Explanation of Plate 5. 



Fig. i. Cross section of male scale of Chionaspis salicis. 



Fig. 2. Leg of larva of Chionaspis salicis. 



Fig. 3. Pygidium of Chionaspis furfur a. 



Fig. 4. Diagramatic representation of a female Chionaspis to show how 



the thirteen segments of the body may be accounted for. 

 Fig. 5. Larva of Chionaspis americana soon after it has come to rest : 



showing the way it begins the formation of the scale. 

 Fig. 6. Antenna of larva of Chionaspis salicis. 

 Fig. 7. Side view of female scale of Chionaspis salicis. 

 Fig. 8. Body of the female of Chionaspis salicis. 



