1915] Biology of Juniper Berry Insects 179 
Method of Work.—Drawings and measurements were made 
from larve killed in hot water and, where possible, from parts 
mounted on slides. Trachea were studied by putting a few 
drops of caustic potash or chloroform on the larva and then 
placing a cover glass over it. 
Acknowledgment.—I wish to thank Professors Crosby and 
Johannsen for their many kind suggestions throughout the work 
and especially Professor Crosby, at whose suggestion the work 
was undertaken, and whose aid was invaluable throughout the 
study. 
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