400 STUDIES IN AUSTRALIAN ENTOMOLOGY, 



base ; sides lightly rounded, the curvcature to anterior and poste- 

 rior angles equal ; anterior angles obtuse, lightly advanced ; pos- 

 terior angles rounded, not marked ; base short, lobate, lobe short, 

 rounded, a strong sinuosity on each side of the basal lobe ; border 

 widely reflexed, hardly more prominent at basal angles ; . marginal 

 channel wide, narrower along base ; median line strongly impressed ; 

 three marginal punctures on each side as in C. oJeivahnii. Elytra 

 cordate-oval, hardly wider than prothorax (11 x 8-2 mm.), widest 

 at about half the length, convex, abruptly declivous to peduncle ; 

 sides lightly rounded ; base truncate ; shoulders rounded ; border 

 reflexed, lightly folded back (not prominently upturned) at hume- 

 ral angles ; margin widely explanate on apical curve ; a strong 

 discoidal puncture on apical third of each elytron, placed about 

 midway between suture and margin just behind beginning of 

 apical declivity ; a few irregularly placed punctures on base of 

 each elytron ; a row of umbilicate punctures along margin. Pro- 

 sternum widely impressed between coxse, truncate at base ; two 

 setigerous punctures on each side before the base. Legs light ; 

 anterior tibise tridentate ; inferior ridge not strong, not extending 

 forward beyond second external tooth ; apical plate wide, projec- 

 ting lightly and obtusely at apex below tarsus. 



Length 22-5, breadth 8-2 mm. 



Hab. — Queensland. (Brought from Queensland by Mr. Lau, 

 probably from the Darling Downs District). 



This species resembles G. splendens, Casteln., so closely that it 

 requires a careful examination to distinguish it. The head is 

 similar ; the prothorax is differently shaped, being wider in front ; 

 this is caused by the sides being more parallel, the widest part 

 being about midway between the anterior and posterior angles, 

 and the curvature to the anterior angles almost equal to that of 

 the posterior ; in C. splendens the widest part of the prothorax is 

 towards the posterior angles, the sides narrowing roundly to the 

 anterior angles ; the curvature of the sides from the posterior 

 angles to the short l^asal lobe is shorter and more decided in C. 

 cognatum than in C. splendens. G. interioris, SI., is another 



