692 REVISION OF THE GENUS HETERONYX, 



scarcely angulated in the middle. The prothorax is all but twice 

 as wide as long, the Avidest part (the base is quite undefined, owing 

 to the hind angles being completely rounded off) is not quite half 

 again as wide as the front which is feebly concave with angles 

 neither much produced nor particularly acute; the sides are 

 strongly rounded, widest immediately behind the middle ; the base 

 is feebly trisinuate, the middle hardly perceptibly lobed hindward. 

 The elytra bear some faint suggestions of striae ; their transverse 

 wrinkling is not noticeable, their lateral fringe is normal, their 

 apical membrane obscure. The whole upper surface appears to 

 be of a velvety texture which with the pubescence entirely conceals 

 the sculpture, — but in an abraded example it is seen that the 

 puncturation of the prothorax, elytra and pygidium is faint, fine 

 and close, and that of the head stronger but scarcely closer (the 

 clypeus, however, being closely, but by no means coarsely, rugu- 

 lose). The underside is very like that of H. ^nistulosus, but the 

 following differences should be noted: the entire surface has a 

 slight silky lustre (most conspicuous on the hind coxag), — the 

 metasternum is not granulated, — the puncturation of all parts is 

 a little finer and less close, — the ventral series consist of long, 

 stout, yellow hairs, and seem more conspicuous in an example of 

 equal freshness. The hind femora are not so much wider than the 

 intermediate as in H. pustulosus, the apical piece of the hind 

 claws is shorter in proportion to the basal, and the uppermost 

 tooth of the front tibiae is considerably smaller in proportion to 

 the lower teeth. The tarsi also are longer and more slender, the 

 2nd joint of the hind tarsi scarcely as long as the basal joint. 

 The antennae are 9-jointed. [Long. 3|-5, lat. lf-2f lines. 



W. Australia. 



H. DOCTUS, sp.nov. 



Sat elongatus ; postice leviter dilatatus ; minus nitidus ; rufo 

 ferrugineus fere aurantiacus ; pilis minus brevibus adpressis albidis 

 subtilius vestitus ; corpore vix perspicue (nisi sub lente forti) 

 punctulato; labro clypeum sat fortiter sat late superanti; antennis 

 9-articulatis ; unguiculis appendiculatis; unguiculorum posticorum 



