65 



termediate position between Carenum and Mr. Macleay's new 

 genus Calliscapterus. The following are strongly marked cha- 

 racters in this insect, viz., the very transverse head and slender 

 antennae, the narrow lateral margin of the thorax suddenly 

 dilated and turned upwards at the hind angles, the peculiar 

 basal area of the elytra, the middle portion only of which is 

 abruptly declivous and quite devoid of puncturation, and the 

 remarkable series of rather large faintly-impressed pits along 

 either side of the suture, which, however, may possibly be a 

 deformity, more particularly as they are more strongly defined 

 on the right than on the left elytron. On the anterior tibiae 

 the external ridge has four teeth above the apical two large 

 ones, of which the lowest is visible when the tibia is viewed 

 from a point perpendicular to its upper surface, the topmost 

 tooth being a mere indentation scarcely noticeable but by its 

 seta ; the inferior ridge bears eight blunt teeth, commencing 

 well back from the tarsus. The thickened humeral portion of 

 the elytral margin is erect. 



I think this species must resemble (7. ^oZ^Vw7/^, Westw., which, 

 however, would seem to be a broader insect with only two 

 visible external teeth on the front tibiae, and the elytra 

 differently coloured. 



I found a single specimen under a log of wood at Wallaroo 

 in September, 1886. 



DYTISCID^. 

 HTDEOCANTHTJS. 



H. Waterhousei, sp. nov. Oblongo-ovalis, posterius acuminatus, 

 transversim sat convexus, minus latus, nitidus, testaceo- 

 rufus, elytris antice seriatim obscure, postice fortius con- 

 fuse, puuctulatis ; prosterni pectorisque medio et coxarum 

 laminis fortius minus crebre punctulatis. Long., 6 mm. 

 This species is entirely different in colour from H. Aitstra- 

 lasice, Wehncke (the only Australian Sydrocantlius hitherto 

 described), and seems also to differ considerably in respect of 

 its puncturation. Each elytron has about four rows of lightly 

 impressed small punctures commencing close to the base and 

 extending about three quarters the distance to the apex. These 

 rows contain about 24< j^^^^^^^'^^ each, which are placed at 

 irregular intervals, three or four being close together and 

 followed by a space in which the rows seem interrupted, then a 

 few more punctures, and so on. The apical quarter of the 

 elytra is occupied by some sparing confused puncturation of a 

 rather coarser character. In addition to the above a strong 

 Coddington lens reveals a much finer system of punctures 

 spread tolerably evenly over the surface. The coarser 

 puncturation of the apical area extends a little forward on the 



