22 
Psyche 
[March 
terial projecting beyond the end of the case proper, showed 
a range in length from 8 to 16 mm., with an average of 12.1 
mm.; measurements of the same cases, exclusive of the 
loose material, ranged from 7.5 to 10 mm. with an average 
of 8.8 mm. Fifty male cases ranged from 7.5 to 13.5 mm., 
with an average of 10.2 mm., inclusive of the loose material ; 
when measured without the loose material, these male cases 
ran from 6.5 to 8 mm., with an average length of 7.5 mm. 
When the larvae become full grown, they forsake the 
ground and low plants on which they have spent their en- 
tire lives up to this point, and climb up tree trunks, tele- 
graph poles, fence posts, stone walls, sides of dwellings, 
etc., to attach their cases for pupation. The height to 
which the larva ascends before attaching the case varies 
from a few inches to twenty feet, but few are attached 
above six feet. Although the larvae on the ground easily 
escape notice even in densely populated colonies because of 
