98 SHARP EYES 



oval cavity, which they form by persistent squirming, 

 are transformed to chrysalids, which will average about 

 an inch and a quarter in length. Here they remain 

 through the winter, and in the last of June and begin- 

 ning of July, the moth being then almost ready to 

 emerge, they work their way to the surface of the 

 ground, and this explains my queer pantomime under 

 the oak-trees. The ground beneath almost any oak 

 which has been known to be infested with the cater- 

 pillars is certain to contain a number of the chrysalids, 

 and if such a spot in the woods be carefully cleared of 

 leaves with a rake in early June, the search, during the 

 following weeks until the middle of July, is quite cer- 

 tain to be rewarded. 



There are other exactly similar chrysalids from the 

 same group (Dryocampa) which you are quite as likely 

 to find that of the "rosy moth," perhaps, whose cater- 

 pillars live upon the maple. 



