2 BULLETIN 252, U. S. DEPARTMENT OF AGRICULTURE. 



DEFINITION OF TERMS. 



The following terms and definitions have been adopted for this 

 report. 



The term brood is used for any stage of any generation of the insect. 

 Thus, first-brood larva refers to a larva of the first generation; 

 spring-brood larva has reference to a larva of either the first or second 

 generation. 



Generation is used to include all of the stages of the insect, from 

 the egg to the adult stage. 



The life cycle of a generation herein recorded includes the time from 

 the deposition of the egg until the emergence of the moth. 



The complete life cycle includes the time from the deposition of the egg 

 of one generation to the deposition of the egg of the next generation. 



The term wintering larvae has reference to the larvae which winter 

 in the larval stage. It includes all larvae which do not transform 

 during the same season as hatched. 



The wintering larvae transform in the spring to pupae, known as 

 spring-brood pupae (spring pupae). These in turn transform to 

 spring-brood moths (spring moths). The spring pupae and spring 

 moths, although the first to appear in the calendar year, are not 

 designated as first-brood pupae and first-brood moths. The first- 

 brood pupae and the first-brood moths appear later in the season and 

 are the pupae and moths of the first generation. These may be con- 

 veniently designated summer pupae and summer moths. 



The terms used for Maine conditions are defined as follows : 

 Wintering larvse: Include overwintering larvae of the first and second 



broods. 

 Spring-brood pupse: Include the pupae from the overwintering larvae. 

 Spring-brood moths: Include the moths from the spring pupae. 

 The first generation includes: 



1. The first brood of eggs. 



2. The first brood of larvae, which includes 



(a) transforming larvae; 



(b) overwintering larvae. 



3. The first brood of pupae, or summer pupae. 



4. The first brood of moths, or summer moths. 

 The second generation {not complete in Maine) includes: 



1. The second brood of eggs. 



2. The second brood of larvae. None of these larvae transform 



until the following spring. 



