528 



Pomona College Journal of Entomology 



WINGED VIVIPAROUS FEMALE (Figure 171 A) 

 Length of body 2.2 mm., widtli of mesothorax 0.6 mm., wing expansion 7.2 

 mm. 



Prerailing color — Shiny or dull black, some forms may appear very dark 

 brown. Head — Considerably narrower than prothorax, black or very black. Eyei 

 — Dark red. Antennae — (Figure 171 C). On inconspicuous frontal tubercles, reach- 

 ing nearly to the middle of the abdomen, sparsely haired, articles I, II, color of 

 the body. III amber with dusky middle, IV, V and VI light with apical halves 

 dusky, length of articles: I, 0.09 mm.; II, O.O6 mm.; Ill, 0.3 mm.; IV, 0.26 mm.; 

 V, 0.25 mm.; VI, 0.39 nmi. (spur 0.25 mm.), total 1.35 mm.; five large sensoria 

 on III. Rostrum — Reaching to second coxa?, lemon yellow with black base and tip. 

 Prothorax — Black, with distinct lateral tubercles. Mesothorax and Metathorax — 

 Black. Abdomen — Smooth, dark olive green or nearly black with darker lateral 



Figure 171. Aphis medicaginis 

 A, winged viviparous female; H, ai>tor(ius viviparous female; C, antenna of 

 winged female; D, cornicle of winged female; E, pyjridiuiii of winged female, dorsal 

 aspect; F, cornicle of apterous female; G, antenna of apterous female; II, pygidium 

 of apterous female, ventral aspect. 



