Vol. xxvi] 



ENTOMOLOGICAL NEWS. 



155 



TABLE i. 



are more favorable than the laboratory conditions, but rather 

 that the prolongation of life results from inertia. We find in 

 the cecropia moth* that colder condition is correlated with 

 longer life, while warmer surroundings increase activity and 

 cause earlier exhaustion. Here, too, we will find by glancing 

 at the table that some of those which pupated in March en- 

 joyed the longest combined period of pupal and adult life, 

 and each succeeding month, as the weather grew warmer, 

 brought a shorter duration until June brought the shortest 

 life of all. 



One might expect to find that the length of pupal life would 

 in some way affect the adult life, either that a long pupal life 

 would endow the individual with abundant vigor to carry it 

 through a longer adulthood, or else that the combined length 

 of life of pupa and adult was somehow allotted by nature and 

 that when the pupal stage was extended the adult life would 

 be correspondingly abbreviated, and vice versa, so the balance 



*Journ. Exp. Zool., Vol. XII, p. 189, 1912. 



