676 REVISION OF THE GENUS HETERONYX, 



SO feebly reflexed that the distmction of one lobe from another is 

 almost lost. In most other respects very like H. vacuus, but with 

 the following distinctions ; — the front angles of the pro thorax are 

 less advanced, and the hind angles are from some points of view 

 sharply rectangular or subacute (in vacuus they appear quite 

 rounded off from all points of view), the base is strongly bisinuate, 

 the surface is a little more closely punctulate, and the puncturation 

 of the elytra is deeper and more conspicuous. 



N. S. Wales ; in the collection of Sir William Macleay. 



H. RusTicus, sp.nov. 



Minus elongatus ; postice leviter dilatatus ; subnitidus ; ferru- 

 gineo-piceus, antennis palpisque testaceis ; pilis aureis vestitus 

 (his exemplo typico plerisque evulsis) ; capite crasse rugulose, 

 prothorace elytrisque subsequa liter fortius nee crebre, pygidio 

 insequaliter, punctulatis ; clypeo labrum late leviter superanti ; 

 antennis 9-articulatis ; unguiculis appendiculatis, unguiculorum 

 posticorum parte basali apicali parum longiori, apice subfortiter 

 producta ; coxis posticis metasterno paullo brevioribus. 



[Long. 3 J, lat. 2 lines (vix). 



The description of the head in the detailed description of H. 

 vacuus may be taken as applying to this insect also. The pro- 

 thorax is nearly twice as wide as long, its base not quite half 

 again as wide as its front which is only very feebly concave, with 

 very small angles ; the sides are gently arched, the hind angles 

 scarcely distinct from any point of view, the base rather distinctly 

 bilobed. The puncturation of the elytra scarcely differs from that 

 of the prothorax except in being a little closer; there is scarcely a 

 trace even of a sutural stria or of any transverse wrinkling ; the 

 lateral fringe is normal, the apical membrane distinct. The 

 description of the underside in //. vacuus may be applied to this 

 species except that the metasternum is exceptionally short, (being 

 not much longer than the hind coxae, and suggesting a doubt 

 whether this species might not find its place better among 

 species having the hind coxse elongated), and that the ventral 



