160 REVISION OF THE GENUS HETERONYX^ 



Yeiy close to H. auricomus, but differing as follows ; the labrum 

 is more widely and strongly prominent so that the middle lobe of 

 the " trilobed outline " appears longer than and more than half as 

 wide as the lateral lobes ; the clypeus is less distinctly margined 

 in the middle of its front ; the puncturation of the hind part of the 

 head is much less uniform with that of the clypeus; the hind angles 

 of the prothorax are much better defined ; the apical membrane 

 of the elytra is well defined ; the uppermost tooth on the anterior 

 tibiae is much feebler, being much less than half as large as the 

 middle tooth, the external outline of the tibia (from its base to 

 the apex of the uppermost tooth) being straight, whereas in 

 auricomus that outline is more or less concave. The general form, 

 moreover, is a little more elongate and parallel than that of H. 

 auricomus. 



Kangaroo Island ; taken by Mr. J. G. 0. Tepper and others. 



H ELECTUS, sp.nov. 



Sat elongatus ; postice vix dilatatus ; sat convexus ; ferrugineus, 

 antennis pallidioribus ; pilis fulvis vestitus ; capite crasse rugu- 

 lose, prothorace elytrisque sat fortiter sat sparsim, pygidio 

 subtilius nee crebre, punctulatis ; tibiarum anticarum dentibus 

 externis inferioribus 2 validis ; labro clypeum sat late sat fortiter 

 superanti ; antennis 8-articulatis ; unguiculis appendiculatis. 



[Long. 4|, lat. ^ lines. 



Clypeus with reflexed margin obsolete in middle which is widely 

 and gently emarginate ; "trilobed outline" of head moderately 

 defined, the middle lobe appearing more than half as wide and 

 the same length as the lateral ones ; sides of clypeus less arched 

 than in some species of the genus (e.g. H. auricomus and 

 cygneus) ; surface of clypeus nearly uniform with that of rest 

 of head ; clypeal suture feebly impressed and nearly straight. 

 Prothorax not much less than twice as wide as long, the base 

 nearly half again as wide as the front, which is rather strongly 

 emarginate with sharp prominent angles, the sides gently rounded 



