Pomona College Journal of Entomology 



591 



Prevailing color — Black or dark olive green. Head — Well rounded in the 

 front, nearly as long as wide, black. Eyes — Dark red or brown. Antennae (Fig. 

 192, f) — Not arising from frontal tubercles, but direct from tiie head, much 

 shorter than the body — not reaching to the bases of the cornicles ; articles I and 

 II dark. Ill and IV light lemon yellow, V light lemon yellow with a dark tip, VI 



E- O. ESSIO . 



Figure 192. Aphis gossypii 



dusky throughout; lengths of the articles: I, 0.08 mm., II, O.O6 mm.; Ill, 0.32 mm.; 

 IV, 0.25 mm.; V, 0.21 mm.; VI, 0.35 mm. (spur 0.25 mm.); total 1.27 mm.; all 

 articles sparsely haired : sensoria on articles V and VI normal. Rostrum — Reach- 

 ing just beyond the third coxse, lemon yellow with dark base and tip. Prothorax — 

 Very short, with distinct lateral tubercle. Meso-and metathorax — Narrow trans- 

 versely. Abdomen — Smooth, dark green with irregular lighter markings on the 

 dorsum and with small marginal tubercles on the sides, ventral surface dull green. 



Anal plate (Fig , d ,dorsal, and e, ventral) — Dusky, hairy. Cornicles (Fig. 



192, i) — Cylindrical, widest at base and gradually tapering to tip, imbricated, 

 black, length 0.27 mm. Legs — Normal, coxae dark, femora light yellow, tibiae 



