Puant Lice InJuRING FOLIAGE AND FRUIT OF THE APPLE 747 
page 706). The legs are long and slender, giving the wingless summer 
forms a slender and active appearance. 
The above description is based largely on the adult wingless females 
of the first, second, and third generations on plantain, counting the 
descendants of winged migrants as the first generation. Tho there is 
considerable variation in size, and frequently in color markings, of the 
wingless females of each generation, yet these are not of sufficient impor- 
tance to warrant special description. 
Summer winged viviparous female.— This form appeared in considerable 
numbers in some of the writer’s large rearing cages, which is in marked 
contrast to the results of Baker and Turner (1916 b). Descriptions of the 
fourth and the fifth (adult) instar follow. 
Fourth instar.— The general color is bright oa except for the legs, 
the cornicles, the antennae, the head, and the wing pads; the head, the 
legs, the cornicles, and the basal half of the antennae are yellow; the 
apical half of the antennae, and the eyes, are black; the basal part of 
the wing pads is yellow, the tips brown to black; the cornicles are slightly 
dusky at their tips. 
Fifth instar, adult.— Length 1.6 mm.; wing expanse 5 mm. 
The winged summer female is almost identical to the spring migrant 
in color characters. The quadrate black area on the dorsum of the abdo- 
men may be lacking in some cases, while in many others it is not so large 
as in the spring migrant. Otherwise there are no distinguishing char- 
acteristics. 
Autumn forms 
Late in the autumn there appear special winged forms which return 
to the apple. These are known as the autumn, or fall, migrants. They 
consist of winged viviparous females and winged males. They begin to 
appear in the region of Ithaca late in September, the winged females 
developing first. There is no general migration in the true sense of that 
term, as these winged forms continue to return to the apple thruout the 
latter part of September and the whole of October, reaching their maxi- 
mum, however, about the middle of the latter month. Stragglers also 
appear in November. The males begin appearing somewhat later and 
continue migrating to the apple well into November. 
