438 STUDIES IN AUSTRALIAN ENTOMOLOGY, 



gg. Four rather convex interstices on each elytron 



R. liopleurus, Chaud. 



A A. Elytra smooth with faint linear strife 



R. ( Pcecilus) Icevis, Macl. 



II. Upper surface black, elytra widely margined with yellowish 

 red R. limhatus, Macl. 



The remaining species of the genus are R. puella and R. phbius 

 of Chaudoir; R. (Omaseus) arnhpimensis, Casteln. ; R. angustulus, 

 R. (Omaseus) jroggatti and R. mastersi of Macleay ; and R. 

 cardtvellensis, Blkb. 



R. puella and R. plebias go with R. miser, of which, it being a 

 species subject to variation in size, they are likely to prove 

 synonyms. 



R. arnheimensis 1 have seen in the Howitt Collection, at the 

 Melbourne University. It is a narrow species with the prothorax 

 cordiform, the sides being sinuate before the base ; I cannot 

 indicate its position in the genus. 



R. angustulus is allied to R. solidus. 



R. fro'jgatti : — I have ascertained, by inspection of the type, 

 that Omaseus froggatti, Macl., is a Rky lister nus, but I cannot 

 now tabulate it. 



R. mastersi : — I have a specimen from the Gayndah district in 

 Queensland, but apart from the prothorax being slightly less 

 sinuate behind than is usual in R. liopleurus, Chaud., can find no 

 differences between them. I think it synonymous Avith R. 

 liopleurus. 



R. cardwellensis I have seen in the collection of Mr. C. French, 

 but I cannot now place it with any confidence. 



Rhytisternus SOLIDUS, n.sp. 



Elongate, robust, convex ; prothorax ti-ansverse, narrowed 

 behind, sides I'ounded, not sinuate before base : elytra with four 

 inner stripe strongly impressed. 



Black, shining ; labrum, antennte, palpi and tarsi reddish-piceous. 

 Head large, smooth ; front strongly impressed ; the impressions 



