( Ivii ) 



that the glade had only been made about three and a half 

 months, and was therefore practically virgin ground. 



Although I saw wahlhergi in coitu on several occasions 

 and mima once, I never saw the two forms pairing together, 

 and not very frequently flying together, except on the after- 

 noon of January 12, when there was a very bad storm with 

 hail, and all species of butterflies were going to rest unusually 

 early. It is very unfortunate- I have not been successful in 

 getting any ova from the 9 s kept for this purpose, but even 

 had I done so, I am not at all sure that I know the food 

 plant. Roland Trimen, F.R.S., in his work suggests a tree, 

 but I think that the Buck Weed is far more probable, as nearly 

 all tlie recorded specimens were settling on or flying over this 

 plant. I several times searched unsuccessfully for the pupa- 

 cases, although a great many of the laahlbergi had scarcely 

 dried their wings when captured, and in several cases I 

 observed on the leaves beneath the spot where a butterfly had 

 been resting the excretory fluid which is ejected shoi-tly after 

 emergence. 



Professor Poulton also exhibited Mr. Guy A. K. Marshall's 

 latest demonstration of seasonal phases in South African 

 species of the genus Precis — the proof, by actual breeding, 

 that P. hokuoa, Wallgr., is the dry season phase of P. ceryne, 

 Boisd. 



The female parent of the wet phase was captured April 2, 

 1905, at Salisbury, Mashonaland (5000 ft.). The eggs were 

 laid on the following day, and all hatched April 13. The 

 eight oifspring were treated, and went through their trans- 

 formations as follows : — 



1905. 1905. 



]. Pupated May 9. Emerged May 27, as a dry phase $ 

 12. „ „ 31, „ „ c^ 



12. ,, ., 31, ,, ,, V 



12. „ June 1, „ „ 9 



13. „ „ 1, „ „ $ 

 15. „ „ 2, „ „ c^ 



7. Pupated and subjected to damp heat, May 15, 1905. 



Emerged May 23, 1905, as a dry phase $ 



8. Pupated and subjected to damp heat. May 15, 1905. 



Emerged May 23, 1905, as a dry phase $ 



