132 



THE SPBING GEAIN-APHIS OR ' ' GREEN BUG. ' ' 



Toxoptera at Monet ta, S. C, in 1908. Dr. Riley states that he 

 found the larvae feeding on Macrosiphum granaria. 



Mr. Ainslie took quite a number of Allograpta obliqua Say in the 

 Southwest in 1907, and, though we can not say definitely that it 

 feeds upon Toxoptera, the chances are that it does, as Dr. Riley 

 states that it feeds upon Macrosiphum granaria. 



Mr. Kelly reared a number of Baccha clavata Fab. from Aphis 

 setarise at Wellington, Kans., in 1908; Mr. R. A. Vickery also reared 

 B. clavata from Aphis maidis at Brownsville, Tex., in 1911 ; Mr. J. J. 



Fig. io.—Sphxrophoria cylindrica, a fly reared from larvae attacking the spring grain-aphis in South Caro- 

 lina in 1907: a, Female fly; b, dorsal view of abdomen of male; c, hypopygium of male, lateral view. 

 Enlarged. (Original.) 



Davis reared this species at Lafayette, Ind., from Aphis medicaginis, 

 also in 1911. This species may in future be found to attack Toxop- 

 tera also. 



Lace-Wing Flies. 



The lacewing fly Chrysopa plorabunda Fitch was quite abundant 

 in the grain fields in the Southwest in 1907 and without doubt 

 assisted materially in the destruction of Toxoptera. This is the 

 most common species in this section of the country, where it hiber- 

 nates in the adult stage; thus, whenever the weather becomes suitable 

 it is ready to at once begin oviposition. An allied species is shown 

 in figure 46. 



The larvae of these insects can move about quite freely and are 

 provided with two long, curved mandibles (see fig. 46) upon which 



