WHOLE VOL. APPLIED ENTOMOLOGY HOWARD 531 



In 1920 Apliclinus inali was sent from the United States to Uru- 

 guay, and the insect was speedily reared and acchniatized and holds 

 the woolly root-louse of the apple in check. Colonies of this para- 

 site were sent from Uruguay to Argentina, Chile, England, Italy, 

 and Germany. 



WORK IN ENGLAND FOR THE BRITISH COLONIES 



We have elsewhere referred to the founding of the Parasite Lab- 

 oratory of the Imperial Bureau of Entomology at Farnham Royal, 

 England. This Bureau, supported largely by the Empire Marketing 

 Board, was established for the purpose of breeding parasites that 

 might be useful to the different British colonies or dominions. Dr. 

 S. A. Neave was the first Director of the Laboratory, but was later 

 succeeded by Dr. W. R. Thompson, for a number of years in charge 

 of the United States Bureau of Entomology laboratory at Hyeres, 

 France. 



An article entitled " Breeding of Beneficial Parasites " was pub- 

 lished in the journal Science February 8, 1929, which gave an account 

 of the work of the Parasite Laboratory of the Imperial Bureau of 

 Entomology. It was stated that parasites of the pine Tortrix, the 

 greenhouse white fly, and of the Coccid, Lccanhim coryli, had been 

 sent to Canada ; Rliyssa pcrsuasoria, a parasite of Sirex, to New Zea- 

 land ; three species of parasites of the pear slug to New Zealand and 

 Australia ; a parasite of the woolly apple aphis to India and Kenya, 

 and parasites of the earwig to New Zealand and Canada. 



THE USE OF INDIGENOUS PARASITES : DR. THOMPSON'S PAPER 

 ON BIOLOGICAL CONTROL 



Except for its earlier paragraphs, this present chapter has dealt 

 almost entirely with international introductions of useful insects. 

 Little, in fact, has been done of comparatively recent years in the 

 transfer of parasites from a point where they are abundant to points 

 where they are scarce or absent in the same country or in the same 

 general area. Nothing has been said, moreover, about the intensive 

 breeding of parasites in enormous numbers for ])ractical use in the 

 same general locality. 



Reference has been made many times to the old European gar- 

 deners' practice of collecting ladybirds (Coccinellidae) and placing 

 them on plants subject to attack from aphids. And the suggestion 

 was made by many early authors that the parasitized larvae or pupae 

 of certain injurious insects be kept to allow the parasites to escape. 



