48 



Emergence of Moths from Cocoons of Forest Tent-Caterpillar. 



Total males and females 1,466 



Number of cocoons parasitized 312 



Number cocoons unhatched 722 



These figures show that a little over 40 per ct. of the 2,500 

 cocoons failed to produce moths. Also that less than 47 per ct. 

 of those that hatched were females and that the greatest number 

 of moths escaped during the first five days of July. A little over 

 i2}4 per ct. were parasitized and more than 28 per ct. produced 

 neither moths nor parasites. 



The moths are active, restless insects. They fly only at dusk 

 and during the night. The females are ready to lay eggs soon 

 after leaving the cocoons, but probably live but a short time after 

 the eggs have been deposited. Some female moths kept in the 

 breeding cages laid their eggs within two days after escaping from 

 the cocoon and died before the end of the third day. 



Descriptions. — In general the moths resemble those of the 

 apple-tree tent-caterpillar except that the oblique lines across the 

 fore-wings are dark instead of light in color. The general color 

 of typical specimens is buff with a brownish tinge. An exami- 

 nation of a large number of moths showed a wide variation from 

 this even in the individuals that do not approach the varieties, 

 referred to on a subsequent page. Both wings and body are sub- 

 ject to decided shadings of either a yellow or brownish cast. A 

 male moth of average size spreads about one inch, but in the 



