of female in the Lagos district with those of Entebbe. In the absence 
of Planema tellus the fulvous form of female is relatively rare near 
Lagos and, when it occurs, presents a somewhat different pattern, 
probably following the male of Planema eb@ea CRAM. as a model. 
My experience of this latter form of the female A. jodutta on the 
west coast is however insufficient to justify a safe conclusion. The 
white-marked females of the west differ from those of Entebbe in 
the greater extension of the white patch caused by the invasion of 
the fore wing by the pattern of the hind. I have observed this feature 
not only in many specimens captured in the Lagos district, but also 
in 16 females of a family recently bred by my friend Dr. W. A. 
LAMBORN. These shewed no appreciable individual difference in 
the extent of the white patch in question. This extension of part of 
the pattern in the west corresponds with the same marking in the 
western model, the female Planema epwa. The two white-marked 
female Planemas at Entebbe are, on the other hand, without this 
invasion, or, at the most, exhibit Gn //. a/cinoe) but a faint trace of it. 
They are followed at a distance by the carmentis female of the Ent- 
ebbe jodutta with its reduced fore wing patch. Reduced as this 
patch is, and rendered greyish by overspreading black scales, it still 
influences not only the white females of Acrwa althoffi DEWITZ 
(see p. 504), but also appears to affect the variable female of 
Pseudacrea hobleyi, which in this respect commonly possesses 
the pattern of the Acrwa mimic rather than that of the Planema 
model. The slight difference between the western and the Entebbe 
carmentis female of jodutta, and its correspondence with the 
difference between their respective models is also adverse to the 
mutation theory of the origin of mimicry recently advanced by 
Prof. PUNNETT, unless indeed a « mutation » may be only 
another name for a small variation such as the Darwinian has, for 
half a century, believed to supply the material for mimetic 
modification. 
As regards the base of the hind wing under surface, both white 
and brown females of jodutta commonly possess rather larger spots 
than the males, thus tending in the direction of their respective 
models, while the white-marked female also clearly exhibits an 
early stage in the development of the characteristic brown 
triangle. 4 
It is interesting to note that one small but important detail in the 
mimetic resemblance of these two females exists ready-made in 
