224 POMONA COLLEGE JOURNAL OF ENTOMOLOGY 



whitish color in the living forms. This does not show in the cut. Slightly 

 hairy. Coniiclcs (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. Siib-costal, straight. 

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

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

 Tliird 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. Snb-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 Vivip-xrous Fem.vle (Fig. 96 I) — Length 3 mm., width l]4 

 mm. Color, dark brown to almost black. Differs 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 Vivip,\rous 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. H. 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 antenna 

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

 place it in the genus xAphis. Ashmead had named this species citrifolii and 

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

 cuciimeris, while Weed again named it forbesi. 



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

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

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

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

 Iconis) ; 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 hcrbaceum) ; Pear ( Pyrus comminis) ; European 

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

 ChaitoplKwii.s popiiliciila Thos 



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

 populicola are correct: Length 1.3 to 2 nnn., width 1 mm., wing expansion 

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



