614 Dr. G. D. Hale Carpenter on 
suffusion at the costal end of the white bar crossing the 
hind-wing, a tendency which is feebly developed in the 
specimen figured on Plate XXXV, fig. 12, and is only 
strongly marked in a single specimen from Bugalla 
(Plate XXXIV, fig. 9, No. 57 on the list). This interest- 
ing example is a male with fore-wings like the typical 
hobleyi, but hind-wings above of the terra form. Below, 
the hind-wings show the umber triangle of hobley: well 
developed. There is little doubt that this specimen is a 
blend of terra and hobleyi, but, as regards the former 
examples, with slight orange suffusion, it must be remem- 
bered that the ¢ Pl. macarista itself often exhibits the 
same coloration. Indeed, in W. Uganda, Mr. Neave 
collected 2 examples of Pl. pseudeuryta, Hew:, with the 
pattern of macarista, but the hind-wing bar on the upper 
surface entirely orange; and one of these was accompanied 
by a ¢ hobley: with the same colouring. It is therefore 
probable that the forms here referred to are a mimetic 
modification of the ¢ hobleyt. 
Class (2), the intermediates between obscura and terra, 
form a far more perfect transitional series. Commencing 
with a terra which shows merely a slight dusky suffusion 
at the margins of the orange areas, and a little dark colour 
along the nervures, one can trace the gradual increase of 
the obscura dark colour until one reaches a point midway 
between the two forms (e.g. Plate XXXVI, fig. 17); 
beyond this the terra colour is more and more swamped 
until one gets to specimens of obscura showing only a 
sprinkling with orange scales on the inner margin of the 
fore-wing. S. A. Neave’s type of obscura, in the Hope 
Department, is really one of these intermediate forms. 
What may be considered the real obscura has no orange 
colouring on the upper surface, and it is a much better 
mimic of its model, Planema epaea paragea. 
The commonest form, of all those on the island, is terra, 
the least common, obscura. The latter appears to be the 
least stable: it is, in fact, quite difficult to find one which 
shows no transition towards terra, hobleyz or tirikensis, and 
even those not transitional exhibit considerable variation. 
On the other hand, the forms hobleyi and turikensis appear 
to be the most stable: they are very true to type and show 
extraordinarily little variation. It has already been shown 
that they very strongly impress their most characteristic 
feature, the umber basal triangle, on the hind-wings of 
