VOL. IX. Ser. A. Part J.— pp. 97-144. 



MARCH, 1921. 



THE REVIEW 

 OF APPLIED 

 ENTOMOLOGY 



SERIES A: AGRICULTURAL. 



( APR 1 1 192 ; 



ISSUED BY THE IMPERIAL 

 BUREAU OF ENTOMOLOGY. 



LONDON. 



THE IMPERIAL BUREAU OF ENTOMOLOGY. 



41. QUEEN'S GATE. S.W.7. 



PHoa 18. 4d. n«t. 



All Rights Reserved. 



