LEPIDOPTERA. lYJ 



Walshii appearing from a proportion of chrysalids 

 which have passed through the preceding winter, and 

 which are opened by the pupse before the 15th of 

 April ; the remainder, which are opened by or before 

 the last of May or first of June, give out only the 

 second form, the Telamonides. These two varieties, 

 Walshii and Telamonides, lay eggs which pass through 

 the usual caterpillar and chrysalis stages and are 

 hatched after the first of June, but instead of coming 

 out as either Walshii or Telamonides, they are the dis- 

 tinct variety Marcellus. How purely this is a matter 

 of the seasons is shown by the following additional 

 facts. Of all the eggs laid by Walshii or by Walshii 

 and Telamonides before the last of April, there are 

 ten per cent which remain for some cause or other 

 undeveloped and pass the summer and winter as chrys- 

 alids. Of all the eggs laid by Telamonides or Walshii 

 in May, thirty-five per cent pass over to the next 

 spring. About the ist of June Walshii dies out. Of 

 all the eggs laid by either of the two forms which are 

 still surviving, Telamonides and Marcellus, in June, 

 fifty to sixty per cent are retarded and pass over the 

 winter. Before the end of June Telamonides dies 

 out, leaving only Marcellus surviving. 



Of all the eggs laid by this form in July, about 

 seventy per cent are retarded in development and 

 pass the winter as chrysalids. Marcellus may have 

 several successive broods, but the eggs of each brood 

 either pass over the winter or develop the same season 

 in from twenty-seven to thirty-eight days into perfect 

 butterflies. Thus in the spring we have a grand mix- 

 ture of the chrysalids of the three forms Walshii, 



