some British Fast African. Buttcrjiies. 533 



from the model in the absence of basal orange marks, 

 somewhat conspicuous against the yeJIow ground colour. 

 Tendloidcs appears to display more evidence of special 

 adaptation and a smaller use of ancestral features in the 

 attainment of a mimetic appearance, than cahiroides. 



Type captured, March 12, 1907, at Weithaga, N. Kikuyu, 

 British East Africa ; in Hope Department, Oxford Uni- 

 versity Museum. 



The tendloides form was taken in coitu with the male of 

 A. alicia on March 14, 1907. 



These two female forms are probably specially developed 

 in N. Kikuyu in relation to the abundance of cahira and 

 tcnella. I have not found the same sharp differentiation 

 into two contrasted forms in the females from other locali- 

 ties which I have had the opportunity of studying. Very 

 great variation in the under surface pattern of the 

 females was however always evident ; and even at Wei- 

 thaga intermediate forms appear, while distinct traces of 

 the cahiroides pattern, invisible at a little distance, can be 

 made out on a careful examination of some of the tenelloides 

 females. E. B. P. 



2. The peeuliar aposematic pattern of the under surface in 



the male Acrxa alicia. E. B. P. 



The visible under surface of the male of this species 

 and the allied A. uviii, Grose-Smith, possesses a remark- 

 able and characteristic pattern. The ground colour and 

 apical bar of the fore-wing are bright yellow, the sub- 

 apical bar of the fore-wing and the border of both wings 

 deep black, the border containing prominent yellow mark- 

 ings, developed along the hind margins of both wings. 

 The sub-basal row of black spots of the hind -wing is so 

 strongly developed as nearly to form a continuous band, 

 within which the ground colour assumes a greenish tint. 

 The effect of the simple pattern thus briefly described is 

 very peculiar and unlike that of other Acrseas. E. B. P. 



3. l''he synaposematic up)per surface pattern of Acrsea alicia, 



uvui, etc. E. B. P. 



Although the females are so different from the males on 

 the under surface, that of uvui resembling the fulvescens 

 form oi Acrwajohnstoni (see p. 516), the pattern of the upper 

 surface is very similar in the two sexes. The females of 



