December, '08] 



JOrUXAL OF ECONOMIC ENTOMOLOGY 



361 



Winged Viviparous Female, Fall Migrant —I'late 8, fig. 9. Plate 6, figs. 

 13, 14. 



Specimens taken at Fort Collins, Col., October 13, 1906, from plum, peach 

 and cherry trees. 



Head, entire thorax above, mesothorax below, distal portions of all femora 

 and tibiag, the tarsi, antennae and a large spot on the pleurum beneath the 

 insertion of the fore wing black or blackish; abdomen pale yellow or green- 

 ish yellow, with a large dusky brown patch upon the dorsum of segments 4, 

 5 and G, and often extending upon segments 3 and 7; spots of a similar color 

 upon the lateral dorsal margins of segments 2, 3 and 4 ; the metasternum, 

 genital plates, middle and hind coxae, cornicles, style, distal half of beak, and 

 sometimes two or three spots on either side of venter, dusky brown; eyes 

 very dark red; stigma; of wing slightly dusky; third joint of the antennae 

 lighter than other parts; lateral tubercles of thorax wanting, or appearing 

 as very small points; length of cauda .14 mm.; cornicles distinctly constricted 

 in basal half, giving them the form of a ball club. Joint 3 of the antenna with 

 10 to 12 circular sensoria in a single row. No others except the regular ones 

 on joints 5 and 6 ; see Plate 6, fig. 14. 



MEASUREMENTS IN MILLIMETERS OF FOUR NORMAL SPECIMENS 



MEASUREMENTS OF ANTENN.AL JOINTS IN MILLIMETERS 



Oviparous Female— Plate 8, fig. 10 and Plate 6, figs. 16 and 17. 



Specimens from peach and native plum. Fort Collins, Col., November 2, 

 1906. 



The young, when first born, are green with red eyes, but soon change as 

 they grow to bright flesh or even salmon-colored apterous individuals, with 

 distal half of antennae, tarsi and extreme tips of cornicles black or dusky. 

 The cornicles of these apterous females, when resting quietly, usually con- 

 verge strongly towards their tips, lying close to the sides of the body, and 

 each is bent distinctly outward near the distal end, where they are usually 

 a trifle thicker than near the proximal end. Fully grown examples are 



