^40 



Pomona College Journal of Entomoloqy 



APTEROrS VIVIPAROl'S KKMALE (FigUrc 235 B) 



I,i-iij;tli ol liody 1.5 iiini., width of ahdouun '2.25 inin. A lar;;<r form than 

 thi- winged female witli more robust body. Body — Smooth, even shiny, covered 

 witli fine soft hairs, often ))ruinose, esjiecially if found near tlie surface of tlie 

 soil — in some cases densely covered with fine white (lowder, widest at middle and 

 tapering towards botli ends. Pri'i'tiiliii;; color — From a yellowish white, to flesh, 

 rose, or grayish or even silvery due to the covering. The forms taken from dee|) 

 under ground are very light and almost colorless and always without tlie pruinose 

 substance. Head — Gray or dusky, witli broad straight front and little or no signs 

 of .■intennal tuberi'les. nearly (]uadr;ingular in shape, wider than long, with narrow 



Figure 237. Fullawaya sal'ci-radicis Essig 

 On root of willow. SluiwiiiK adult apterous \ivii)arous females and a lar.tie horny 

 larva of the red syrpliid lly, which is the only natural enemy found preying on 

 this aphid. 



lighter band across the base. Eije.i — Dark red, rather large, with tubercle. 

 Antennae — (Figure 236, 1 and 2). Not half as long as the body, usually reach- 

 ing to the middle of the second abdominal segment, hairy, the transition from the 

 article VI to the spur very gradual; articles I and II dark gray, concolorous 

 with head, III yellow with apical one-half amber, tip of segment distinctly con- 

 stricted from last sensoria to the tip, IV. V^ and VI dusky amber with slightly 

 darker ti])s. Lengths of the articles: I, 0.07 mm.; II, O.l.S mm.; Ill, 0A5 mm.; 

 IV, 0.2!) mm.; V. 0..'iO mm.; VI, 0. H) mm. (sjmr 0.2.Q mm.) ; total 1.73 mm. Thus 

 it will be seen that I is sliorter th.in II, while in the winged form tliey were sub- 

 eipi.al ; III is longer tli.in IV or V hut not so long as both together, neitlier is it 



