CEYLON BUTTERFLIES. ll 
wing ; subdita has a much larger ochreous one. Bingham 
discriminates the two former by hind wing under side :— 
Posterior three ocelli only in a straight line = perseus. 
Posterior four ocelli straight — polydecta. 
From my specimens this does not seem entirely reliable, 
as I have very typical polydecta in which the last four ocelli 
are not straight, though not so much out of line as in typical 
perseus. 
Personally I know no rule by which I can separate the two 
with certainty, as they grade almost perfectly into one another. 
C. subdita has a far larger and lighter sex mark than either, 
but the female is, so far as I can see, quite indistinguishable 
from polydecta 9. 
The breeding experiments I have carried out so far are 
quite inconclusive. Being bred where the female was caught, 
they have, as was to be expected, bred fairly true. The very 
small number of collectors in the Island prohibits experiments 
being carried out on a large enough scale to settle the question. 
17. CALYSISME RAMA, E.; Calysisme drusia, M.—Peculiar 
to Ceylon, and only found in the wet zone. Moore describes 
C. drusia from a single specimen taken in the Kottawa forest. 
C. rama has been taken there, and Moore’s description agrees 
fairly well with it. 
I procured specimens of the dry season form from Ratna- 
pura in March, 1917. It differs in having the ocelli and other 
markings on the under side more or less obsolescent and the 
ground colour paler. The upper side is almost identical with 
that of the wet season form in both sexes. 
Till recently it was only known from specimens taken at 
Udagama (near Kottawa) by the late Mr. John Pole. It has 
now been discovered to be quite common in bamboo jungle 
at Ratnapura. 
I have never taken it personally, but have specimens given 
to me by Mr. Mackwood from Ratnapura, and some caught 
by a native collector at Kottawa. 
It can be distinguished at once by the colour of the under 
side, which is ochreous brown, viz., far more yellow than in 
any other Ceylon Calysisme. , 
** Also Kelani Valley” (F. M. Mackwood). 
