674 REVISION OF THE GENUS HETERONYX, 



H. juhatus, being indeed as fine and close as it well could be, — 

 almost more so than in H. j^'^^stulosus, the elytra have scarcely a 

 trace of striae, the hind coxse are distinctly longer than the meta- 

 sternum, the hind femora are wider with their inner apical angle 

 less marked, the longitudinal impressions on the ventral segments 

 are wanting, and the undersurface is more shining. 



A single example was taken near Port Lincoln by Mr J. 

 Anderson. 



H. VACUUS, sp.nov. 



Minus elongatus ; postice leviter dilatatus ; subnitidus ; ferru- 

 gineus ; pilis aureis adpressis minus crebre vestitus ; clypeo crebre 

 fortiter rugulose, capite postice paullo sparsius crassius (huic et 

 illo pube densiori suberecta), prothorace subtiliter minus crebre, 

 elytris subtiliter squamose, pygidio obscure (nonnullis exemplis 

 fortius) punctulatis ; labro clypeum late minus fortiter superanti; 

 antennis 9-articulatis ; unguiculis appendiculatis, unguiculorum 

 posticorum parte basali apicali sat longiori ; coxis posticis meta- 

 sterno sat brevioribus. [Long. 3§, lat. 1^ lines (vix). 



The " trilobed " appearance of the head is not from any point of 

 view very well defined owing to the slight convexity of the upper 

 outline of the labrum, and the feeble emargination of the clypeus 

 (which, however, is margined all across) ; hence the middle lobe 

 appears much more than half as wide as the lateral ones, and all 

 appear but little prominent. The clypeus is fairly distinct from 

 the rest of the head, with a feebly arched suture and puncturation 

 evidently closer and less coarse. The prothorax is slightly more 

 than half again as wide as long, the base slightly more than half 

 again as wide as the front which is only moderately concave, with 

 angles sharp Vjut not very prominent ; the sides are strongly 

 rounded, the hind angles quite rounded off, the base only feebly 

 bisinuate but rather strongly lobed hind ward. The elytra are 

 punctured somewhat as in H. 2^uncti2)ennis and MulwaleiiRis, but 

 decidedly less closely than in either ; their puncturation is very 

 much closer, finer, and more squamose than in H. aphodioides ; 

 their lateral fringe is normal, their apical membrane distinct. 



