156 ENTOMOLOGICAL NEWS. [April, '15 



would be maintained. But a scrutiny of these data reveals 

 no evidence of such a result. In two cases the duration 

 of the stages was equal, in six cases the pupal duration was 

 greater than the adult duration, and in forty-one the adult 

 life was the greater. In some cases we find a long pupal 

 stage correlated with a long adult stage; in others we find a 

 shorter pupal stage correlated with a still longer adult stage, 

 etc., in almost every possible combination. The following 

 tables show the details of the duration of the pupal stage, the 

 adult stage and the combined durations. 



The duration of the pupal life of 54 individuals (see table 

 2) varied from 4 to 24 days, with an average of 15 days; 48 

 of these (table 3) passed through a normal adulthood of 10 

 to 55 days, with an average of 24 days, and the combined du- 

 ration for these 48 individuals (table 4) gives a total life of 

 15 to 71 days, or 39 on an average. The tables are for both 

 sexes ; no attempt was made to distinguish the sexes. 



