180 THE CANADIAN ENTOMOLOGIST. 



Mr. Grote presented some instructive facts in relation to the identity 

 .of some of the White Mountain moths with those of Labrador. Mr. 

 Riley enquired whether many Caloptenus had been found on Mount 

 Washington, and expressed the opinion that a race of spretus had been 

 found there. 



Mr. Saunders enquired of the Michigan friends whether Pieris rupee 

 had been found in the State. Prof. Cook stated that it had not yet 

 appeared in Michigan ; he remarked that protodice was much more 

 numerous than oleracea. Mr. Riley stated that protodice was most 

 abundant throughout Illinois and Missouri. Mr. Ison, of Cleveland, 

 stated that rapes, appeared in his neighborhood for the first time last spring; 

 at first it was found along the lake shore, but before the season closed it 

 was abundant throughout the greater part of the district over which his 

 observation had extended. Mr. Ison said that with them the larva seemed 

 to prefer mignonette to cabbage. In reply to a question as to the correct- 

 ness of the views advanced by some Entomologists in regard to the color 

 of the imago being affected by this food plant, Mr. Lintner said that he 

 had, from among 500 or 600 specimens fed on cabbage, found a number 

 of the yellow variety. Mr. Riley stated that the larva of protodice was 

 also partial to mignonette. 



Danais archippus formed the next topic of discussion. Mr. Cook had 

 found the larva this season peculiarly infested by several parasites. Mr. 

 Riley had seen Tachina flies bred from archippus. Mr. Saunders had 

 reared, on one occasion, a large number of small Hymenopterous parasites 

 from a chrysalis. He also asked the members if any explanation could 

 be given of the reason why this species assembled occasionally in immense 

 swarms and migrated thus from place to place, and referred to instances 

 of such swarming. Mr. Ison referred to an immense swarm which passed 

 over Cleveland three years ago. In this instance it appeared as if they 

 had crossed the lake from Canada ; they were seen in immense numbers 

 for three or four days. Archippus was said to occur in Australia, where 

 it also occasionally swarms. 



(To be concluded in our next.) 



