688 REVISION OF THE GENUS HETERONYX, 



clusters of bristles at the apex of the elytra may not be found in 

 the male, — but I think unlikely. There Is no trace of anything 

 of the kind in either sex of the allied species]. 



H. AGRESTis, Burm. 



So excessively close to H. elongatus, Blanch., that I am unable 

 to specify any tangible distinction except the absence in this 

 species of the cluster of bristles at the apex of each elytron ; the 

 relation of the labrum and clypeus, — the portion of the former 

 overtopping the latter being here quite as wide as, and even more 

 prominent than, in H. picshdosios ; and the general form, — R. 

 agrestis being (not less elongate but) more dilated behind the 

 middle of the elytra. 



W. Australia. I possess an example from Port Darwin which 

 I hesitate to distinguish from H. agrestis, though it is decidedly 

 less dilated behind than any Western Australian specimen that I 

 have seen. It differs from H. SGalj)tus in the much wider middle 

 lobe of the " trilobed outline " of the head. 



H. RHINASTUS, sp.nOV. 



Sat elongatus ; postice vix dilatatus ; minus nitidus ; piceo- 

 niger, antennis palpisque testaceis, pedibus obscure rufo-piceis ; 

 pilis brevibus adpressis albidis minus crebre vestitus ', pilis longis 

 erectis (praeter series marginales) trans prothoracis elytrorumque 

 marginem anticam instructus ; confertim sat subtiliter (clypeo 

 subrugulose) punctulatus ; labro clypeum anguste fortiter super- 

 anti ; antennis 9-articulatis ; unguiculis appendiculatis, unguicu- 

 lorum posticorum parte basali apicali haud longiori ; coxis 

 posticis metasterno vix brevioribus. [Long. Sg, lat. 2g lines. 



Extremely like the darkly coloured examples of H. j^ustulosus 

 in general appearance, but seems to be invariably smaller. From 

 that species and all the preceding species that follow it, ff. rhin- 

 astus differs in the relation and structure of the labrum and 

 clypeus, owing to which the " trilobed outline " of the head is 

 exceptionally well defined, — the middle lobe appearing very 



