APHIDID/E OF SOUTHERN CALIFORNIA V 



BY E. O. ESSIG 



Aphis rudbeckiae Fitch 

 Winged Viviparous Female. (Fig. 138). Length, 2.25 mm., width, 1 mm., 

 wing expansion, 9.5 mm. Prevailing color — Wine red with margins of abdo- 

 men, thorax and head darker. Head — Narrower than thorax, dark reddish- 

 brown, shining. Eyes — Dark with typical terete tubercles. Antennae (Fig. 140 

 A) arise from slight frontal tubercles, longer than the body, tapering, dark 

 in color, slightly hair> — 6-articled (7 according to older classification) ; I 

 0.188 mm., II 0.094 mm.. Ill 1.05 mm., IV 0.76 mm., V 0.68 mm., VI 1.218 



Figure 138. Aphis rudbeckiae, winged viviparous female. 



mm, (VI 0.188 mm. and VII 1.03 mm.). The sensoria are of various shapes, 

 round and scattered, abundantly on article III, one on article V, and several 

 in the nail-like process on article VI. Prothorax — Same color as head, 

 without lateral tubercle, narrower than mesothorax. Rostrum — Reaches to 

 first abdominal segment, dark at tip, stout. Abdomen — Dark red at margins, 

 shiny, round and wider than thorax. Cornicles — Black, cylindrical, 0.85 mm. 

 in length. Wide at mouth end. Legs — Long and slender, slightly hairy, dark 

 at joints. (At the union of the femur and tibia, at the distal and of tibia, 

 all of the tarsi and claws.) lVi)igs — Hyaline, typical aphis form. (See cut.) 

 Primary — Length 4 mm., width, 1.5 mm. Costal and sub-costal veins wide 



