EXPLANATION OF PLATES. 



Plate XXXVIII. — Life Stages of Yponomeuta malinellus. 



1, 2, 3, and 4, egg clusters, natural size and enlarged; 5, 

 egg mass reversed showing hibernating larva; 6, larvae 

 enlarged; 7, apple leaf showing " mined " areas. 



Plate XXXIX. — Caterpillars of Yponomeuta malinellus. 



Characteristic positions on leaves and in webs, and range 

 of variability in color and markings. 



Plate 



XL. 



Life Stages of Yponomeuta padellus and malinellus. 



1, Pupse of padellus, and 2, of malinellus; 3 and 4, dorsal 

 views of dark and light-colored caterpillars; 5, caterpillar, 

 lateral view showing characteristic markings. 



Plate XLI. — Life Stages of Yponomeuta padellus and malinellus. 



1 a and c, cocoons of padellus on cherry and hawthorn; 1 b, 

 cocoons of malinellus on apple; 2 and 3, cocoons of mali- 

 nellus (enlarged) and position on infested seedling; A, mali- 

 nellus moths in resting positions; 5, moth enlarged. 



Plate XLII. — Some Yponomeuta Moths. 



1, Yponomeuta padellus L.; 2, intergrading form of padellus 

 and malinellus; 3, Y. malinellus Zell.; 4, 1'. evonymeUus 

 L.; 5, Y . muUipunctellus Clem.; 6, Y. mahalebellus Gn. 

 (Enlarged.) 



Plate XLIII. — Studies on Genitalia of Yponomeuta Moths. 



1, Yponomeuta padellus from hawthorn; 2, Y. padellus {mali- 

 nellus) from apple, Scotland; 3, Y. padellus from cherry, 

 Geneva, N. Y.; 4, Y. malinellus from apple, Japan; and 

 5, Y. malinellus, apple, Geneva; 6, }'. pohjstica (Sent by 

 Kuwana). 



Plate XLIV. — Feeding Habits of Yponomeuta malinellus on Apple. 



1, Spinning of web preparatory to feeding; 2, foliage con- 

 sumed; 3, character of feeding on apple leaves. 



Plate XLV. — Apple Seedlings Showing Defoliation and Webs of 



Yponomeuta malinellus. 



Plate XLVI. — Cherry Seedling Showing Webs of Yponomeuta padellus. 



