V 37 



about to pupate, the Black-headed Cabbage-worm crawls beneath 

 the leaves and other litter which lays upon the ground, and spins 

 a tough cocoon. 



There are two broods of these worms produced in one season ; 

 those of the first brood reach their full size by the middle of July, 

 and, after spinning their cocoons and assuming the chrysalis form, 

 are changed to moths in the latter part of the following month ; 

 while those of the second brood attain their full size in the latter 

 part of October, and are not changed to moths until the following 

 spring. These worms appear to be very social in their habits, and 

 mostly live on the under side of the leaves, sometimes beneath a 

 loose web. When jarred from their perch they hang suspended in 

 the air by a silken thread, as the Canker-worms and a few other 

 kinds of insects are known to do. 



I have never had the moths which were produced from these 

 worms determined, but suppose they were rightly referred by Prof. 

 Lintner, in his Entomological Contributions, No. III.* 



* Printed in the "Twenty- sixth Annual Eeport of the New York State Museum of Natural 

 History," page 164, where this species is placed in the genus Mesographe of Hubner. 



