BY WILLIAM MACLEAY, JUN., ESQ. 145 



This fine species is also in the AustraHan Museum, and is 

 marked "Mitchell's Exp., V.R.," that is, "to the Victoria River." 



19. — CaEKNUM DISTINCTUM. 



Nigro-violaceum nitidissimum, thorace subquadrato angulis 

 posticis rotundatis, abdomine ovato, elytris puncto versus 

 apicem impressis, tibiis anticis extus ti'identatis. 

 Long. 8 lin., lat. 2| lin. 



The facial grooves in this species converge much in front, and 

 are united behind by a straight transverse depression, there is. 

 also a shallow round depression in the centre of the head between 

 the eyes. The thorax is rather broader than long, with the 

 posterior angles rounded, while towards the base the violet 

 colour, which is most conspicuous on the elytra, begins to appear. 

 The elytra are convex, and of an elongated shape, with a 

 puncture on each near the apex, a row of punctures along the 

 lateral margin, and two or three irregular ones on the basal 

 margin. The fore tibiee are tridentate externally, the upper 

 tooth being smaller than the others. 



This insect is also in the Australian Museum, and is labelled 

 in the same manner as the last, although it by no means follows 

 that, because these two species might have been taken during 

 Sir T. L. Mitchell's last expedition, they were found at the 

 Victoria River. 



The large number of species added to the genus Garenuni in 

 the foregoing Paper, bi'inging the number up in all to forty, 

 renders a tabular view of the genus almost necessary, in order to 

 save the tim6 and trouble which would be necessaiy to read 

 over the detailed descriptions. I give accordingly on the next 

 page a synopsis of all the species ai-ranged in a manner extremely 

 simple and at the same time not unnatural. It is utterly impossi- 

 ble in a good genus to lay down absolute rules for its subdivision ; 

 thus for instance, in the present case some of the species of the 

 elongate subdivision of the bidentate group run into the section 

 of which G. Bonellii is the type ; again, the section of which 

 C. marginatum is the type, though placed among those which 

 have the fore tibias bidentate have really all, excepting G. scitidum, 

 two very small teeth above the others. C. inegacephalumWestw., 

 on the other hand, though clearly belonging to the section in 

 which T place it, is described as having the fore tibice unidcntatc. 



