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I 
Figure 1 2. 
Apple Plant Louse: Twig showing eggs. (From photograph by the 
author.) 
Figure 29 A. 
A twig of soft maple showing the cottony scales covering it along one 
side, the under side of the limb. (Prom photograph by author.) 
Figure 29- B. 
Cottony Maple Scale: Female scales on leaf and twig with the cottony 
secretion protruding. (Riley, U. S. Dep. of Agr., Rep. 1884.) 
Figure 3 1 . 
Trunk of cottonw’ood tree showing the dark patches on the bark caused 
by the souring sap from the burrows of the Cottonwood Borer. (From photo- 
graph by the author.) 
Figure 32. 
Elm Leaf-cluster {Sclvizoneiira cnnericajia) : a, b, c, d, successive 
stages in the early development of the gall; e, the louse covered with cottony se- 
cretion at the base of the bud which is just beginning to curl. All natural size. 
(From photograph by the author.) 
Figure 33. 
Elm Leaf-cluster {Scliizoneiira americana): a, a, etc., a number of 
the clusters on an elm limb. Very much reduced. (Prom photograph by author.) 
Figure 34. 
Pine-leaf Scale {Chionaspis pimfoliae Fitch): A, the scales on leaves 
of silver spruce; B, scales on leaves of pine. (Prom photograph by the author.) 
Figure 35. 
Egg patches of plant lous« 5 /;. ) on Douglass Spruce. Each 
patch of eggs covered by a cottony secretion from the adult louse. Somewhat 
reduced. (h>om photograph by the author.) 
Figure 36. 
Injuries to small locusts trees by Tetraoesp fenioratus'^ a, a, etc., gashes 
cut in the stems by the jaws of the beetle; b, b, beetles at work. (From pho- 
tograph by the author.) 
Figure 49. 
A frame of honeycomb showing the cocoons and w’ebs of the w’orms that 
were feeding on old pollen. (From photograph by the author.) 
