39 ) 



DATES IN 1911. 



FORMS OF 1'SEUDACRAEA. 



1st half Sept. 



1 6 terra (typical). 



1 ? ,, 



2 6 hobleyi (1 typical, 1 with li.w. bar fulvous instead 

 of white). 



2nd half Sept. 

 (17th-30th.) 



9 hobleyi (typical). 



y terra (beautifully transitional to obscura). 



6 obscura (with distinct traces of the fulvous colouring 



of terra on f.w. inner margin). 



9 obscura (subapical f.w. bar white as in 9 hobleyi, 



but narrower, and the remaining white pattern of the 



latter very faintly visible. 



1. Proportions of the Mimetic Forms and of the 

 Models. — The proportions in the Entebbe District are well 

 shown by the following figures, which summarise nearly 



[xciii 

 the whole of this material collected by Mr. Wiggins between 

 May 23rd and Aug. 31st, 1909* :— 



* Quoted from "Mem. I. Congr. Internat. d'Ent., Brussels," Vol. II, 

 p. 483, 1910. This paper contains a nearly complete list of captures, be- 

 tween the above-mentioned dates, of all the species concerned, except 

 Planema paragea and Pseudacraca obscura. The proportions of these two 

 latter were taken from a list recently prepared by Mr. C. A. Wiggins and Prof. 

 Poulton. In the course of this work it was found that one or two days' 

 captures had been accidentally omitted from the paper referred to above. 



