BENEFICIAL VERSUS INJURIOUS INSECTS. 
There are many Lamellicorn beetles whose larve attack the roots 
of sugar cane in Queensland and New South Wales. A parasitic wasp 
(Dielis formosa Guer.), of the family Scoliide, and known as a Digger 
wasp, burrows down through the soil, and the female stings the grub 
and deposits a single egg on its under surface. ‘When the egg hatches, 
the larva buries its head within the beetle grub and lives on its contents. 
“A similar wasp, S. manila, has been introduced from the Philippines 
into Hawaii, and is successfully controlling the white grubs of Anomola 
orientalis. 
A common pest in our gardens is the cabbage aphid, and in New 
South Wales the introduced parasite Lepolexs rape Curtis can be 
*yeadily collected. Many similar examples could be given, but sufficient 
has already been shown that Australia, with abundance of material, has 
not made use of her opportunities. 
In science, as in art, and, as I believe, in every other 
sphere of human activity, there may be wisdom in a multitude 
of counsellors, but it is only in one or two of them. . 
—HUXLEY, 
559 
