Puant Lice I[nyurtna FouiIAGE AND Fruit oF THE APPLE 753 
distal ends of the tibiae, and the tarsi, are dusky; the cornicles are yellowish 
green, dusky to black at their tips. The cornicles are similar in shape 
to those of the first instar of the preceding generation. 
Later instars.— The remaining instars are similar in all essential mark- 
ings to the first and require no special description. 
Mature viviparous female.— The general color of the mature female 
is light yellowish green, with a distinct mid-dorsal green stripe as in the 
stem mothers; the distal half of the antennae is dusky; the eyes are black; 
the basal half of the cornicles is yellowish green, the tips are dusky. The 
cornicles are cylindrical, slightly constricted at base and tip, the distal 
ends flaring. On the sides of the anterior abdominal segments a whitish 
pulverulence is often present. © 
The third generation 
Normally there are comparatively few individuals of the third generation. 
All of them become winged and migrate to their summer host plants. 
The habits and characteristics of this generation are similar to the pre- 
ceding and need no further discussion. 
Description of stages 
The nymphal stages differ in no essential from those of the preceding 
wingless generation. The developing wing pads readily distinguish 
the forms that are to acquire wings, but their color markings are essentially 
the same. . 
Winged viviparous female, spring migrant (Plate XX VII).— The winged 
female measures from 1.6 to 2 mm. long. The general color is dark 
green; the head, the antennae, the pronotum, and the thoracic lobes are 
dark olive-brown to black; the pronotum is margined in front and behind 
with yellowish green to dark green; on each side of the abdomen are 
three distinct black spots; at the base of the abdomen is a prominent 
transverse black stripe; the cornicles are brown to black, with a dark, 
almost black, area around the base; the legs are yellowish green except 
the tips of the femora and the tibiae, and the tarsi, which are dusky to 
black. . The cornicles are cylindrical, constricted at the base and before 
the tips, which are flared somewhat irregularly (fig. 115, B, page 706). The 
antennae are shorter than the body and bear many characteristic sensoria 
i 
