The Aphididae of Nebraska 91 



Mon. Brit. Aph. — A Monograph of British Aphides (G. B. 

 Buckton). 



Mon. Pfian. — Monographic der Familien der Pflanzenlause (J. 

 H. Kaltenbach). 



Psyche, Cambridge, Mass. 



Proc. Ent. Soc. Phil. — Proceedings of the Entomological Society 

 of Philadelphia. 



Syn. Aph. Minn. — Synopsis of the Aphididae of Minnesota (O. 

 W. Oestlund). 



Syst. Nat. — Sy sterna Naturae (C. Linnaeus). 



Trans. Am. Ent. Soc. — Transactions of the American Entomo- 

 logical Society. 



Trans. N. Y. Ag. Soc. — Transactions of the New York Agricul- 

 tural Society. 



U. S. Ag. Rep. — Report of the United States Department of 

 Agriculture. 



•75 



