48 THE CANADIAN ENTOMOLOGIST. 



Columbia they are white at base and a very light straw color above. The 

 remaining tubercles of cecropia are black at the base and blue above ; in 

 Columbia they are black at the base, but with the look of white glazed 

 porcelain above. These distinctive characters showed no tendency to 

 run into each other in any of the examples I have seen. As perhaps 

 having a bearing upon the question whether Columbia is a hybrid between 

 cecropia and promcll/ca, I will say that in six years of careful collecting at 

 this place I have never taken a promethea, nor has one ever been taken 

 here to my knowledge ; yet the empty cocoons of Columbia have occasion- 

 ally been found, mostly in larch trees, in one instance about forty feet 

 from the ground. 



I am therefore convinced that Columbia is a good species, but whether 

 distinct from Glovcri I am not prepared to express an opinion. 



In my observations on Columbia I have been greatly assisted by Messrs. 

 Allen and Fish, who rendered every possible aid and placed their notes 

 at my entire disposal. 



ON FOOD PLANTS OF PAPILIO CRFSPHONTES (THOAS). 



BY THE EDITOR. 



In September last we were much gratified, although somewhat sur- 

 prised, at receiving a number of the larva? of this beautiful butterfly from 

 Mr. S. Eccles, of St. Thomas, Ontario, a town situated about 17 miles 

 south of London, and about half way between it and Lake Erie. They 

 were found in Mr. Eccles' garden, feeding on Dictamnus fraxi/iella, a 

 perennial herb which is a native of Southern Europe, but cultivated in 

 this country for ornament in gardens. The larva: were in different stages 

 of growth, from one to two inches in length, and were feeding greedily on 

 the plant referred to. We had never seen this larva before, but its mark- 

 ings are so peculiar that we recognized it at once from recollection of the 

 figure given in Boisduval & LeConte, pi. 13. As this description may not 



