376 



Two specimens in the Australian Museum, Sydney, be- 

 long to sub-sect, iv., as tabulated, (3 > and come nearest to P. 

 thy me.lo ides, Macl., which is a more oval and convex insect. 

 Type in Australian Museum, Sydney. 



Hel^eus bimarginatus, n. sp. 



Elongate-ovate ; opaque-brown ; sparsely clothed with short 

 scaly hairs of a rusty-red colour; legs and tarsi more densely 

 but similarly clad. 



Read setose, with a few large punctures; a transverse 

 sulcus in front of the eyes, the latter approximate and nearly 

 concealed by prothorax; antennae, with joint 3 as long as 4-5-6 

 combined, 4-7 obconic, 8 triangular, 9-10 very transverse, 

 11 nearly round. Prothorax 8*5 x 12 mm., the anterior pro- 

 cess wide but pointed, not meeting at apex, widest and 

 bisinuate at base, sides evenly and arcuately converging to 

 apex, explanate margins wide and oblique, its extreme edge, 

 viewed sideways, laminate, posterior angles acute ; surface 

 setose and finely pustulose with raised nitid central carina, 

 faintly undulate in outline, raised and rostrate behind ; not 

 quite extending to the anterior margin. Scutellum trans- 

 versely triangular. Elytra of same width as prothorax at base, 

 subparallel on anterior half, widely rounded behind ; humeral 

 angle obtuse and prominent; margins strongly reflexed and 

 vertical, following the humeral angle at base as far as the 

 lateral row of pustules, the apical half of margin branching and 

 duplicated to the apex, this double border irregularly crenu- 

 lated and separated by a sulcus, but uniting again at a some- 

 what nodulose apex ; the edges of elytra, viewed sideways, 

 vertical, with a crenulate margin above and below (the lower 

 formed by the epipleural fold), this vertical edge gradually 

 widening towards apex, from less than \ mm. at the shoulders 

 to nearly 2 mm. at the apex ; the whole margin strongly up- 

 turned with a wide concavity within, this concavity deepest 

 and most marked at apex ; disc bicostate with two slightly 

 crenulate and nitid costse, diverging at but not quite reaching 

 base, parallel on anterior two-thirds, converging on apical 

 declivity, again parallel and continuous almost to extreme 

 apex, there terminating in a raised acute tooth ; a lateral row 

 of conical pustules, distinct and separated, extending from the 

 humeral region to apex. Under-side roughly shagreened, setose 

 with patches of red indumentum, epipleuras nearly smooth, 

 prosternum rugose, with a central carina and anterior margin 

 subnodulose. Dimensions — 23 x 12'5 mm. 



Hah. — Western Australia: Lake Austin (H. Brown). 



(3)Proc. Linn. Soc, N.S.W., 1911, p. 180. 



