Biological Control in W'estern Ai'stralia. 
17 
ACKNOW'LBIXCMHNTS. 
In the preparation of this paper, 1 ai'n inucli indebted to the late Mr. L. J. 
Newman, whose long association with the entomology of the State rendered 
his ready suggestions and advice always of very great value. 
To Messrs. Toop and Twaddle, Veterinary Officers of the Department of 
Agriculture, my thanks are due for helpful information concerning stock pests 
in the northern portions of the State and to Mr. T. O. Campbell ot the C.vS.I.R. 
for assistance in identifying .specimens. 
