Pseudacraea eurytus hobleyr. 615 
both terra and obscura, but it is almost impossible to find 
a specimen which one could describe as hobleyi or tirikensis 
influenced by terra or obscura. The specimen mentioned 
on p. 614 (Plate XXXIV, fig. 9), with fore-wings of 
hobleyt pattern and hind-wings of terra pattern, is the only 
exception to this which I have caught on Bugalla, out of 
the 356 Pseudacraeas. It has been pointed out on p. 614 
that the ¢ hobleyi with an orange suffusion on the hind- 
wing are probably mimetic rather than transitional. I would 
suggest that, in Uganda at any rate, hobleyi and turikensis 
are the most stable forms, and from them the others have 
been developed, namely ¢erra and obscura. 
The extraordinary number of transitional forms on 
Bugalla Island contrasts markedly with their scarcity on 
the mainland. In the very large collection presented by 
Mr. C. A. Wiggins to the Hope Department, which has been 
made in the neighbourhood of Entebbe on the mainland 
shore of the lake, only 25 miles or so to the N.E. of Bugalla 
Isle, there are relatively very few transitional specimens, 
and three out of the four mimetic patterns, viz. hobleyv, 
tirikensis, and terra, seem to keep very true to type. An 
account of the transitional forms observed in an examina- 
tion of the 1909 material from Entebbe is published in 
“IT. Congr. Internat. d’Ent.,”’ 1910, vol. u, p. 497. Among 
them was a form somewhat similar to that represented on 
Plate XXXIV, fig. 9, but much nearer to terra than this 
Bugalla specimen. Obscura appears to be an exception 
and to be variable on the mainland, but this form seems to 
be rare in the neighbourhood of Entebbe, and Mr. Wiggins’ 
collection contains only a few specimens. Mr. Neave’s 
much longer series from many localities in Uganda show 
great variety. 
The explanation of this relative variability of the forms 
of P. eurytus hobley: on Bugalla, and on Damba too, seems 
to be as follows :— 
The various Planema models which abound on the main- 
land, are relatively extremely scarce on these islands. The 
figures for Bugalla and for a part of the Wiggins collection 
have been given on p. 607, and it was also pointed out 
on p. 611 that the number of Planema epaea paragea was 
not a correct measure of their true relative abundance. 
I believe this scarcity on the island is due to scarcity of 
food-plant. I know the food-plants of both macarista and 
poggei—creepers which I never saw at all on Bugalla Island. 
