BY THOMAS G. SLOAN K. 119 



smaller size; imrrower form; elytra more convex, proportionately 

 more elongate, less strongly rounded on sides; margins of pro- 

 thorax and elytra and intlexed margins of elytra viridescent. 



In C. distinctiim and G. concinnum the supraorbital sulcus 

 extends backwards and downwards in a wide shallow course till 

 it meets the suborbital channel, so that the orbits are thus defined 

 from the adjacent parts of the head; this feature is more de- 

 veloped in 0. distinctum. 



Carenum subcyaneum, Macleay. 



Trans. Ent. Soc. N. S. Wales, 1869, ii. p.66; (?) C. rugatum, 

 Blkb., Trans. Roy. Soc. S. Aust. 1887, x. p. 62; (?) C. sulcaticejys, 

 SI., Proc. Linn. Soc. N. S. Wales, 1897, xxii. p.l99. 



The form which I formerly recorded as "C. sidcfticeps, var. 0." 

 (these Proceedings, xxii. 1897, p. 201), proves, after comparison 

 with the type of C. stibc/jcmeum, Macl., to be identical with that 

 species. I now think C. subcyaneum will prove to be a variable 

 species ranging over a wide area of Australia to the north, east 

 and west of the Great Australian Bight, and in that belief 

 suggest that G. ru^gatum, Blkb., and G. sidcaticeps, SI., should be 

 placed under C. subcyaneum, possibly as varieties. 



Carenum carbonarium, Castelnau. 



Trans. Roy. Soc. Vict. 1868, viii. p. 134; G. vicinum, SI , Proc. 

 Linn. Soc. N. S. Wales (2), iv. 1889, p.l293. 



In these Proceedings (xxii., 1897, p.206) I suggested that C. 

 vicinum, SI., might prove to be conspecific with G. carbonarium, 

 Casteln. I have now seen a specimen from Esperance, W.A. 

 (sent to me by Rev. Thos. Blackburn) which is identical in 

 colour, etc., with my type of C. vicinum,. The range of G. vicinum 

 being thus extended to Esperance (Castelnau's locality for G. 

 carbonarium), I think it must be considered as synonymous with 

 G. cai'bonarium, for the mere fact of a Garenum being flushed 

 with purple towards the sides of the prothorax and elytra is quite 

 insufficient to differentiate it from an allied but wholly black 



