360 JOURNAL OF ECONOMIC KNTOMOLOGY [Vol. 1 



A larger specimen that possibly had shed once measured .80 mm., and the 

 antenna .45 mm.; joints of antenna 6 on each side; others, as shown above, 

 were mostly 5-jointed on each side. The' .80 mm. louse began to show the 

 carneous color, which usually appears after the first molt. Cornicles short, 

 keg-shaped, being slightly bulged in the middle; length .03 mm.; antenna hair- 

 less; 3d joint about equal to 4 and 5 combined; body smooth, free from hairs 

 and without distinct markings. < 



Adult Stem-Mother— Plate 8, fig. 5. 



Specimens taken in peach blossoms. Fort Collins, Col., March 30, 1907. 



Length of body varying little from 1.70 mm., width 1 mm.; length of an- 

 tenna .80 mm.; cornicles .14 mm., cylindrical or slightly clavate; anteunal 

 joints: III, .33; IV, .16; V, .13; VI, .17 mm.; 5th joint barely larger than 

 base of 6th; no indication of joint being divided into two; one sensorium 

 near distal end of 4th joint, and the usual cluster on the 5th; color pale 

 green, more or less washed and mottled with light salmon. In many cases 

 the red color predominates, and in others the green. Cornicles rather strongly 

 converging, slender, slightly larger at base, black at extreme tips; legs very 

 pale, with distal ends of tibiae and tarsi black; antennge very pale, a little 

 dusky towards distal ends; no tboracic or abdominal tubercles, antennge on 

 moderate though well developed tubercles; cauda slightly curved upwards and 

 with velvety appearance, duo to the surface being densely set with minute 

 points; beak l)arely attaining hind coxae, and black at extreme tip. 



Apterous Viviparous Female, Second Genei-ation — Plate 8, fig. 7. 



Specimens taken from peach leaves. Fort Collins, Col., September 16, 1908. 



General color a very pale yellowish green without black markings, even 

 upon the legs; eyes dark red. These females usually exhibit one or more 

 small red dots on the abdomen, due to the colors of the eyes of the eml)ryos. 

 General shape of the louse rather long and tapering posterioiHy; surface of 

 the body finely reticulated; length of body 1.86 and greatest width 1 mm.; 

 antennae 2.09 mm.; joints: III, .43; IV, .31; V, .57; VI, .10; VII, .88 mm.; 

 cornicles .60 mm.; hind tibiae 1 mm.; antennae upon rather strong frontal 

 tubercles; first joint of the antennae with a prominent angle or gibbous en- 

 largement; prothorax without lateral tubercles; a few scattering hairs upon 

 the body, most of which are capitate. The cornicles are slender, nearly uni- 

 form in diameter thi-oughout, slightly swollen on tbe inner margin near the 

 distal CTid, at which point they curve slightly outward. 



The suinnier apterous females upon various vegetable and green- 

 house plants differ from the spring form by being pale yellovi^ish in 

 color and having the median and two dorsal longitudinal green stripes 

 upon the abdomen obscure or wanting. 



Spring Migrant— Plate II, fig. 8; Plate 6, figs. 11, 12. 



The spring migrant differs from the fall migrant described below by being 

 more green in ground color, having tlie dark markings blacker and more ex- 

 tensive, the Cauda and cornicles being black or blackish, and, most important 

 of all, the cornicles are cylindrical. 



