Pomona College Joukn.\l op Entomology 



791 



distinct fniiital tuberules, black. Eyes — Very dark red. Antennae — (Figure 

 251, 1-4 and 8). More tlian half a.s lonjr a.s the body, reaching to the bases 

 of the cornifli's, .slender, with very few hairs, iiiihrieated, nearly blaek e.veept- 

 ing ha.se of article III and at the articulations. Lengths of articles: I, 0.09 

 mm.; II, 0.05 mm.; Ill, 0.45 mm.; IV, 0.26 mm.; V, 0.17 iinii.; VI, 0.56 mm., 

 (si)iir (ir filament 0.47 nun.) ; total, IMH mm. Article I is longer and larger 



Figure 251. Aphis maidis Fitcli 

 winged viviparous female: B. apterous viviparous female; 1-4, antennal articles of 

 winged female (1, third article: 2, fourth article: 3 and 4, fifth articles); S, cornicle 

 of winged female: 6, cornicle of apterous female; 7, antenna of apterous female; 

 8, antenna of winged female. 



than II, III is longer than IV or V, hut not as long as the spur of VI, IV 

 alway.s a little longer than V, and twice as long as the base of VI. It is 

 noticeable that in most of the descriptions of the middle-western forms the 

 filament of VI is shorter than III, while in practically every specimen col- 

 lected here it is much longer than 111 and in a few cases almost a third longer. 



