INSECTS INJURIOUS TO STONE FRUITS 663 



marked with three longitudinal stripes of a darker green. The 

 honey-tubes are short, thick, and slightly constricted at the base. 



a b c 



FIG. 509. The mealy plum louse (Hyalopterus arundinis Fab.): a, young 

 nymph; b, last stage of nymph of winged form; c, winged viviparous 

 female all much enlarged. (After Lowe.) 



The winged female is similar in coloration except that the abdomen 

 bears several transverse triangular marks of darker green. In 



FIG. 510. Mealy plum aphides clustered on leaf. (After Lowe.) 



June the winged females migrate to certain grasses upon which 

 the aphides reproduce during the summer, though small colonies 

 are to be found on the plvlm throughout the summer. In the 



