Seasonal Dimorphism in African Butterflies. 107 



The species of Acrsea meutioned in my former paper 

 will be now separately referred to. 



(1). A. anacreon. Trim. = A. bornba, Grose-Smith. 



As Mr. Marshall observes (p. 564), when he examined 

 the British Museum collection there were five specimens 

 labelled as A. bomba (=induna) 9 four of which I have my- 

 self proved to be A. anacreon, inasmuch as the apical 

 patch is not filled in, though more heavily marked than 

 in typical A. auacreon. When, however, Mr. Marshall 

 asserts that the female, admitted to be A. induna, has no 

 connexion with the latter, he is certainly wrong, for we 

 have since received the male, agreeing perfectly with Mr. 

 Grose- Smith's figure and tolerably closely with Mr. 

 Trimen's. This example was captured together with a 

 typical male of A. anacreon, by Mr. Crawshay, on the 

 15th September, 18 J 5, on the Chuona River, Mwewe's 

 Town, Unyika. If there were any constant difference of 

 pattern on the under surface of the wings between 

 A. anacreon and A. bomba (= induna), it would be possible 

 to force oneself to credit the distinctness of these 

 forms, even though they were captured simultaneously. 

 But there is no constant difference, and absolutely the 

 only distinction between these two specimens, on the 

 under surface, consists in the absence, in the A. anacreon 

 type, of the three dots beyond the cell of the primaries, 

 which (in that tjpe) are usually strongly defined. As a 

 matter of fact the only constant difference between typical 

 A. anacreon and typical A. bomba consists in the absence 

 or presence of the tawny submarginal spots on the apical 

 area of the primaries above. I am therefore certain, in 

 spite of these two forms having been taken together 

 (which Mr. Marshall frankly admits to be immaterial and 

 due to the overlapping of seasons), that A. anacreon and 

 A. bomba represent the extreme developments of one 

 species in Nyasaland, whether they do or not in southern 

 S. Africa. 



(2). With regard to the seasonal character of A. peri- 

 plianes and A. guillemei, Mr. Marshall, having seen 

 two specimens of the former in our collection, has his 

 doubts thereon ; but he does not comprehend the want 

 of the heavy marginal border in the secondaries. I am 

 now able to resolve those doubts, as other specimens 

 (linking the two in an extraordinary manner) have been 

 since received ; these specimens prove beyond all question 



