LEPIDOPTERA . 
355 
of a large proportion of our common fruit and forest trees; 
but we have found it more frequently on wild cherry and 
ash than on others. The cocoons can be easily collected 
during the winter from these trees. This is the best way to 
obtain fresh specimens of the moths, which will emerge from 
the cocoons in the spring or early summer. The cocoon 
(Fig. 435) is interesting in structure. It is greatly elongated 
and is enclosed in a leaf, the 
petiole of which is securely fast¬ 
ened to the branch by a band 
of silk extending from the co¬ 
coon ; thus the leaf and enclosed 
cocoon hang upon the tree 
throughout the winter. At the 
upper end of the cocoon there 
is a conical valve like arrange¬ 
ment which allows the adult to 
emerge without the necessity 
of making a hole through the 
cocoon. This structure is char¬ 
acteristic of the cocoons of the 
moths of this and the following 
genus. 
The Angulifera Moth, Callo- 
samia angulifera (C. an-gu-lif'e- 
ra).—This is a somewhat rare in¬ 
sect which so closely resembles 
the Promethea Moth that by 
many it is considered a variety 
of it. Specimens of it are usu¬ 
ally a little larger than those of 
Q.promethea, and the transverse 
line and discal spots are more 
angular. The most important 
* Fig. 435.— Callosamia promethea, cococa 
differences, however, are pre¬ 
sented by the male, which quite closely resembles the female 
