﻿224 POMONA COLLEGE JOURNAL OF ENTOMOLOGY 



whitish color in the Hving forms. This does not show in the cut. SHghtly 

 hairy. Cornicles (Fig. 96 E) — Somewhat incrassate, dark, as long or longer 

 than the style. Legs — moderately long and hairy. Wings — hyaline with a 

 dark stigma. Primary — length, 3.5 mm., width 1.2 mm. Sub-costal, straight. 

 Stigma, dark, long, narrow, and nearly rectangular in shape. Stigmal arises 

 from center of stigma, and is curved gradually to the margin of the wing. 

 Third discoidal — straight, does not arise from the sub-costal, twice forked, the 

 first and second branches arising from the fork not far from the wing-margin. 

 Second discoidal — Curves slightly toward the body. First discoidal — also curves 

 toward the body. Secondary — Length, 1.5 mm., width, 0.5 mm. Sub-costal ex- 

 tends to wing tip. First and second discoidals nearly the same length and 

 nearly straight. Style — conical and hairy. 



(Vein terminology changed as follows — Cubitus to sub-costal; radius to 

 stigmal; obliques to discoidals.) 



Apterous Viviparous Femalb (Fig. 96 I) — Length 3 mm., width 1^4 

 mm. Color, dark brown to almost black. Diflfers from the winged form as fol- 

 lows : Body very much more robust and has appearance of some members of the 

 Genus Lachnus. Antennae (Fig. 96 C) without sensoria except in the nail- 

 like process. Cornicles (Fig. 96 F). 



Nymph of Apterous Viviparous Female (Fig. 96, D, G, H) — Resemble 

 greatly the adult, but are much lighter in color. The cut shows the principal 

 characteristics. This form was collected by C. li. Vary of Pomona. It was in- 

 festing orange trees of that locality very badly, and promised to do severe 

 damage. The general appearance was very much of a Lachnus and so I 

 marked it until it was studied out. The cottony covering and short antennae 

 led to this belief. The wing structure and general characteristics undoubtedly 

 place it in the genus Aphis. Ashmead had named this species citrifoUi and 

 citruUi, as found on orange and melon. Forbes had named the cucumber form, 

 cncumeris, while Weed again named it forbesi. 



Food plants — (After Theodor Pergande, in Insect Life, Vol. VII, p. 313) 

 Purslane (Portulaca oleracea) ; Shepherds-purse (Capsella bursa-pastoris) ; 

 Pepper-grass (Lepidium virginicum) ; Amaranthus sp. ; Dock (Rumex crispus 

 and other species) ; Burdock (Lappa major) ; Dandelion (Taraxacum dens- 

 leonis) ; Pigweed (Chenopodium album) ; Wormseed (Chenopodium anthel- 

 minthicum) ; Plantain (Plantago virginica) ; Chickweed (Stellaria media) ; 

 Morning Glory (Convolvulus sp.) ; Three-seeded mercury (Acalypha vir- 

 ginica) ; Button-weed (Diodia teres) ; Ground Ivy (Nepeta glechoma) ; Red 

 Clover (Trifolium pratense) ; Indian "Strawberry (Fragaria indica) ; Mallow 

 or Malva (Malva rotundifolia) ; Cultivated Strawberry (Fragaria) ; Dwarf 

 Bean (Phaseolus nanus) ; Spinach (Spinacia oleracea) ; Hop (Humulus lupu- 

 lus) ; Cotton (Gossypium herbaceum) ; Pear (Pyrus comminis) ; European 

 Dogwood (Cornus mas) ; Orange (Citrus aurantium and other varieties). 

 Chaitophorus populicola Thos 



In Vol. I, No. 4, December, the following measurements of Chaitophorns 

 populicola are correct: Length 1.5 to 2 mm., width 1 mm., wing expansion 

 7 mm. Primary wings, 3 mm.; secondary, 2 mm. 



