Notes on Insect Bionomics. 367 



From this table it is apparent that the silken cocoon loses a 

 very small amount, about 4 per cent., of its weight in the first day 

 after its completion, and then loses no further weight; that the 

 pupa loses weight slightly but persistently and steadily from day 

 to day throughout its entire duration, the total loss amounting to 

 about 14 per cent. ; and that the pupae of three other lepidopterous 

 insects, namely, the tent caterpillar {Clisiocampa sp.), checker- 

 spot butterfly {Melitaea sp.) , and mourning-cloak butterfly (Eiiva- 

 nessa antiopa) also steadily lose weight from day to day, this loss 

 being very considerable in two of these species, viz., about 35 per 

 cent, in the case of one and 65 per cent, in the case of the other. 



