Seasonal Dimorphism in African Butterflies. Ill 



ray idea, as to /. nachtigali being a seasonal form of 

 /. artaxia when we received a collection from Nyasaland 

 distinctly proving that both occurred together in splendid 

 condition at the same season. I have also proved that 

 J. simia, J. trimeni, and J. cuama fly there together 

 throughout a considerable portion of the year, and cer- 

 tainly both in the dry and wet seasons ; this is somewhat 

 disconcerting. 



In conclusion, I would observe that, whether the forms 

 of Acrsea with black apex be proved by breeding to be a 

 seasonal development of those which lack it, or not, there 

 is not the slightest doubt that they are varietal forms, 

 and not distinct species ; all of them, with the exception 

 of A, caldarena, being already linked together by inter- 

 grades in the British Museum series. 



9Tii APRIL, 1897. 



