650 Dr. G. D. Hale Carpenter on Pseudacraea boisduvali. 
well marked indeed in 6 of the 8 island specimens (Plate 
XXXVIII, figs. 2, 6, 7), and one of the two mainland 
specimens (from Kampala). In another island specimen, 
and the second mainland male (from Buddu) the basal 
suffusion is less marked, though it is nevertheless more 
pronounced than in the Eastern triment form. In the 
remaining island male the basal black is only just notice- 
able (as it is in one specimen bred by the late A. D. Millar 
in Natal and the one caught by Rogers near Mombasa). 
If we then consider these two points, namely, the degree 
of development of the orange subapical area, and the basal 
black suffusion, the conclusion is irresistible that the 
& Ps. boisduvali in Uganda (Plate XX XVIII, figs. 2, 6, 7) 
is intermediate between the trvmeni form of the East with 
well-developed orange bar and no basal black (Plate 
XXXVII, fig. 11), and the true boisduvali form of the 
West, with no orange and well-developed basal black 
(Plate XX XVII, fig. 2), but that on the whole it is nearer 
to the latter and more closely resembles Acraea egina, the 
Western model, than Acraea zetes, the Eastern model, 
although, as I have said, zetes is plentiful enough on the 
island. 
In testing this conclusion by comparing the figures 
on Plates XXXVII and XXXVIII, it is necessary to 
make allowance for the difficulty of representing black, red 
and orange in their full values by means of a plate pre- 
pared from a photograph, however good. By screening, 
long exposure, and sensitive plates, Mr. Alfred Robinson 
has produced very fine results, but the added advantage 
of colour is indispensable for the adequate representation 
of such butterflies as the forms of Pseudacraea boisduvalr 
and their models. 
As regards the red spots along the black margin of the 
hind-wing, the Bugalla Pseudacraeas come nearer to zefes, 
but this is a comparatively inconspicuous feature. It is 
an extraordinarily interesting thing that bovsduvali should, 
on the West Coast, forsake its Hastern model for another 
Species (a representative of which is present as eguna 
areca, Mab., on the East Coast), although its Eastern 
model has a common Western form, zefes zetes. Large 
collections made without prejudice might explain this by 
showing that egina is predominant in the West as zefes 
acara certainly appears to be in the East, but this is yet 
to be done. 
