Registered at the G. P.O.- /or Trait^wieaion tu Canada and- Newfoundland k-p Magazine Post. 



VOL. IX. Ser. B. Pari 2. pp. 25^40. 



FEBRUARY, 1921. 



The review 



OF APPLIED 

 ENTOMOLOGY ^i^*""- 



/ MAR 2 3 1921 



\JV. 



^«>t»l *«<&»«'" 



SERIES B: MEDICAL 

 AND VETERINARY. 



ISSUED BY THE MPERIAL 

 BUREAU OF ENTOMOLOGY. 



LONDON. 



THE IMPERIAL BUREAU OF ^NTOMOUOGY 



4 I , QUEEN'S GATE. S.W. 7. 



Ppioa^ adi nat. 



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