THE BUTTERFLIES OF CEYLON 49 
B. Under side fore wing ; white strigz on basal area. 
a2. Apex of fore wing very acute = viola. 
62. Apex of fore wing not very acute, 
3. Basal strige not extended below median vein; no 
tail. 
a4. Under side hind wing; small black spot in 
tornal angle, and much larger one in interspace 
2 =noreia. 
b4. Under side hind wing; small black spot in 
tornal angle anda very slightly larger one in inter- 
space 2 = dana. 
63. Basai strige extended below median vein 
a5. Expanse under 25 mm, = ardates tailed and 
tailless. 
b5. Expanse over 25 mm.; tailed. 
ab. White strigee on under side fore wing, wide 
and often diffuse. ¢ wings transparent, 
markings of under side visible above. 
? patch on fore wing and majority of hind 
wing white in some lights=atraia, B. 
66. White strige on under side fore wing narrower 
but clearly defined and prominent. g wings 
slightly transparent, 2 patch on fore wing 
and majority of hind wing blue, never white 
=prominens, M. 
c6. White strige on under side of fore wing still 
narrower, especially in the g. ¢ darker, 
wings quite opaque. @ patch on fore wing 
darker and smaller, iridescent blue patch on 
hind wing small or absent=plumbeomicans, 
De N. 
The great objection to this table is thatit largely depends 
on the old fallacy that the exception proves the rule. For 
instance—the ardates and atrata groups are separated by the 
distinction of size, all under 25 mm. being classed as the 
latter. Specimens of the aivata group (05.) under 25 mm. 
are very common and I have two or three which only measure 
18 mm. in expanse. 
