KEY TO ADULT FEMALE NORTH AMERICAN MALAGOSOMA 



(The genitalic characters are the most reliable.) 



1. Lines on forewings white or yellowish-white, nearly straight, 

 almost always without indentations along veins (figs. 207, 208, 

 315, 318, and 320); genital plate heavily sclerotized with 

 ostium located near the edge (fig. 90); distribution — east of 

 the central Great Plains and south from southern Canada to 



the Gulf of Mexico (fig. 2) americanum, p. 1 1 1 



Lines on forewings light or dark, usually bowed outward, often 

 with indentations along veins as in figure 281; genital plate 

 unsclerotized or partially sclerotized or fully sclerotized, but 

 if sclerotized the ostium is near the center (figs. 83, 95, and 

 102); distribution — all of North America 2 



2(1). Epiphysis usually shaped as in figure 76, and usually longer 

 than the second segment of foretarsus, rarely smaller or ab- 

 sent; color yellow-brown to orange-brown, forewings crossed 

 by soft brown lines without a distinct fighter border; lines 

 almost always without indentations along veins (females in 

 figs. 119-139); genital plate sclerotized and with ostium in 

 center (fig. 83); ovipositor lobes as in figures 81 and 82 with 



no distinct dorsal lobe disstria, p. 84 



Epiphysis absent or shorter than second segment of foretarsus; 

 color usually not as above ; lines on forewings with or without 

 indentations along veins; genital plate variably sclerotized 

 with ostium in center; ovipositor lobes (figs. 84—104) not as 

 above 3 



3(2). Color medium chocolate-brown, dusted with whitish-yellow 

 scales which are quite apparent on most specimens; lines on 

 forewings dark (on a few rare specimens the lines may be 

 light as in figs. 157 and 160) and without indentations along 

 veins; median area usually somewhat darker than inner and 

 outer areas (females in figs. 140-160); genital plate usually 

 unsclerotized; ovipositor lobes as in figures 86 and 87; dis- 

 tribution — California, Oregon, Washington, and Baja 



California '* 



73 



