New YorkState Museum Bulletin 



Entered as second-class matter November 27, 1915, at the Post Office at Albany, New York, 



under the act of August 24, 1912 



Published monthly by The University of the State of New York 

 No. 200 ALBANY, N. Y. August i, 1917 



The University of the State of New York 



New York State Museum 



John M. Clarke, Director 



KEY TO AMERICAN INSECT GALLS 



By EPHRAIM PORTER FELT D. Sc. 



PAGE 



Introduction 5 



Key 15 



Bibliography 232 



Explanation of plates 243 



Index 275 



