ILool 



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ENTOMOLOGY 



WITH SPECIAL RFFFRENCI IX) 



ITS ECOLOGICAL ASPECTS 



BY 



JUSTUS WATSON FOLSOM, Sc.D. (HARVAR 



ASSISTANT PROFESSOR OP ENTOMOLOGY AT THE UNIVERSITY OF ILLINOIS 



THIRD REVISED EDITION 

 WITH FIVE PLATES AND 308 TEXT-FIGURES S \ 



PHILADELPHIA 



P. BLAKISTON'S SON & CO. 



1012 WALNUT STREET 



