BY ARTHUR M. LEA. 745 



•eleventh ovate, slightly longer than the three preceding joints 

 -combined. Prothorax strongly transverse, sides strongly rounded, 

 widest close to apex; with a rather large, and somewhat trans- 

 •\'erse fovea, on each side near base, and with a small round 

 median one; with numerous small punctures, ^/y^va moderately 

 transverse; dorsal striae distinct, more noticeably curved than 

 usual, and terminating at apex itself close to the suture; with 

 numerous small punctures; marginal stria distinct but epipleural 

 furrow absent. Abdomen somewhat flattened along middle of 

 under surface, the apical segment with a rather shallow longi- 

 tudinal impression. Metasternum rather widely concave in 

 middle; but the depression closed posteriorly. Four front tro- 

 chanters obtusely dentate; tibiae rather long. Length 1-li mm. 



Hah. — Queensland : Cairns(H. Hacker's No. 204). 



In general appearance fairly close to R. electrica, but the 

 middle trochanters distinctly dentate, and tenth joint of antennae 

 ■much smaller, so that the eleventh appears to be conspicuously 

 larger, although it is about the same size in both species; and, in 

 fact, tiie club appears to be one-jointed only. 



The cephalic fovese are placed as in the preceding species, but 

 the two have little else in common. The three prothoracic foveas 

 are disconnected, but from some directions a faint impression can 

 be seen proceeding inwards from each of the -lateral fovese, but 

 not quite touching the median one. 



Rybaxis macrocephala, n.sp. (Plate xxi., tig.4). 



^. Bright reddish-castaneous; elytra and appendages slightly 

 paler. With short, pale pubescence. 



Head much larger, wider, and more convex than usual; with a 

 small fovea fairly close to each eye,butnot depressed between anten- 

 nae; with rather dense distinct punctures. Antennae with third 

 and fourth joints slightly shorter than second and fifth, sixth to 

 ninth still shorter, tenth larger and somewhat transverse, eleventh 

 large, ovate, about as long as the four preceding joints combined. 

 Prothorax distinctly transverse, sides widest and strongly rounded 

 towards apex; with dense clearly defined punctures; with a fairly 



