THE CANADIAN ENTOMOLOGIST. l77 



each of the mandibles the integuments are dilated into a sac-like form 

 capable of expansion and compression at will, a portion of the thorax is 

 similarly constructed, and it is by the repeated dilating and compressing 

 of these sacs that the fluid contents of the body of the Aphis are trans- 

 ferred through the tubular mandibles to the stomach of the Chrysopa 

 larva. 



When the abdomen of the Aphis has been emptied, the points of the 

 mandibles of the Chrysopa larva are thrust in the thorax, and forward into 

 the head in every direction, and in a few moments nothing remains of the 

 once plump plant louse but a shrivelled skin. In the author's accessible, 

 I an tind no reference to these elastic bulb-like sacs at the base of the 

 mandibles, nor to the peculiar structure of the thorax, which admits of 

 its expansion and contraction as referred to. 



ANNUAL MEETING OF THE ENTOMOLOGICAL SOCIETY 



OF ONTARIO. 



(Continued from page 151.) 



Prof J. A. Cook Stated that from the European iarch he had taken 

 about 250 cocoons of Samia Colimibia, and found among them one pecu- 

 liar 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 Rhopalocerae. 



