PLATE LXXIV 
Structural details of Aphis pomi, A. avenae, and A . malifoliae: 
Fig. i.— Aphis pomi: Antenna of wingless viviparous female, adult. 
Fig. 2.— A. pomi: Antenna of wingless viviparous female, third instar. 
Fig. 3.— A. pomi: Antenna of wingless viviparous female, second instar. 
Fig. 4.— A. pomi: Antenna of wingless viviparous female, first instar. 
Fig. 5.— A. pomi: Antenna of stem mother. 
Fig. 6.— A. pomi: Antenna of intermediate. 
Fig. 7.— A. pomi: Antenna of winged viviparous female. 
Fig. 8.— A. pomi: Male genitalia. 
Fig. 9.— A. pomi: Antenna of male. 
Fig. 10.— A . pomi: Antenna of wingless viviparous female, fourth instar. 
Fig. 11.— A. pomi: Cornicle of winged viviparous female. 
Fig. 12.— A. pomi: Cornicle of wingless viviparous female. 
Fig. 13.— A. pomi: Cornicle of male. 
Fig. 14.— A. pomi: Cornicle of oviparous female. 
Fig. 15.— A. avenae: Antenna of stem mother, first instar. 
Fig. 16.— A. pomi: Antenna of stem mother, first instar. 
Fig. 17.— A. malifoliae: Cornicle of winged viviparous female. 
Fig. 18.—A. avenae: Cornicle of winged viviparous female. 
Fig. 19.—A. pomi: Cauda of adult. 
Fig. 20.—A. pomi: Hind tibia of oviparous female. 
Fig. 21.—A, pomi: Cauda of pupa. 
