BIOLOGICAL STUDIES ON THREE APHIDIDiE. 155 



1893. OsBORN, H., and Sirrine, F. A. — Notes on Aphididte. <ri-oc. Iowa Acad. 



Sci. for 1892, Des Moines, Vol, I, pt. 3, p. 98. 



Aphis maidis Pitch, abundant on corn, l)room corn, and sorshum in Iowa. 



ISBJ). Forbes, S. A. — Eigliteeutli Report of the State Entomologist of Illinois. 

 <Trans. Dept. Agr. 111. for 1893, Springfield, Vol. XXXI, pp. 69, 70, 73, 

 74, 82. Separate : Springfield, 111., 1894. 



Aphis maidis Fitcli. Distinguislies between this and the com root-apliis ; 

 disappearance in the fall ; earliest appearance (July 23, 1883) ; relation to 

 the corn root-aphis ; transferring to roots of plants. 



1894. OsBORN, H. — Corn insects, their injnries, and how to treat them. <Iowa 



Agr. Exp. Sta., Des Moines, Bui. 24, pp. 991-1005, fig. 9. 



Brief notes on the corn leaf-aphis, with suggestions as to remedies. 



1895. CowEN, J. H. — A preliminary list of the Hemiptera of Colorado. <Colo. 



Agr. Exp. Sta., Fort Collins, Bui. 31, Tech. Ser. 1, p. 120. 



Aphis maidis Fitch. Collected at Fort Collins, Colo., September 14, on 

 maize, and at Hotchkiss, Colo., July 27. 



1895. Weed, H. E. — Insects injurious to corn. <Miss. Agr. Exp. Sta., Agricul- 



tural College, Bui. 36, p. 158. 



Mentions that Aphis maidis can generally be found in the cornfields, though 

 it rarely occurs in numbers sufficient to cause extensive damage. 



1896. Hopkins, A. D., and Rumsey, W. E. — Practical entomology. <W. Va. 



Agr. Exp, Sta., Charleston, Bui. 44, pp. 281, 308-309. 



Mention of the leaf-aphis, and remedial measures. 



1900. Harvey, F. L. — -Notes on the insects of the year 1899. < Sixteenth Ann. 



Rep. Maine Agr. Exp, Sta., Augusta, p. 30. 



The corn aphis (Aphis maidis) was abundant on sweet corn in some parts 

 of the State. 



1900. Lugger, O. — Bugs injurious to cultivated plants. <Minn. Agr. Exp. Sta., 



St. Paul, Bui. 69, December, 1900, p. 184, fig. 154. 



Mentions the corn leaf-aphis as infesting the upper parts of corn plants, 

 with note's on the i-elations of the ants and root aphides. (Quotes Comstock. ) 



1901. Hunter, W. D. — The Aphididse of North America. <Iowa Agr. Exp. 



Sta., Ames, Bui. 60, September, 1901, p. 98. 



Lists Aphis maidis Fitch from Iowa; gives bibliography; States in which 

 it has been found ; food plants. 



1902. Washburn, F. L. — Insects notably injurious in 1902. <Minn. Agi". Exp. 



Sta., St. Anthony Park, Bui. 77, p. 64, fig. 1.55. Also as Seventh Ann. 

 Rep. State Ent. Minn. 



Brief notes on Aphis maidis Fitch (root and aerial forms) as occurring in 

 Minnesota ; remedies suggested. 



1903. Clarke, W. T.— A list of California Aphidid*. <Can. Ent., London, Ont., 



Vol. XXXV, p. 25. 



Lists Aphis maidis from Berkeley and Watsonville, Cal., on corn and 

 sorghum. 



1904. Sanborn, C. E. — Kansas Aphidida, with a catalogue of North American 



Aphidida^, and with host-plant and plant-host list. < Ivans. Univ. Sci. 

 Bui., Lawrence (pt. 1), Vol. Ill, No. 1, July, 1904, p. 58, fig. 66; (pt. 2) 

 Vol, I, No. 8, April, 1906, p. 258. 



Description of winged viviparous female of Aphis maidis. Gives food 

 plants as tictaria ylauca, Horghum halepense, and Zea mays. 



