

The Insect Fauna of the 

 Genus Crataegus 



'** 





A THESIS 



PRESENTED TO THE FACULTY OF THE GRADUATE SCHOOL OF 



CORNELL UNIVERSITY FOR THE DEGREE OF 



DOCTOR OF PHILOSOPHY 



BY 



WALTER HOUSLEY iWELLHOUSE 



Reprinted from Cornell University Agricultural Experiment Station 



Memoir 56 

 Ithaca, N. Y. June 1922. 



