ItnS ENTOMOLOGICAL SOCIETY. 21 



The White-marked Tussock Moth, Ilemerocampa Uucostigma S. & A., has 

 not been so plentiful for several years; it took complete possession of the city. In 

 some of the down-town districts the shade trees, especially the horse chestnuts, were 

 almost completely defoliated. In certain parts of the suburbs the caterpillars were 

 numerous, where in former seasons only isolated wanderers were to he seen. In 

 Parkdale, practically all the streets were invaded by them and they even found 

 their way into the houses. 



" They were the terror of each favorite walk, 

 The endless theme of all the village talk." 



On the elms of the city the caterpillars of Acronycta americana were plentiful 

 enough to do considerable damage. This common species is easily identified by its 

 dense covering of yellow hairs and the long, black pencils of bristles regularly 

 placed on the body. 



As a general rule, the " woolly bear " caterpillar, larva of the Tiger Moth, 

 Diacrisia virginica Fab., is noticed only in the fall, when it is hurrying about in 

 an eager quest for food before going into winter quarters. This year, however, 

 these reddish-brown larvie were plentiful in many gardens throughout the entire 

 summer. While they seemed to prefer Virginia creeper they were often seen feed- 

 ing indiscriminately on grape vines, honeysuckles, lettuce and other plants. 



The Isabella Tiger Moth, Isia isahella S. & A., the larva of which differs from 

 the preceeding in being black at each end, was seen only in normal numbers 

 although it is generally the more abundant species of the two. 



The ^Vhite Cabbage Butterfly, Pontia rapce Linn., has been a much worse pest 

 tlian usual this summer. Although cabbage patches were plentiful owing to the 

 general cultivation of vacant land, yet every plant observed seemed always to be an 

 object of interest to a swarm of butterflies. 



In connection with the surprisingly large number of these butterflies seen in 

 this district during August, the following note, kindly written at my request by 

 Mr. Andrews of the city, is very interesting: 



"AprAEENT Migration of P, rap.t: (Cabbage Butterfly). 



"On Sunday morning (about 11.30), Aug. 12th, my attention was attracted 

 by a number of these butterflies coming inland off Lake Ontario. 



" Sitting down to watch where they came from, one can imagine my surprise 

 at seeing a huge swarm of these insects flying low over the Lake towards Kew 

 Beach — there were positively thousands of them. 



" For three or four days after their arrival they were a perfect pest to people 

 sitting or walking on the beach — they were everywhere and flying with them 

 were the largest number of dragonflies I have ever seen. 



" I don't hesitate to add that this swarm of P. rapce came over the Lake, as 

 everything regarding the weather was in their favour. The wind at the time of 

 their arrival was gentle and blew south-south-west, and they seemed to be flying 

 with it." 



Although the Monarch Butterfly, AnosM plexippiis Linn., was very numerous 

 last year, it has been even more plentiful this season. During August ample 

 evidence was furnished concerning the congregating habits of these insects. Flocks 

 of them were seen in High Park, Mimico, and other places, even including the 



