THE PEA APHIS WITH RELATION TO FORAGE CROPS. 45 



It will be observed that only one record of a winged female was 

 noted, and this individual required a noticeably longer time to reach 

 maturity than did the wingless forms observed at the same time. 

 This has been our observation time and again, although no definite 

 records were kept. 



AGE AT WHICH FEMALES BEGIN REPRODUCING. 



In 1912 the age at which females began giving birth to young varied 

 from 6 to 35 days, with an average of 10.3 days, from 38 records 

 covering the months from May 15 to December. (Table V.) 



