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



111' 



Figure 41. — Aster olecanium medium: A, genital and anal area, X 345. A. miliaris- 

 miliaris: B, section of margin; C, outline, X 165; D, dorsal tube, X 900; E f 

 antenna, X 900 ; F, tubular duct ; G, genital and anal area, X 650. A. miliaris 

 robustum: H, spiracles and section of margin, X 330. A. mimicum: I, outline,. 

 X 165 ; J, antenna ; K, spiracle ; L, section of margin ; M, marginal 8-shaped 

 pore ; N, dorsal 8-shaped pore. 



