﻿336 POMONA COLLEGE JOURNAL OF ENTOMOLOGY 



mm. Length of secondary 1.2 mm., width 0.4 mm. Style — Long and cyUnd- 

 rical — about one-third the length of the cornicles. 



Apterous Viviparous Female. (Fig. 124 B). Length — Of average 2 mm., 

 width of average 1 mm. This form is more robust than the winged specimens 

 ;md varies from a greenish-brown to a slate color. In many specimens there 

 are enough small waxy particles upon the bodies to give them a gray 

 appearance. It differs from the winged form in the following: Article I 

 ;ind II of antennje dark, III and IV lemon yellow, ^* lemon yellow with dark- 

 tip, \"I with light base and remainder dark. Comparative lengths of articles 

 same as in the winged form. Color of legs same as in winged form, except 

 that the duskv portions are not so extensive on the tips of the femurs and 

 tibi;e. Rostrum — Lemon-yellow with a dark spot just in front of the tip. 

 reaches just beyond the mesothoracic coxk. .-ibdoiiien — \'ery rounded and 

 showing no dorsal segmentation, covered slightly with small, white, waxy 

 particles. Cornicles — Cylindrical, slightly enlarged at mouth. Cauda — Ex- 

 tended. .Style — Long and slender, more than half as long as the cornicles. 



Xxniphs of Apterous I'ii-iparous Females — Greatly resemble the females, 

 but are usually covered with a greater amount dt the fine, white, powdery, wax. 



Host Plants — English Ivy, Wirevine. 



Habitat. — First located on the English Iv)- on the I'omona College 

 Campus at Claremont, Cal. Since then it has l^een found to exist in all parts 

 of Southern California. 



Control. — This plant louse is held in perfect check by small Braconids 

 of the subfamily Aphidiinre, which are alxmdant wherever the louse exists. 



Nectarophora pisi (Kalt.) The Pea Aphid. 

 ll'ingcd ri7iparons Female (Fig. 125 .\). Length, 3 mm., width, 1 mm., 

 wing expansion 11 mm. Prevailing color, green. Head — Slightly narrower 

 than the prothorax, twice as wide as long. Compound eyes, red, with terete 

 tubercles just behind the outer margin. Antennae (Fig. 125 C) arise from 

 frontal tubercles, not approximate, gibbous, as is also the first article. The 

 color is darker than the body, being brown ; longer than the body, 6-articled, 

 the lengths of the respective articles being as follows: I 0.1 mm., II 0.1 mm., 

 Ill 0.9 mm.. l\' 1 mm., \" 0.6 mm., \'l 1.3 mm. The distribution of the 

 sensoria is as follows: I and II none. III very many large scattered the whole 

 length, I\' none, \' one large circular near the distal end, VI several marginal 

 m the nail-like process. All articles are slightly hairy. Prothorax — Without 

 lateral tubercles. Rostrum — Reaches to the mesothoracic coxae. Abdomen — 

 \"ery large, but well proportioned, segmented, area near middle spotted with 

 red blotches. Cornicles (Fig. 125 D) cylindrical, long, dark near the distal 

 ends. Legs — Long and slender, enabling the insect to travel rapidly. Distal 

 ends of fenuir, tibia dark as are also the tarsi. All hairy. Wings — Hyaline. 

 Primary. — Length, 5 mm., width, 1.7 mm. Costal — Nearly straight to the 

 wing-tip. Sub-Costal — Straight, and well defined .Stigma — Dark, long, nar- 

 row, and nearly rectangular in shape. Reaches nearly to tip of wing. Stignial 



