308 Professor E. B. Poulton on Mimetic Forms of 
more marked but very imperfectly defined buff discal 
patch. 
We now pass to the N.E. shore of the lake. The Hope 
Department possesses an interesting series of specimens 
kindly presented by Mr. C. A. Wiggins. They come from 
the Tiriki Hills, 5100 feet, twenty miles N.of Kisumu. In 
the more defined buff discal patch of the hind-wing the 
three males are a further advance in the direction of the 
Jallax form than that reached by any male I have seen 
from further west. In the four females the discal patch 
is slightly less pale than that of any as yet mentioned, 
while the rest of the hind-wing is more uniformly dark, 
They are in fact almost precisely similar to females of the 
kilimandjara form (see Plate XXI, Fig. 2a) from the moun- 
tain after which it was named by Oberthiir; only differing 
in the smaller size of the discal patch and its slightly paler 
tint. A single female obtained by Mr. Wiggins at Kaka- 
mega’s (5500 ft.) near Mumias on the Uganda Railway, 
about fifteen miles N.E. of Kisumu, is of the same type, 
but the patch is even smaller and very slightly deeper in 
tint. Mr. C. A. Wiggins’ Nyanza and ‘Toro specimens 
were identified as forms of A. lycoa by Mr. 8. A. Neave 
(Nov. Zool., vol. xi, March 1904, pp. 348, 349), and I find 
that the same forms from Toro and Nyangori are labelled 
“Tycoa?” by Miss E. M. Sharpe in the A. H. Harrison 
Collection. 
We now pass to the most eastern specimens I have 
examined, viz. those kindly sent me by Rev. K. St. Aubyn 
Rogers from Taita, Taveta, and Kilimanjaro. In these 
forms the buff-spotted males with an enlarged discal 
patch of pronounced buff (Plate XXI, Fig. lv) mimic the 
buff-spotted and buff-patched Amausis echeria, while the 
a -spotted females (Plate XXI, Fig. 2a) with shehtly 
paler buff patches, also enlarged as compared with the 
Nyanza forms, mimic Amauris albimaculata and the white- 
spotted forms of A. echeria. They are certainly Rogen- 
hofer’s fallax and Oberthiir’s kilimandjara. They are 
equally undoubtedly the eastern forms of Aerwa lycoa, 
modified by the mimicry of Danaines not known on the 
west coast, The sexual dimorphism of lycoa persists in 
fallax, and remains of the same kind though very different 
in degree; for, as pointed out above, the males bear buff 
spots on the fore-wing and the females white, while the 
discal patch is paler in the latter sex. The johnstoni of 
