742 AUSTRALIAN AND TASMANIAN PSBLAPHID^, 



turity. The first joint of the antennae is really distinctly longer 

 than the second, but as its base is more or less concealed from 

 certain directions, it appears to be even shorter than the second, 

 or at least no longer. Between the antennae, from some direc- 

 tions, there may be seen three impressions, the ordinary one but 

 of rather smaller size than usual, and a smaller foveate one quite 

 close to the base of each antenna, the three being obscurely con- 

 nected together. 



A male from Mount Wellington differs from the typical form 

 in having the interocular fovese open in front (from some direc- 

 tions, however, they appear closed), the elytra with more distinct 

 punctures (especially near suture), and the dorsal striae more 

 distinct and longer. As in all other respects, however, even as 

 to the longer hairs scattered about (an unusual feature in the 

 genus), it agrees with the typical form, it is not considered 

 advisable to regard it as more than a variety. 



Rybaxis ACANTHOSTBnNA, n.sp. (Plate xxi., fig.3). 



(J. Of a rather dark I'eddish-castaneous, elytra and appendages 

 paler. Moderately clothed with short, pale pubescence. 



Head with a fairly large, round, deep fovea, close to each eye, 

 and a moderately deep depression between antennae. Antennae 

 rather long, first joint stout, second shorter than third and scarcely, 

 if at all, wider, fifth slightly longer than fourth and sixth, seventh 

 and eighth shorter, ninth longer and wider, tenth distinctly longer 

 than wide, eleventh very decidedly curved, its inner base concave. 

 Prothorax moderately transverse, sides widest and strongly 

 rounded at about apical third; each side near base with a large 

 fovea, the two connected by a strong curved impression, which 

 is di-awn backwards, but scarcely foveate, at its middle. Elytra 

 about as long as wide; dorsal strias deep at base and distinct to 

 beyond the middle; punctures rather indistinct; epipleural furrow 

 deep, lightly curved, and extending to about one-fifth from base, 

 and one-fourth from apex. Undersurface of abdomen concave in 

 middle, a distinct tubercle projecting backwards from each side 

 of the depression on third segment. Metasternum gently and 



