442 STUDIES IN AUSTRALIAN ENTOMOLOGY, 



elongate, linear at bottom ; the external shorter, wide, straight, 

 well defined ; space between internal basal impressions depressed, 

 slightly convex, defined anteriorly by a light arcuate transverse 

 impression ; space between external impression and lateral border 

 convex and bearing at its base the posterior marginal puncture. 

 Elytra oblong, wider than prothorax (l'2-5 x 7 ■3 mm.), sub- 

 parallel on sides, truncate on base, convex ; sides shortly and 

 decidedly narrowed to base ; apical curve lightly and widely 

 sinuate on each side ; stria? simple, deeply impressed, sixth not 

 attaining basal border, seventh strongly impressed on apical third, 

 becoming obsolete towards base ; six inner interstices strongly 

 convex for their whole length ; seventh and eighth separately 

 convex on apical third, becoming united towards base ; ninth 

 narrow, convex, ocellate-punctate along course of eighth stria, 

 the punctures closely placed near shoulder, a single widely 

 separated one at about anterior third, eight irregularly separated 

 (mes on apical half; lateral border strongly reflexed ; basal border 

 with posterior margin almost straight (hardly curved) on each side, 

 a short lightly upturned projection at humeral angle ; marginal 

 channel narrow behind shoulder, becoming wider to apical sinuosity. 

 Prosternum rounded on base, not margined ; episterna almost 

 laevigate, obsoletely rugulose. Ventral segments smooth; second 

 and third obsoletely punctulate laterally near the posterior 

 trochanters ; a narrow convex raised space along anterior margin 

 of three last, giving them a wideh' transverseh^ impressed appear- 

 ance. 



Length 20, breadth 7'3 mm. 



Hah. — North Queensland, Gulf of Carpentaria. (A single 

 specimen given to me by Mr. C. French.) 



A very distinct species and the largest of the genus. It is 

 thoroughly differentiated from all the described species of the. 

 genus by the strong convexity of the six inner elytral interstices, 

 and the almost absolutely smooth prosternal episterna, on which, 

 however, a slight wavy rugulositv is discernible with a lens. It 

 is the only R]iytisler)ms known to nie with dentate humeral 

 angles. 



