336 POMONA COLLEGE JOURNAL OF ENTOMOLOGY 



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

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



Apterous rkiparoits female. (Fig. 124 1',). Length — Of average 2 mm., 

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

 i'ud 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 

 and II of antennjE dark, III and IV lemon yellow, \' lemon yellow with dark 

 tip, \'I with light base and remainder (kirk. Comparative lengths of articles 

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

 that the cUisk\' portions are not so extensive on the tips of the femurs and 

 tibis. Rostrum — Lemon-yellow with a dark spot just in front uf tlie tip, 

 reaches just l^eyond the mesothoracic coxas. Abdomen — \'ery rounded and 

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

 particles. Cornicles — Cylindrical, slightly enlarged at mouth, i'auila — Ex- 

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



Nymphs of Apterous Tkiparous Feiiuiles — Greatly resemble the females, 

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



Host Plants — English Ivy, Wirevine. 



Habitat. — First located on the English Ivy on the Pomona College 

 Campus at Clareniont, Cal. Since then it has been found to exist in all parts 

 of Southern California. 



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

 of the subfamih- Aphidiinje. which are abundant wherever the louse exists. 



Nectarophoia put (Kalt.) The Pea Aphid. 



Jl'ingid I iziparous J-emale (Fig. 125 A). Length, 3 mm., width, 1 mm., 

 wing expansion 11 mm. Prd'ailing 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 

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

 color is darker than the body, being brown ; longer than the body. ()-articled, 

 the lengths of the respective articles being as follows: I 0.1 mm., 11 0.1 mm.. 

 Ill 0.9 mm.. 1\' 1 mm., \' 0.() mm., \"1 1.3 mm. The distriljution of the 

 .•-ensoria is as follows; I and II none. 111 ver}' many large scattered the whole 

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

 m the nail-like ])rocess. .\11 articles are slightly hair)-. Prothora.v — Withnut 

 lateral tubercles. Rostrum — Reaches to the mesothoracic cox;e. .Ibdomen — 

 \'ery large, but well proijortioned, segmented, area near middle s])otted with 

 red bliiiches. Cornicles ( Fi.g. 125 D) cylindrical, long, dark near tlu' distal 

 ends. Legs — Long and slender, enabling the insect in travel r;i|iidly. Distal 

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

 Primary. — Length, 5 mm., width. 1.7 mm. C'ostal — Nearly straight tn the 

 wing-ti]). Suh-Costal — Straight, .ind well defined Stigiiiu — Dark, long, nar- 

 row, and nearh' rectangular in shape. I^eaches nearly to tip of wing. Stigmal 



