BY ARTHUR M. LEA. 737 



paler than the preceding ones it is readily distinguished by the 

 sculpture of head, and under surface of abdomen, and by the 

 absence of an impression connecting the prothoracic fovese. 



The fovese on the head are placed exactly as on the four of a 

 die; the interocular ones are smaller than in the three preceding 

 species. There is an obtuse tubercle on each side of the meta- 

 sternum, but the tubercles, instead of being erect, are pressed flat 

 down, so that they overhang the hind coxee; in consequence they 

 are not readily seen, and at first they appear to be really attached 

 to the coxse. 



Rybaxis acutidens, n.sp. 



^. Of a bright pale castaneous, legs and palpi still paler, apical 

 two-thirds of antenn£e infuscated. Abdomen finely pubescent, 

 elsewhei'e almost or quite glabrous. 



Head rather large, with a fovea of moderate size close to each 

 eyQ, and with a rather vague interantennal impression. Antennte 

 with first joint subcylindrical, second subglobular, fifth slightly 

 longer than fourth, but scarcelj^ if at all, longer than sixth, 

 eighth very small, ninth larger and produced on one side, tenth 

 large, eleventh slightly narrower than tenth, but slightly longer 

 than ninth and tentii combined. ProtJiorax distinctly transverse, 

 sides strongly rounded and widest at about two-fifths from apex; 

 each side near base with a large fovea, the two connected by a 

 strongly impre.s.sed curved line, that is scarcely dilated at its 

 middle. Elytra ratlier wide; dorsal striae distinct almost to apex, 

 with small but fairly numerous and distinct punctures; epipleural 

 furroAv deep, lightly curved and extending to about one-fifth 

 from ba.se and apex, marginal stria rather deeper than usual. 

 Upper surface of abdomen with a very short oblique stria on each 

 side of the medio-basal node; lower surface slightly flattened in 

 middle. Metasternum concave along middle. Front trochanters 

 each with a long thin tooth; front tibise moderately curved, the 

 four hind ones longer and more noticeably curved, the hind pair 

 spinose at apex. Length 1^-1| mm. 



Hah. — W. Australia : Bunbury, Vasse River(A. M. Lea). 

 57 



