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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
Bibliography 
No attempt has been made by the writer to include the sum of the 
writings on the various species concerned, but rather those papers 
which deal with alternate host habits. 
Beet Aphis (Pemphigus hetce Doane) 
1914. J. R. Parker. The Life History of the Sugar-beet Root-louse (Pemphigus 
hetce Doane). Journ. Econ. Ent. VII, 1. 
* ____ _____ _ 
Apple and Pear Woolly Aphids (Eriosoma lanigerum Hausmann and E. pyr - 
icolum Baker & Davidson) 
\ 
1912. E. Patch. Elm Leaf Curl and the Woolly Apple Aphis. Me. Agric* 
Exp. Sta. Bull. 203. 
1912. E. Patch. Woolly Aphid Migration from Elm to Mountain Ash. Journ. 
Econ. Ent. V, 5. 
1915. A. C. Baker. The Woolly Apple Aphis. U. S. D. A. Office of Secretary 
Report, 101. 
1915. A. C. Maxson. A Schizoneuran migrating from Elm to the Apple (Homop.). 
Ent. News. XXVI, p. 367. 
1916. E. Patch. Elm Leaf Rosette and Woolly Aphid of the Apple. Me. Agric. 
Exp. Sta. Bull. 256. 
1916. A. C. Baker & W. M. Davidson. The Woolly Pear Aphids. Journ. Agric. 
Res. VII, 11. 
1917. A. C. Baker & W. M. Davidson. A Further Contribution to the Study of 
Eriosoma pyricola, the Woolly Pear Aphis. Jour. Agric. Res. X, 2. 
1917. W. M. Davidson. The Pear Woolly Aphis. Mon. Bull. Cal. Hort. Comm. 
VI, 10. 
Hop Aphis (Phorodon humuli Schrank) 
1913. W. B. Parker. The Hop Aphis in the Pacific Region. U. S. D. A. Bur. 
Ent. Bull. 111. 
Clover Aphis (Aphis bakeri Cowan) 
1908. J. J. Davis. Studies on Aphididse I. Ann. Ent. Soc. America, I, 4. 
1915. E. Patch. Two Clover Aphids. Journ. Agric. Res. Ill, 5. 
Potato Aphis (Macrosiphum solanifolii Ashmead) 
1911. E. Patch. Two Species of Macrosiphum. Me. Agric. Exp. Sta. Bull. 190. 
1915. E. Patch. Pink and Green Aphid of Potato. • Me. Agric. Exp. Sta. Bull. 242. 
1917. J. S. Houser, T. L. Guyton, and P. R. Lowry. The Pink and Green Aphid 
of Potato. Ohio Agric. Exp. Sta. No. 317. 
The English Grain Aphis (Macrosiphum granarium Kirby) 
1916. W. J. Phillips. Macrosiphum granarium, the English Grain Aphis. Journ. 
Agric. Res. VII, 11. 
The Oat Aphis (Aphis prunifolice Fitch, avence of authors). 
1914. J. J. Davis. The Oat Aphis. U. S. D. A. Bur. Ent. Bull. 112. 
1917. A. C. Baker. The Correct Name for our Apple-Grain Aphis. Science 
N. S. XLVI, 1191. 
The Southern Plum Aphis (Aphis setarioe Thomas) 
1910. C. E. Sanborn. The Southern Plum Aphis. Okla. Agric. Exp. Sta. Bull. 88. 
