644 STUDIES IN AUSTRALIAN ENTOMOLOGY, 



the whole length of the elytra, all crossing the elytral fascia. 

 Undersurface bluish black, excepting the prothorax in front of 

 the coxfe red, and the metasternum piceous. Legs black, the 

 basal part of the femora light yellow ; tarsi hairy above, last joint 

 not bifid. 



Length 7, breadth 2i^ mm. 



iTaS.— Mulwala, Murray River, N.S.W. 



This species is closely related to C. glohidicollis, Macl., though 

 very distinct by the markings of the elytra. As pointed out by 

 Sir William Macleay, these species evidently cannot remain in 

 the same genus as C. aliena* Pasc. ; they differ from' it in tlieir 

 short globular prothorax, broader elytra, hairy tarsi, and the form 

 of the antennae. In C. aliena the antennte are very slender and 

 have the 3rd joint about equal in length to the 3 succeeding ones, 

 while C. riverince and C. glohidicollis have the 3rd joint much 

 shorter and about as long as the 4th. De Chaudoir has expressed 

 the opinion (Bull. Mosc. LII, 1877, p. 265) that C. obscura would 

 be better placed in Odacantha, a genus unknown to me except 

 from description. 



Laccocenus, n.gen. 



Head not large, with a longitudinal ridge on each side extend- 

 ing backwards as far as the base of the eyes, forehead smooth, two 

 supra-orbital punctures on each side. 



Mandibles, short, strong, scrobe with a setigerous puncture in 

 front. 



Maxillce roundly curved in front, apex elongate, not acute, inner 

 side clothed with a single row of hairs. 



Labrum sexsetose and lightly emarginate in front. 



Clypeus emarginate, a strong setigerous puncture on each side. 



* De Chaudoir has published the identity of C. australis, Chaud., and C 

 clarensii, Cast., with C. aliena, Pasc. (Bull. Mosc. XLV, Part i, 1872, p. 405); 

 to these must be added C. angusticoUis, Macl., that species being (as sus- 

 pected by its author) not separable from G. aliena ; this I have ascertained 

 by comparison of a specimen of C. aliena from the Richmond River, N.S.W., 

 in my collection with Sir William Macleay's type of C. angusticoUis. 



