THE BUTTERFLIES OF CEYLON D9 
I have also noted that ¢ d. flights with 9 d. Fruhstorfer 
names ¢ d. and 9 a. atrata gythion ; 3 and 9 b. perusia pro- 
minens ; and gc. and @ d, berentice ceylonica, closely allied to 
plumbeonucans Moore names g and 9 b., prominens and ¢ 
and @ d, atrata. De Nicéville names g and 2d, plumbeomicans. 
Therefore the only species on which we agree is prominens. 
Confusion may have arisen through the wrong identification 
of the ¢ of typical @ atvata, from Java; Fruhstorfer. says 
atrata, berentce, and perusia all occur in Java. Ofcourse the 
fact that atvata 2 in Java has a white patch on the fore wing 
does not necessarily imply that the females of races of atrata 
elsewhere should show that patch, in fact, considering the 
variability of the genus, I consider it most improbable. 
95. NACADUBA NORA (tailed). 
95a. NACADUBA ARDATES (tailless) Nacaduba noreia, E. 
Evans writes: “I believe with various other writers that 
nora and noreia are separate species ; nora, the tailed form, is 
also yellow below.’’ Bell also. believes them to be distinct. 
He has bred both and says the larve are very similar. 
Personally I am of opinion that the two forms are distinct 
but I agree with Bingham and De Nicéville in thinking that 
the tailless form does not answer at all to Felder’s description 
of mnoreia, which I consider quite a distinct species. 
Apparently zora should stand for the tailed form and ardates 
for the tailless, 
It is hard to define any difference between them, but the post- 
discal pair of strigeze usually appear to be nearer the terminal 
margin in the tailless form, and sometimes even touch the 
sub-terminal markings. The bands enclosed by the strige 
also seem comparatively broader. I have never yet seen 
the variety of the female with the yellow under side without 
tails, and in both sexes the tailed form is the most variable 
in the ground colour of the under side, 
In the atvata group we had four forms, very similar 
externally, and apparently grading into one another, but 
readily separable by the very distinct genitalia of the males. 
In this group we have three forms, easily separated by their 
