LIST OF ILLUSTRATIONS 



European Elm Scale, Female Plate I 



1. Dead Females in Winter on Corlc Elm, Natural Size. 



2. Living Females in Summer. (X. 4). 



Hibernating Larvae Plate II 



1. On Elm Bud. (X. 16). 



2. Surrounding Dead Females. (X. 8). 



3. In Crack of Elm Bark. (X. 8). 



4. About Base of Twig. (X. 8). 



Larvae in Early Spring Plate III 



1. Crack in Elm Bark Full of Hibernating Larvae. (X. 4). 



2. Larvae and Male Cocoon. (X. 16). 



Hibernating Larvae Plate IV 



1 and 2.. Larvae Hibernating Beneath Dead Females. (X. 16). 



Cocoons of the Male Plate V 



1. Larvae Excreting Cocoon. (X. 16). 



2. Cocoon Finished, Anal Filaments of Male Protruding. (X. 16). 



3. Cocoons. (X. 4). 



Gossyparia spuria, Male. (X. 16) , Plate VI 



1. Cocoon With Protruding Wings and Anal Filaments. 



2 and 3. Wingless Males. 



4. Male. 



5. Cocoon. 



Pupae op Male. Drawing Plate VII 



1. First Pupa. 



2. Second Pupa at an Early Stage of Development. 



Details op Male. Drawings Plate VIII 



Gossyparia spuria, Female. (X. 16) Plate IX 



1. Just Before Impregnation. 



2. Excreting Semi-Cocoon. 



3. Fully Mature, Engorged With Eggs. 



Details op Female. Drawings Plate X 



Eggs and Larvae Plate XI 



1 and 2. Egg-Shells and Struggling Larvae Beneath Female. (X. 16). 



3. Egg-s and Hatching Larvae. (X. 40).' 



4. Larvae. (X. 16). 



Newly-Hatched Larvae. Drawings Plate XII 



The Larvae in Summer Plate XIII 



1. (X. 8) and 3. (X. 16). Along Mid-Rib on Under Surface of Leaf. 



2. (X. 16). Recently Hatched Larvae on the Upper Surface of Leaf. 



Suckers Plate XIV 



A Thicket of Sprouts Surrounding an English Elm. 



