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



Figure 27. — Aster olecanium gemmae: A, outline, X 100 ; B, section of margin, X 

 900 ; G, genital and anal area, X 900 ; D, antenna ; E, disk pore ; F, quinque- 

 locular pore ; G, dark-rimmed 8-shaped pore ; H, minute dorsal 8-shaped pore ; 

 /, submarginal 8-shaped pore; J, spiracle. A. gilvum: K, outline, X 165; L, 

 genital and anal area, X 330 ; M , section of margin, X 900 ; N, spiracle, X 900 ; 

 O, antenna ; P, trilocular pore ; Q, disk pore ; R, dark-rimmed 8-shaped pore ; 

 8, minute dorsal 8-shaped pore ; T, submarginal 8-shaped pore. 



