and Species o/*Heteromera. 21 



last character, and the rugosities on the flanks of the prothorax, 

 will immediately serve to differentiate the two species. 



Length 11 to 12 lines ; width of prothorax across the middle 

 3^ to 4^ lines ; width of elytra behind the middle 4f to 5 lines. 



Hob. Swan River and Champion Bay, West Australia. Six 

 examples. 



Var. acutangulata. 



Two examjjles from New South Wales slightly diiFer in 

 being a little smaller (10 lines), in liaving a distinct longitu- 

 dinal impression on the cheek, starting from the lower corner 

 of the eye beneath ; the striae on the elytra stronger than ordi- 

 nary, the intervals more convex and, at the sides and apex, 

 subnodulose. In one of the examples the prothorax is strongly 

 transverse, and the lateral thickened margin is abruptly ex- 

 panded (just below the ordinary notch behind the middle) into 

 a broad rounded tooth, and the hind angles are very acute. 



Note. The mandibles in H. orcus and H. ampliata have the 

 apex broadly and squarely truncated ; in all the other species 

 the apex is more or less strongly notched or bifid. 



Hypaulax tenuistriata, n. sp. 



Oblong, robust, black, shining. Labium deeply and widely 

 emarginate in front, with a tuft of hairs at apex of central 

 portion (between the palpi) ; mandibles strongly notched at 

 apex ; gular furrow strong, very near to the base of submentum, 

 a short longitudinal groove extending from base of submentum 

 to the gular furrow ; cheek-furrow broadly and deeply im- 

 pressed, extending obliquely from the upper edge of the eye 

 beneath to close to the gular furrow : mentuni more or less 

 transversely subcordiform, more or less densely clothed with 

 hairs (sometimes very sparsely so) ; the hairs shorter, finer, 

 and less intermingled than in any of the preceding that have 

 hirsute mentums : head and prothorax minutely (the former 

 very sparsely) punctulate ; crown sometimes impressed by an 

 irregular transverse line and by two small fovege, in others it 

 is a little more convex and smooth ; epistomal suture well 

 marked, angulatc at the sides : prothorax transverse, convex, 

 feebly emarginate at apex, and always narrower than at base ; 

 anterior angles not prominent ; sides more or less strongly 

 rounded to behind the middle, thence contracted in a curve 

 to the hind angles, which are moderately prominent and acute 

 and directed backwards ; base subsinuously truncated ; sides 

 finely margined or thickened, more or less crenulated, and 

 sometimes notched or interrupted at the middle, a little reflexed, 

 distinctly (though not broadly) channelled within the thickened 



