Register f a at the G.P.O. for Transmission to Canada ana Newfoundfana Bv Magazine Post. 



VOL. n. Ser. B. Part 5.— pp. 73.88, MAY, 1921. 



THE REVIEW 

 OF APPLIED 

 ENTOMOLOGY 



SERIES B: MEDICAL 

 AND VETERINARY. 



ISSUED BY THE IMPERIAL 

 BUREAUQE_ENTOMOLOGY. 



LONDON 



THE IMPERIAL BUREAU OF ENTOMOLOGY 



4 1. QUEEN'S GATE. S.W. 7. 



Price 8d. net. 



All Rights Reserved. 



