34 Canadian Record of Science. 



Hagenii after Dr. Hagen, supposing it to be distinct, but 

 which was found by breeding to be merely a yellow 

 polymorphic form of this species. 



Another fine example of polymorphism is the case of 

 Papilio Ajax with its forms Walshii, Telamonides and 

 Marcellus. Of these forms the first two are Spring forms 

 both coming from chrysalides of the previous year, Walshii 

 appearing first and Telamonides shortly afterwards, and 

 Marcellus being the summer form, but the relations of 

 these forms to each other are very curious and could only 

 be made clear by an extended notice, but Mr. Edwards 

 sums up the results thus : — 



Walshii produces Walshii, Telamonides and Marcellus, 

 the same season ; Telamonides produces Marcellus the 

 same season and its own type in the following Spring ; 

 Marcellus produces successive broods of Marcellus the 

 same season and occasionally Telamonides, and the last 

 brood produces Walshii and Telamonides in the Spring. 



In conclusion, we may consider the possible causes of 

 dimorphism and polymorphism and the results which 

 are likely to follow. 



Some cases of dimorphism, especially the strongly 

 marked cases of sexual dimorphism and the cases of 

 partial dimorphism are extremely obscure, as it is im- 

 possible to assign a reason as yet why Turnus male 

 should not be affected by the climatic changes in the 

 southern range of its habitat except to become larger and 

 finer, while the female is turned into a nigger. 



But in some cases such as the cases of complete and 

 seasonal dimorphism, it doubtless results from the greater 

 or less heat at the time the different broods are maturing^ 

 while in the case of Lycai-na Pseudargiolus it probably 

 results in part from climatic conditions and in part from 

 the difference, and abundance or scarcity of tlie food of 

 the different broods. This species is of such a dainty 

 appetite that it does not feed on the leaves of its food 



