BY W. MACLEAY, JUN., ESQ. 179 



and more convex tlian C. Scaritioides wliicli we may take as the 

 type of the group, besides which, it is of a beautiful violet-blue 

 colour, while the facial grooves take their rise almost behind the 

 eyes and converge towards the clypeus. In G. Scaritioides the 

 facial grooves are almost parallel 



C. atronitens which is found near Gawler Town, Sonth 

 Australia, is flatter than either of the preceding, and has the 

 facial grooves widely divergent behind. 



C. oblongum also from the neighbourhood of Adelaide, is 

 smaller, and differs somewhat in form from the typical insects 

 of the group. In appearance, it is much like G. intermedium 

 and G. amhiguum, and it seems to lead off towards the parallel 

 group of which G. Bonellii is the type. 



Of G. intermedvuiu, I have one specimen from Melbourne, it is 

 very like the last named species, and will be best recognised by 

 the almost obliterated middle of the medial line of the thorax. 



G. niijerriynnm is very like G. scaritioides, but can be at once 

 distinguished from it by the posiMon of the two humeral punc- 

 tures, which are very close to the humeral angles. 



G. arubiguuvi may be most readily distinguished from G. 

 oblongum by the round shallow fovea near the posterior angles of 

 the thorax. 



G. subquadratum differs from all the others in its flat surface 

 and nearly square thorax. 



G. striato-puncttdaimn can be identified by the sculpture of 

 the elytra, wliich present a series of rows of punctures, so 

 indistinct, however, as to be scarcely visible to the naked eye. 



G. coracinum may be distinguished from G. scaritioides, the 

 species it most resembles, by the divergence of the facial grooves 

 towards the back of the head. 



I may here mention that I think that I have made a mistake 

 in stating in page 37 of our Transactions, that G. Scaritioides is 

 an inhabitant of South Australia and King George's Sound. I 

 have not seen it from either of these colonies. 



G. — Caeenum substriatulum. 



Nigrum nitidissimum angustum, elytris violaceo-marginatis 

 sub lente striato-punctatis postice bipunctatis, tibiis anticis 

 extus bidentatis. 



