PLATE 22 
A. — Aphis malijoliae: Summer wingless form. 
B. —Aphis malifoliae: Oviparous female. 
C. —Structural details of Aphis malifoliae, A, sorbi , and A. kochii. 
a, A. sorbi: Segment VI of antenna of winged form. 
b, A. malifoliae: Cornicle of spring wingless form. 
c, A. malifoliae: Cornicle of summer wingless form. 
d, A. malifoliae: Cauda of summer wingless form. 
e, A. malifoliae: Cauda of spring wingless form. 
f, A. malifoliae: Segment VI of antenna of winged form. 
g, A. malifoliae: Segment,VI of antenna of stem mother. 
h, A. kochii: Segment VI of antenna of winged form. 
i, A. sorbi: Cauda of winged form. 
j, A . kochii: Cornicle of spring migrant. 
k, A . sorbi: Cornicle of spring migrant. 
l, A. malifoliae: Cornicle of spring migrant. 
m , A. sorbi: Segment III of antenna of spring migrant. 
n, A. malifoliae: Segment III of antenna of spring migrant. 
