CEYLON BUTTERFLIES. 45 
The great objection to this table is that it largely depends 
on the old fallacy, that “ the exception proves the rule.” 
Tor instance, the atrata group are separated from ardates 
by the question of size, all under 25 mm. being classed as the 
latter. My smallest specimens are the white variety of female 
atrata, and a variety which was flighting in great numbers in 
September, 1915, which is certainly not ardates, but probably 
a dwarf form of plumbeomicans. 
Again, an important division depends on whether the basal 
pair of strigz are continued to vein 1. I have a series of tailed 
ardates, otherwise quite normal, showing every graduation, 
from the strige stopping at the median vein till they reach 
vein 1. 
As our knowledge now stands, it is nearly impossible to say 
how many species we have in Ceylon. 
( 90. NacapuBA MacRopTHALMA.—Found in India, Malaya, 
| and Australia. 
| 91. NacapuBa PAVANA.—Found in India, Burma, Java, 
L&e. 
The latter is not mentioned in Moore. This group is 
unfortunately rare at Haldummulla, so I have a comparatively 
poor series. My specimens are easily divided into two 
groups :—- 
(1) Male very large, my largest being 39 mm. in expanse ; 
white strigze on under side rather broad and diffuse. Female: 
blue area very large, extending to at least four-fifths of the 
posterior portion of fore wing ; veins across the blue area 
very clearly marked in dark brown ; under side, white markings 
more diffuse. This, I take it, is a form of macropthalma. 
(2) Male smaller, average about 30 mm., darker in colour 
on upper side, white strigze on under side narrower and more 
clearly defined. Female: blue area darker, and much 
reduced in size ; the veins very -indistinctly marked ; under 
side white strigze clearly defined, but broader than in the male, 
a complete series of dark oval spots along margin of fore wing 
and along hind wing down to interspace 2. 
The female is usually much smaller than the male, one of 
mine measuring only 22 mm. 
