600 Pomona College Journal of Entomology 



S.2 mm., width 1.2 mm. Posterior — Normal, length 1.8 mm., width 0.53 mm. 

 Style — (Figure 195 C). Ensiform or nearly conical, sickle-shaped, dusky, length 

 0.2 mm. 



APTEROUS VIVIPAROUS FEMALE (Figure 195 B) 

 Length of body 1.8 mm., greatest width of abdomen 0.95 mm. 



Prevailing color — Bright yellowish green, shiny throughout. Head — Nearly 

 as long as wide, with very prominent approximate and somewhat gibbous, frontal, 

 antennal tubercles. Eyes — Red. Antennae — (Figure 115). On prominent 

 tubercles, first article somewhat gibbous, reaching to base of the cornicles, articles 

 I, II, III and basal two-thirds of IV light yellow, remainder dusky, lengths of 

 articles: I, 0.09 mm.; II, 0.08 mm.; Ill, 0.43 mm.; IV, 0.34 mm.; V, 0.21 mm.; 

 VI, 0.53 mm. (spur 0.38 mm.). Rostrum — Reaching to second coxae, light with 

 dusky tip. Abdomen — Smooth, light green, anal plate dusky. Cornicles — Figure 

 195 Fl and F2). Slightly clavate, light green with apical two-thirds or but 

 one-fifth dark, reaching beyond tip of style, length 0.5 mm. Legs — Light green 

 throughout with dark tarsi. Style — (Figure 195 D). Conical, sickle-shaped, 

 length 0.2 mm., light green. 



This species is one of the most widely distributed and most variable of the 

 entire family. It presents a number of distinct forms, each of which has been 

 described as a separate and distinct species, causing much confusion in the literature 

 of the family Aphididae. Perhaps no one has worked it out more thoroughly than 

 has Prof. C. P. Gillette of the Colorado Agricultural Experiment Station. In the 

 Journal of Economic Entomology, Vol. I, p. 359-362, may be found his full 

 descriptions. He separately describes the following forms: Young Stem-Mother, 

 Adult Stem-Mother, Apterous Viviparous Female, Spring Migrant, Winged Vivip- 

 arous Female, Fall Migrant, Oviparous Female, and Male. Of these I have 

 described the Spring Migrant and the Apterous Viviparous Female, the forms 

 most common in this locality. For the full descriptions see his article. 



Hosts — I have obtained this species on citrus trees (Orange and Lemon), 

 Potatoes, Malva parviflora L., and Tomatoes. It has also been reported as feeding 

 upon the following plants: Amsinckia spectahilis F. & M., Brassica oleracea 

 (Cabbage, Cauliflower), Celestial pepper (Capsicum annum var abhreviatuiii 

 Fing.), Chrysanthemum indicum L., Cynoglossum sp., Carnation {Dianthus 

 caryophyllum L.), English Ivy (Hedera helix L.), Plum (Prunus domestica L.), 

 Peach (/'. persica B. & H.), Groundsel (Senecio vulgaris L.), Sonchus asper Vill.. 

 Sonchus oleraceus L., Nettle (Urtica urens L.), Prunus amygdalus amygdalus. 

 Cherry [P. cerasus L.), German Ivy, Prunus insititia, Malva rotundifolia. 



Locality — Taken by the writer in many parts of Southern California, at 

 Claremont, Santa Ana, Santa Paula and Pomona. Date of collection — April 14, 

 1911. Serial number 22. 



Note — I am indebted to Mr. ,1. T. Monell for the specific determination nf 

 this species. 



