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Wt-cs-otn 



O 



MEMO'\u 



OF I11E 



AMERICAN ENTOMOLOGICAL SOCIETY 



NUMBER 1 





THE CRESSON TYPES 



OF 



HYMENOPTERA 



BY 

 EZRA TOWNSEND CRESSON 



PUBLISHED BY THE AMERICAN ENTOMOLOGICAL SOCIETY 



AT THE ACADEMY OF NATURAL SCIENCES 



PHILADELPHIA 



1916 



