284 



leviter obtusis parum productis posticis rotundato-obtusis, 



basi subtilissime elevato-marginata ; elytris crenulato- 



striatis, crenulis punctiformibus quam stride sat latioribus, 



interstiis fere planis sparsim subtilius (latera versus magis 



fortiter magis crebre) punctulatis ; pygidio sparsim subtilius 



punctulato ; metasterno fere laevi (parte antica lateribusque 



sat grosse punctulatis exceptis) ; tibiis anticis fortiter 



elongatis ; unguiculis sat parvis. -Long., 2 1.; lat., ll- 1. 



Very close to 0. nitidior^ Blackb., but seems to be certainly a 



distinct species. It is without the slight coppery tone of that 



insect. Its pronotum is scarcely margined at the base (in 



nitidior distinctly), the punctiform crenulations of its elytral 



stri« are considerably smaller, its elytral interstices are nearly 



flat and (especially those near the suture) are quite finely (in 



nitidior coarsely) punctulate, and its pygidium is very much more 



tinely punctured. A single example (taken by Mr. Zietz) is in 



the iS. Australian Museum. 



Central Australia (Lake Callabonna). 



0. bicornis, Macl. I have specimens from the JSTorthern 

 Territory evidently appertaining to this species. They are 

 closely allied to those mentioned above as 0. Erichsoni, Hope^ 

 but are much smaller (Long., 3 — 3| 1.). The frontal lamina in 

 the female is straight and entire (without projections at ends 

 or middle), in the male represented by two short isolated horns ; 

 the median projection topping the retuse front of the pronotum 

 in the male is much like that of 0. Erichsoni, and there is a 

 conic tubercle on either side at the external limit of the retuse 

 front (in the female the middle projection becomes a scarcely 

 prominent and scarcely emarginate gibbosity and there is no 

 external tubercle) ; the sides of the prothorax are not sinuate in 

 front of the middle; the front angles of the prothorax are obtuse 

 and the hind angles very well defined (not far from being right 

 angles) ; the eyes are quite distincoly granulate. 



0. glahratus, Hope. There are several Australian OnthopJiagi 

 that the few words in which this species is described would fit 

 very fairly well. One of them is a species that was sent to me 

 by the late Dr. Bovill from the Port Essington neighbourhood, 

 and therefore I have little doubt of its being the true glabratus. 

 The following indication of characters will enable it to be 

 identified: — Long, 4|^ 1. — 5^1.; color uniform, varying from 

 red-brown (o black, tarsi palpi and antennae lighter (especially 

 the antennal club, which is somewhat testaceous) ; upper surface 

 glabrous coriaceous subopaque ; head without any transverse 

 carinas, its surface to about the level of the eyes transversely 

 wrinkled, hinder part scarcely punctulate ; pronotum faintly 

 sparsely and excessively tinely punctulate, without inequalities 



