some British East African Butterflies. 491 



II. Belenois-centred Combination from Taveta . . 539 

 1. Fesemblance between a female Teracolus vesta 

 and a female Belenois severina talien together 

 at Taveta. E. B. P 541 



D. NOTES ON THE SEASONAL FORMS, Etc., OF PRECIS 



IN BRITISH EAST AFRICA 541 



(a) Precis sesa,mus ....... 542 



(b) Precis antilope 544 



(c) Precis archesia, wet season furm pclas(jis. E. B. P. 545 



(d) Habits of Precis natalica and P. elyica . . 546 



APPENDIX : 



Description of neiu forms of BritisJt East African 

 butterflies in the Hope Department, Oxford Uni- 

 versity Museum, chiefly collected by the Bev. K. St. 

 Aiibyn Rogers, by Roland Trimen . . . 547 



Introduction. 



[I HAVE added to the following memoir many records of 

 observations received in letters from tlie author. In most 

 cases such notes are printed separately with the address 

 and date of the letter in which each was contained. 

 Occasionally the record had been cut out of the original 

 letter and the address lost. In a few cases the statements 

 in letters have been added to the memoir without any 

 indication. My own notes, etc., are always clearly 

 discriminated, and signed by my initials. 



E. B. POULTON.] 



These notes on the Bionomics of East African butter- 

 flies owe not merely their origin but their whole scope 

 and character to Professor Poulton, The observations 

 on which they are based were undertaken at his sugges- 

 tion and under his guidance, and he has been good enough 

 to work out the whole collection and to look over all the 

 sheets of the paper, and send me the most valuable help 

 and suggestions during its progress. In particular the 

 tables of dates and localities of the several combinations 

 are due entirely to him, and it is not too much to say 

 that without his aid these notes could never have been 

 compiled at all. 



I have also to acknowledge the kind assistance of Dr. 

 Dixey with regard to the Pierinx. He has continually 

 placed at my disposal his unique knowledge of this group. 



