a2 Ast Fie leh eee ot acinar Sa ieee iva Oia te 2 Meta eage 
ifren ne ¥ obs a Ted : = ; * . 7 aS a 
xcill 
obsolete, and in another specimen the basal part of the cell 
is for the most part yellow. 
(5) mixta Auriv. A richly coloured form linking together 
planemoides Trim., leighi Poult., and trophonius Westwood. 
(6) dorippoides Trim. This has been fully described by 
Roland Trimen. 
(7) cenea Stoll. Forms with the pale colour of trimenz. 
(8) cenea. Forms both with white and palé ochreous spots 
on the fore-wing. 
Besides these forms planemoides is known to occur in 
Nairobi, though it is not available for exhibition. All the 
2 2 as well as the 3 ¢ are larger than those from the higher 
ground. 
The great features of the species at Nairobi are—(1) the 
large number of different female forms; (2) the tendency of 
all the forms to exhibit primitive features, culminating in the 
form trimeni; (3) the frequency of the occurrence of inter- 
mediate forms for the most part with some _ primitive 
characteristics. 
All these features are developed to a greater degree in the 
subsp. polytrophus and are probably due to interbreeding 
with it. The forms from the higher levels are slightly more 
primitive, especially in the possession of rudimentary tails. 
MIMACRAEA MARSHALLI TRIM., AND ITS FORM DOHERTYI 
Rotus.—The Rey. K. St. Ausyn RoceErs also exhibited 
Mimacraea marshalli doherty: taken at Nairobi in October 
1920, together with typical M. marshalli from Rhodesia and 
Katanga, and a smallish example from Kavirondo, kindly lent 
by Prof. Poulton for comparison. He observed that dohertyi 
had been comparatively common in Nairobi and at certain 
places in the neighbourhood for two or three weeks of 
1920. 
With one exception, which was beautifully intermediate, 
not one of these numerous captures exhibited any definite 
approach to the type form; but a single specimen, also shown, 
captured on the high ground to the north of Mpapua, in 
Tanganyika Territory, is a decided intermediate, perhaps 
rather nearer marshalli. Transitional characters are seen in 
the orange-brown marking on the black apex of the fore- wing 
