264 MISC. PUBLICATION 42 4, U. S. DEPT. OF AGRICULTURE 



Figure 29— Aster olecanium gutta: A, outline, X 50; B, section of margin, X 650; 

 C, submarginal 8-shapecl pore : D, dark-rimmed 8-shaped pore ; E, minute dorsal 

 8-shaped pore; F, marginal 8-shaped pore. A. hakeae: G, outline, X 60; H, 

 genital and anal area, X 230; J, section of margin, X 650; J", antenna. A. 

 hemispJiaericum: K, dorsal tube; L, section of margin, X 460; M, submarginal 

 seta ; N, dark-rimmed 8-shaped pore near beak ; O, dark-rimmed 8-shaped pore 

 on abdomen. 



