36 
A FEW INSECT ENEMIES OF THE ORCHARD. 
scales and young lice upon bark greatly magnified, and figure 
III. shows the scales on a pear, where they are represented of 
natural size. 
PUTNAM'S SCALE {Aspidiotus ancylus). 
This scale resembles the preceding very closely, but can 
usually be told from it by its darker color and the brighter or 
deeper rust-colored spots on the center of the scales. These two 
scales can onl^^ be distinguished with certainty by the use of 
Figure IV.— a, Immature Sa.'i Jose scale louse removed from 
the scale and greatly enlarged; b, its auteuua, or feeler, still 
more enlarged; c, gravid female, showing young within her body; 
d, outline of the anal plate, greatly enlarged. (Copied from bul- 
letin of United States Department of Agriculture, Division of 
Entomology.) 
a compound microscope in the hands of a specialist. It is im- 
portant, therefore, if either of these scales are suspected, that 
samples be forwarded at once to the experiment station for de- 
termination. So far as I can learn, Putnam’s scale has never 
been a very serious pest in any part of the United States, but 
there is always a possibility that an insect that has formerly 
attracted little attention may suddenly become very abundant 
and injurious when introduced into a new locality. This has 
b(‘en known to be present in a few places in Colorado for sev- 
eral years. I know of one small plum orchaid in Canon City 
