Seasonal Dimorphism in African Butterflies. 107 
The species of Acraa mentioned in my former paper 
will be now separately referred to. 
(1). A. anucreon, Trim. = A. bomba, Grose-Smith. 
As Mr. Marshall observes (p. 564), when he examined 
the British Museum collection there were five specimens 
labelled as A. bomba (=induna), 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. anacreon. 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, 1875, 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 type) 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. Iam 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- 
phanes 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. | 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 
