WITH FURTHER HISTORIES. 171 



those which disclose their inmates earliest produc- 

 ing Walshii, the others Telamonides ; while all 

 buttei-flies produced from eggs of the same season, 

 and there are several successive broods, belong 

 to Marcellus. Thus, 

 besides the true 

 seasonal d i m o r - 

 phism which distin- 

 guishes the butter- 

 flies produced from 

 eggs of the same 

 season from those 

 derived from eggs of 

 the previous season, 

 we have a second- 

 ary seasonal dimor- 

 phism, as it may well 

 be called, separating 

 the earlier from the 

 later produce of win- 

 tering chrysalids. 

 Mr. Edwards has 



Shown that a por- FIG. 147.-Iphiclides Ajax, form Marcel- 

 . . , -, his, nat. size. 



tion of every brood 



of chrysalids, instead of disclosing the imago 

 at the end of the ordinary time, retain it, occa- 

 sionally until the appearance of a subsequent 

 brood, but usually until the next spring. The 

 spring brood, for which we are obliged to use the 



