678 REVISION OF THE GENUS HETERONYX, 



do not differ perceptibly from those of H. vacuus^ except in the 

 former (together with the ventral segments) being very finely 

 coriaceous and therefore less nitid. The ventral segments bear at 

 the sides well defined but not close punctu ration, their middle 

 part being almost without defined punctures but more strongly 

 coriaceous. The description of the legs of H. vacuus may be 

 applied to this insect. 



Apart from colour differences H. nigrinus resembles H. vacuus, 

 but is on the upper surface very much more coarsely punctulate, 

 and on the underside coriaceous and much less nitid. 



A larger specimen (long. 3| lines) does not seem to differ except 

 in respect of size. 



Neighbourhood of Adelaide. 



H. OSCILLATOR, sp.nov. 



Minus elongatus; postice vix dilatatus; minus nitidus; obscure 

 ferrugineus, antennis palpisque testaceis ; pilis fulvis elongatis 

 adpressis (hie illic in capite nounullis erectis) vestitus ; capite 

 crasse rugulose nee crebre, prothorace fortiter sat crebre, elytris 

 subtilius squamose crebre, pygidio (hoc subtiliter coriaceo) sparsim 

 obsolete, punctulatis; labro clypeum late minus fortiter superanti; 

 antennis 9-articulatis ; unguiculis appendiculatis ; unguiculorum 

 posticorum parte basali apicali multo longiori ; coxis posticis 

 metasterno sat brevioribus. [Long. 3, lat. IJ lines. 



This species is extremely close to H. nigrinus and the whole of 

 the detailed description (above) of that species may be applied to 

 it, so far as is consistent with the Latin diagnosis. The following 

 are the principal differences between the two : in oscillator the 

 clypeal suture is less distinct, the prothorax is more strongly and 

 closely punctured, the elytra are very much more closely, finely, 

 and squamosely punctured (their puncturation resembling that in 

 H. jjunctipennis and Mulwalensis, without being quite so fine and 

 close as in those species) and the basal piece of the hind claws is 

 larger in proportion to the apical piece with its apex less decidedly 



