700 REVISION OF THE GENUS HETERONYX, 



what paler colour, and that the middle of the base of the pro- 

 thorax is quite evenly convex hind ward. The difference in the form 

 of the suture of the elytra near, and at, the apex renders the two 

 quite easy to distinguish. The ventral series of hairs seem a little 

 more conspicuous than in H. longulus. Compared with H. flavus 

 the size is very evidently greater and the elytra are evidently 

 longer and less dilated hind ward, with puncturation less close and 

 fine ; their colour also has a ferruginous reddish tone that is 

 entirely wanting in those of H. flavus of which I have seen many 

 examples but no varieties in this respect. 



S. Australia ; Victor Harbour and Kangaroo Island. 



H. POSTiCALis, sp.nov. 



Sat elongatus, postice vix dilatatus ; subnitidus ; ferrugineus, 

 antennis palpisque testaceis ; pilis brevibus adpressis minus spar- 

 sim vestitus ; clypeo crasse rugulose, capite prothorace pygidioque 

 crebrius minus foi'titer, elytris crebrius squamose minus fortiter, 

 punctulatis ; labro clypeum minus late minus fortiter superanti ; 

 antennis 9-articulatis ; unguiculis appendiculatis : unguiculorum 

 posticorum parte basali apioali pauUo longiori ; coxis posticis 

 metasterno vix brevioribus ; elytrorum membrana apicali valde 

 producta. [Long. 3f, lat. It lines. 



The "trilobed" appearance of the head is feeble, all the lobes 

 being little developed, the middle lobe as long and little more than 

 half as wide, as the lateral lobes. The clypeus is rather strongly 

 concave in front, and is margined all across ; it almost forms an 

 evenly continuous surface with the rest of the head, from which 

 it is separated by a feeble suture. The prothorax is half again as 

 wide as long, its base not quite half again as wide as its front 

 which is rather strongly emarginate, with sharp well -produced 

 angles ; its sides are gently arched, and have their greatest 

 divergence a little behind the middle ; the hind angles viewed 

 from above do not appear so entirely rounded off as they are seen 



