION OF THE AMYCTERIDES, iv., 



notched in the sub costatics-gr ou-p. The anterior tarsi are com- 

 paratively short, and the posterior elongate. In some species, the 

 undersurface^ on each side of the median channel, is spongiose; 

 this is most marked in -6'. tristis and its allies. The posterior 

 tarsi generally bear long, setose bristles. 



The male genitalia vary a good deal in different species; more 

 dissections are required, however, before it will be possible to 

 assess the value of the differences in grouping the species. In 

 all, the forceps are short, bluntly acuminate, with the apex set 

 with stout bristles, and chitinous. In some species, the two 

 parts of the forceps are separate, or only united at the base by 

 membrane; in others, there is a thin, chitinous septum uniting 

 the two halves. In some species, there is a median vertical 

 plate present, as in Psalidura, the lower border of which divides 

 behind into two rami, attached to the ends of the forceps; in 

 other species, there is no such plate. The penis varies in different 

 species, but is of the same general type as in other Amycterides. 

 Pending further dissections, I have not described these structures 

 in detail, as they appear in the few specimens so far dissected. 

 I believe, however, that they will prove of taxonomic importance, 

 though, unless differences in the genitalia are correlated with 

 differences in elytral or other external structure, they will not 

 be of much service in identifying species. 



Among the Amycterides described previous to the institution 

 of the genus, only eleven can be referred to Sclerorinus; and, of 

 these, the names of three must be regarded as synonyms. 



CurcnUo bubalns Olivier (Ent. v. 83, p.39y, t.25, f.354) is 

 certainly a Sclerorinus, and a common Tasmanian species. 



IIippo7'hiuus nigrospinosus Don., (Epitom. Ins. N. Holl., 1805) 

 is, from the figure, clearly a Scleroritius. 



Boisduval (Voy. Astrolabe, ii., 1835) described four species 

 which appear to belong to the present genus. Amycterus morosus 

 (loc. cit., p. 386), though long regarded as a Cubicorrhynchus, is a 

 Sclerorinus, and synonymous with S. bubalus Oliv. S. carinatus 

 {loc. cit , p. 385) is probably synonymous with S. uigrospiuosus 

 Don. is. tristis (loc. cit., p. 388) is a well known Tasmanian and 

 Victorian species. S. doleiis {loc. cii., p. 376; is unknown to me. 



