108 MISCELLANEOUS STUDIES 



Davidson reported a species of Aphis infesting the terminal leaves 

 of wild currant in the canyons of Contra Costa County. He identified 

 it provisionally as this species as he was uncertain. The author is 

 unacquainted with it. 



127. Aphis lithospermi Wilson 



Wilson, Trans. Am. Ent. Soc., vol. 41, p. 100, 1915 (orig. desc.). 

 Record. Lithospermum pilosum; California (Wilson). 



There is no definite record of this species in California, but it is 

 listed here because Wilson added it to a list of the California Aphi- 

 didae submitted to him by the author. 



128. Aphis maidis Fitch 



Figures 216 to 218 



Fitch, Insects N. Y., vol. 1, p. 318, 1855 (orig. desc.). 

 Clarke, Can. Ent., vol. 35, p. 251, 1903 (list). 

 Davidson, Jour. Econ. Ent., vol. 5, p. 408, 1912 (list). 



Records. Corn; Watsonville, Berkeley (Clarke); San Jose (Davidson); Lake- 

 side, San Diego County, April, 1916; Chula Vista, San Diego County, August, 

 1916: sorghum; Julian, San Diego County, August, 1916 (H. M. Armitage) ; 

 Corona, Eiverside County, September, 1916. 



Only occasionally is this corn aphis found in California, where it 

 infests the ears and tassels and leaves of corn and some of the sor- 

 ghums. Never has it been observed as injurious as is sometimes 

 reported from the middle western states. 



129. Aphis malifoliae Fitch 



Figures 248 to 250 



Fitch, Trans. N. Y. State Agr. Soc., vol. 5, p. 14, 1854 (orig. desc.). 

 Clarke, Can. Ent., vol. 35, p. 252, 1903. Aphis sorbi Ka.lt. (list). 

 Games, Mon. Bull. Cal. Comm. Hort., vol. 1, p. 400, 1912. A. sorbi Kalt. 



(list). 

 Weldon, Mon. Bull. Cal. Comm. Hort., vol. 3, p. 188, 1914. A. sorbi Kalt. 



(list). 

 Baker and Turner, Jour. Agr. Ees., vol. 7, pp. 321-343, 1916 (complete 



account). 



Records. Pyrus mdlus, P. communis; Central and northern California; Orange 

 County, May, 1917. 



