308 Professor E. B. Poulton on Mimclic Forms of 



more marked but very imperfectly defined buff discal 

 patch. 



We now 23ass to the N.E. sliore of tlie 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 

 fallax 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 

 Jdlimandjara form (see Plate XXI, Fig. 2a) from the moun- 

 tain after which it was named by Oberthlir; only differing 

 in the smaller size of the discal patcli 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 deej^er in 

 tint. Mr. C A. Wiggins' Nyanza and Toro specimens 

 were identified as forms of A. lycoa by Mr. S. A. Neave 

 (Nov. Zool., vol. xi, March 1904, pp. 348, 349), and I find 

 that the same forms from Toro and Nyangori are labelled 

 " hjvoa ? " 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 buft'-spotted males with an enlarged discal 

 patch of pronounced buff (Plate XXI, Fig. 1«) mimic the 

 buff-spotted and buff-patched Amauris cchcria, while the 

 white-spotted females (Plate XXI, Fig. 2(x) with slightly 

 paler buff patches, also enlarged as compared with the 

 Nyanza forms, mimic Amauris albimaculata and the white- 

 spotted forms of A. echcria. They are certainly Rogen- 

 hofer's fallcm and Oberthlir's Icilimandjara. They are 

 equally undoubtedly the eastern forms of Acrxa 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 wliite, while the 

 discal patch is paler in the latter sex. The johnsioni of 



