1908 



ENTOMOLOGICAL SOCIETY. 



13 



were numbers of them not more than a quarter of an inch long. Could 

 the cold backward season have delayed the hatching of the eggs in some 

 cases ? 



Although I have since 1887 paid a good deal of attention to this insect 

 and each year have bred large numbers of them I had found but few para- 

 sitized. This season, however, in some parts of the City of Toronto it was 

 the exception to find a pupa free from parasites, the chief of these being 

 Pimpla inquisitor. As I have brought a number of specimens of the various 

 parasites bred from the Tussock Moth larvse which we can discuss at leisure, 

 I need make no further reference to them now. 



THE WHITE-MAEKED TUSSOCK MOTH. 

 By Paul Hahn, Toronto. 



Being asked by our President, Dr. Fletcher, to deliver a report regard- 

 ing the extermination in Toronto of the white-marked Tussock Moth (Hemero- 

 campa leucostigmo) , which has done so much damage to our shade trees, 

 allow me to state the following. (Fig. 1.) 



Fig. 1. Tussock Moth: a caterpillar; h and c chrysalids ; d and e male moths; / and 

 g wingless female moths; h eggs; i male cocoons; h female moths and egg masses on 

 cocoons. 



Two years ago noticing that this insect had done considerable harm 

 to our beautiful trees I called on the Mayor and the Park Commissioner of 

 our city. 



