BY A. RAFFRAY. 149 



latitudine sua paulo longiora, humeris obliquis et subcallosis. 

 Abdomen elytris paulo angustius et leviter brevius, basi haud 

 angustatum, lateribus longius carinatis, segraento l°breviori, fere 

 transverso, carinulis mediis leviter intus arcuatis et fere conver- 

 gentibus et mediam partem disci includentibus, disco inter eas 

 magis depresso. 



£. Metasternum longitudinaliter impressum, utrinque delicatule 

 carinatum et juxta apicem minute foveolatum. Long. L80 mm. 



Forest Reefs, N.S.W. (Mr. A. M. Lea). 



Genus Rybaxis, Saulcy. 



Spec. ii. p. 9G; Raffray, Rev. d'Ent. 1890, pp. 118 and 123. 



The name of Rybaxis was given by de Saulcy as a subgenus of 

 Bryaxis to some insects of the palsearctic fauna which must be 

 considered as generically distinct. 



The prothorax bears always a transverse furrow more or less 

 angulate in the middle and joining together the lateral and basal 

 fovea? when the latter one exists; the elytra have always a well 

 marked dorsal stria and a furrow on the deflexed side of the 

 elytron, close to the lateral margin. 



This genus proves to be extensively distributed, being met with 

 in every part of the world. It is particularly numerous in Aus- 

 tralia, while the genera Bryaxis and Reichenbachia have not been 

 found there, as far as I know. 



The Australian species of Rybaxis may be easily divided into 

 two groups : in the first one the transverse furrow of the pro- 

 thorax is well defined and the median fovea very small and even 

 sumetimes wanting, at the base of the elytra there are only two 

 fovese and the general form of the body is short, broad and 

 convex; in the second group the transverse furrow of the pro- 

 thorax is very faint and seems even interrupted, the median 

 fovea is very strong and generally somewhat transverse, at the 

 base of the elytra are generally four fovese, the body is more 

 elongate, parallel and depressed, the prothorax more decidedly 

 cordate. 



