208 



THE CANADIAN ENTOMOLOGIST. 



TABLE SHOWING THE RELATIVE OCCURRENCE OF THE VARIETIES OF 



C. SEX-GUTTATA. 



AN EXTRAORDINARY HABITATION FOR A MOTH. 



BY FREDERICK CLARK.SON, NEW YORK CITY. 



Among a number of cocoons of the family of Bombycidae collected 

 on Long Island this autumn, I have one of I', cccropia of light weight. 

 As the examination of this cocoon revealed conditions unknown to me, I 

 have thought it desirable to make a record for your invaluable journal. 

 The absence of the loose silk of a reddish hue which characterizes the 

 appearance of the new made cocoon, indicated that it was a manufacture 

 of the previous year. On opening it I found within a cocoon of O. mac- 

 riirnm, the parasite that commonly attacks the Polyphemus caterpillar. 

 The parasite had emerged from its cocoon, as evidenced by the usual lid 

 opening at one end, and had escaped into the outer air through the open 

 passage that exists in the cocoon of the moth. Within the cocoon of the 

 parasite I found a silken cocoon occupying the entire area and protruding 

 somewhat through the opening made by the former occupant. Within it 

 were the unrecognizable remains of a Lepidopterous larva, largely con- 

 sumed by what I believe to be the parasitic Dipteraof the genus Tachina. 



