492 NOTES ON AUSTRALIAN COLEOPTERA, 



Heteronyx pygidialis, Blackb. 



Among the specimens of Heteronyx mentioned above is a much 

 damaged specimen which belongs, I think, to this species. 



Heteronyx proditor, sp.nov. 



Sat elongatus ; postice leviter dilatatus ; sat nitidus; obscure 



ferrugineus, antennis dilutioribus ; pilis f ulvis minus brevibus 



suberectis sat dense vestitus ; capite elytris pygidioque sat 



sparsim, prothorace paullo magis sparsim, sat for titer punc- 



tulatis ; labro antice emarginato clypei supernciem vix 



attingenti nihilominus superne conspicuo ; antennis 9-articu- 



latis; coxis posticis metasterno multo brevioribus ; unguiculis 



prope apicem obscure appendiculatis. [Long. 3^, lat \\ lines. 



This is one of the difficult species that seem to hover between 



the 2nd and 3rd sections of the genus, the labrum being prominent 



and turned upward just about to the level of the clypeus, but so 



shaped (emarginate in front) that from no point of view does the 



outline of the head present a trilobed appearance. It is not very 



close to any species known to me, but I think should be placed in 



the 2nd section in the neighbourhood of H. diversicej)s, Blackb. 



In the tabulation of this section (P.L.S.N.S.W., 1889, pp. 1230, 



&c, and there called " Group III.") it would fall under " F " (on 



page 1231) in company with H. granum, Burm., from which it 



differs inter alia by the very sparse puncturation of its prothorax. 



The prothorax is moderately transverse, about half again as wide 



as long, and is nearly twice as wide across the base as across the 



front margin ; the sides are rather strongly rounded, being at 



their widest a little behind the middle ; the base is strongly lobed, 



and the hind angles viewed from above appear as nearly right 



angles. 



W. Australia ; Yilgarn ; sent to me by Mr. French. 



Heteronyx brevicornis, Blackb. 



This species is also represented among the Yilgarn specimens 

 mentioned above. 



