13 



entirely new localities, but that generally some probable reason could be given for their 

 appearance ; as, for instance, he remembered that many years ago two fresh specimens 

 of Euptoieta columbina had been found at St. Catharines, Ont., a place where they had 

 never before or since been observed, but that they had probably found their way there 

 among the large number of fruit and other trees imported from the States ; still, how- 

 ever, no such probable reason had been suggested for the appearance of the Cotton Worm 

 Moth in Ontario, in such frequent numbers and at so many different localities. The 

 matter was one of great interest. 



Mr. Fletcher said he hoped the members would continue their observations of this 

 insect, the larva of which, if found in Canada, would probably feed on some Malvaceous 

 plant. 



Prof. J. A. Cook stated that from the European larch he had taken about 250 cocoons 

 of Samia Columbia, and found among them one peculiar cocoon, very similar to that of 

 Columbia, which eventually produced a cecropia. 



Dr. Jewett thought it was probably a case of hybridism, as he himself had taken 

 hybrids of Gloveri and cecropia. 



Dr. Hagen had seen cocoons of cecropia so similar to those of Columbia that it would 

 be very hard to discriminate between them. 



Dr. Hagen also gave a very interesting account of an expedition to the Northwestern 

 Territories from which, in company with Prof. Henshaw, he had just returned. 



In the north of Washington Territory he found the forests and country generally in 

 splendid condition, and comparatively free from any insect pests. 



In other parts he had found the Yellow Pines most seriously affected by the attacks 

 of Pieris marsupia (/), large tracts of forests being entirely devastated — and large trees 

 being attacked as well as the younger ones. The Butterfly appeared there last year for 

 the first time — eggs were found on July 24th. The larva has the habit of dropping from 

 the trees by a thread, a peculiarity only noticeable in a very few of the Khopalocerag. 



A tree once attacked never seems to recover, and the only way to check the ravages of 

 the insect is to cut down those trees affected. 



In Montana the cattle feed out all the year round on the " bunch " grass, which is of 

 inestimable value to that country. A. curious fact to be noticed is that wherever timothy 

 and blue grass is introduced it seems to kill out the bunch grass, so that the advance of 

 civilization may in fact entirely alter the economy of the country. 



The grasses do not seem to be troubled as yet with any pests. 



The Colorado potato bug is merely known in certain localities. 



The fruit trees are troubled only by flies and ants, so that the territory is nearly free 

 from noxious pests. 



Prof. Henshaw said the expedition was one of great interest. 



A curious feature was the late hours at which insects appeared to feed, many of them 

 after sundown. 



Papalio machaon was found in great numbers. 



Carabidce were found in dry places, whereas in the East they usually preferred moist 

 situations. 



The genus Callopteryx was also found. This was especially noticeable as it had never 

 been known to occur west of the Rocky Mountains. 



After this a considerable time was spent in informal discussion and examination of 

 interesting specimens brought by members from various parts of the continent, and the 

 meeting then adjourned. 



