2/2 MAINE: AGRICULTURAL EXPERIMENT STATION. I914. 



LITERATURE CITED. 



Davis, J. J. 



191 1. Williams' "The Aphididae of Nebraska"; A 

 Critical Review, In University Studies, Lincoln, 

 Neb. V. II, no. 3. 



Dobrowljansky, W. W. 



1913. Zur Biologic der Blattlause der Obstbaume und 

 Beerenstraucher. Entomologische Station des 

 Landwirtschaftlichen Syndikats in Kiew. 



Gillette, C. P. 



1909. Plant Louse Notes, Family Aphididae. In 

 Jour. Ec. Ent. V. 2, p. 351-358. 



19 10. Plant Louse Notes, • Family Aphididae. In 

 Jour. Ec. Ent. V. 3, p. 403-407. 



Gillette, C. P., and Taylor, E. P. 



1908. A Few Orchard Plant Lice. In Bui. 133 Agr. 

 Exp. Sta. Colo. Agr. Col. 



Sanderson, E. Dwight 



1901 (02). Report of the Entomologist. In 13th 

 Ann. Rep't of Del. Col. Agr. Exp. Sta. 



Theobald, Fred V. 



1913. The British Species of the Genus Macrosiphum, 

 Passerini. In Journ. Econ. Biol. v. 8, no. 3. 



Thomas, Cyrus 



1879. Eighth Report of the State Entomologist of 

 the Noxious and Beneficial Insects of the State of 

 Illinois. 



Tullgren, Albert 



1909. Aphidologische Studien. In Arkiv for 

 Zoologi. Band 5, N :o 14. 



