THE SYRPHIDAE OF OHIO 



A Biologic, Economic, and Systematic Study of the 



Family in the State 



BY 



Clell Lee Metcalf, M. A. 



Extracted from a Thesis Presented to the Faculty of the College of Arts, Philosophy and Science of the Ohio 

 State University as the Thesis Requirements for the Degree of Master of Arts, Commencement, June. 1912. 



