Notes on Insects Damaging Sugar Cane in Queensland. 41 



Class II. — Slightly Injurious Species. Macl. 



(49) Cockchafer Beetle {Lepidiota froggatti). 1 



(50) Cockchafer Beetle {Lepidiota, sp. No. 666). 



(51) " Elephant Beetle " (Xylotrupes australicus, Thomp.). 



(52) Djaiastid Beetle {Isodon puncticollis, Macl.). 



(53) Chaffer Beetle [Cacachroa decorticata, Macl.). 



(49) LEPIDIOTA FROGGATTI, Macl. (Family MELOLONTHIDAE). 

 Plate IV., Fig. 49, p. 34. 



Several 3rd stage larvje presumed by Girault to be grubs of this 

 species were found in a canefield at Innisfail, in 1912. 



(50) LEPIDIOTA, sp., No. 666 (Family MELOLONTHIDAE). 



Larv£e recorded from Bundaberg and Childers (July, 1914) occur- 

 ring under cane stools. Adult unknown. (See Queensland Bureau 

 Sugar Expt. Stations, Division Ent., Bull. No. 2, p. 37). 



(51) XYLOTRUPES AUSTRALICUS, Thomp. (Family DYNASTIDAE). 

 Plate IV., Fig. 51, p. 34. 



The large grubs of this well-known dynastid, commonly called 

 *' Elephant Beetle." feed mostly on vegetable humus, but are account- 

 able at times for minor injuries to cane roots. 



Description of Beetle. 

 Both sexes are of a uniform very deep reddish-black colour, but 

 differ in size and structure, the male as a rule being much larger, with 

 head and prothorax produced into a stout curved horn-like protruber- 

 ance of variable length, terminating in two prongs, while those of the 

 opposite sex are of simple form, and more coarsely punctate. This 

 species occurs freely in both Queensland and New South Wales, and 

 may often be seen on warm evenings buzzing around electric lights, 

 street lamps, etc. Length of male, about li/g inches. 



(52) ISODON PUNCTICOLLIS, Macl. (Family DYNASTIDAE). 

 Plate IV., Fig. 52, p. 34. 

 Occasionally attacks cane roots. 



Description of Beetle. 

 Uniform dark shining reddish-brown. Borders of suture forming 

 two slightly raised bands edged by a deep striation. Each elytron with 

 about 12 rows of coarse punctures, not parallel with suture. Prothorax 

 very finely punctate and slightlj^ hollowed horizontally in male just 

 behind frontal edge, the centre of which projects upwards vertically 

 in a single short blunt point. {See also page 16 of this bulletin). 



