Vol. xxvi] 



ENTOMOLOGICAL NEWS. 



155 



Taiu I. 



are more favorable than the laboratory conditions, but rather 

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

 the cecropia moth* that colder condition is correlated with 

 longer life, while wanner surroundings increase activity and 

 cause earlier exhaustion. Here. too. we will find by gbnanf 

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

 joyed the loogest combined period of pupal and adnh 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 afiPect 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 vict versa, so the balance 



•Joom. Ex^ ZooL, VoL XU, p. 18a loia. 



