340 



Universitij of Californm Puhlications [Entomology 



Aphis maidis Fitch. A small dark green aphid received from 

 Bend, California, July 6, 1916, seriously infesting milo maize. 

 The common species on corn throughout the state, however, is 

 Aphis avenae Fab. 



Aphis medicaginis Koch (fig. 25). The adults are shiny black 

 with conspicuous whitish legs. Specimens were taken by the 

 WTiter at ^loorpark, California, August 11, 1911, where they were 

 doing great damage to the foliage and pods of the blaekeye bean. 



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Fig. 25. Apliis medicaginis Koch. Nj'mphs and adults on lemon leaf. 

 Sacramento, Cal., 1913. (Original.) 



Vigna catjaiig Walpers. It was also taken on the leaves of 

 lemon, Capitol Park, Sacramento, California, July, 1913. 



Apliis rniddlctomi Thos. A pale green and pulverulent species 

 first taken on the roots of rough pigweed, Amaranthus retroftcxus 

 Linn., and the roots of asters, Santa Paula, California, October 

 20, 1911. 



Aphis ncrii Fonsc. A pretty dark yellow and black species 

 common on the oleander during most of the year and also on 

 milkweed during the summer. On the campus it attacks oleander 

 and is specially abundant during the summer months on the 



