138 SEASONAL CHANGES AND HISTORIES. 



May, and the caterpillars begin to change to 

 chrysalids in the first half of June ; after passing 

 from ten to twelve days in this state, or about the 

 middle of June, the first brood of butterflies from 

 caterpillars of the same year makes its appear- 

 ance ; this brood continues on the wing until after 

 the middle of July, the eggs are apparently laid 



FIG. 127. A'glais Milberti, nat. size (Harris). 



very soon after the eclosion of the butterfly, and 

 the second brood appears at the very end of this 

 month, or early in August ; these must lay their 

 eggs at once, for the caterpillars are full grown by 

 the end of August, and appear as butterflies early 

 in September, before those of the previous brood 

 have disappeared ; these September butterflies 

 soon hibernate, and early in the following spring 

 deposit eggs, which, unlike their sisters of the 

 previous broods, they must carry unlaid for 

 many months. We have again in this insect an 

 illustration of the prodigality of nature, to which 



