52 THE BUTTERFLIES OF CEYLON 
It is apparently rare everywhere. I have taken about half 
a dozen males settled on wet roads at Haldummulla, and 
have specimens from Galle and Deniyaya. The genitalia 
agree with Fruhstorfer’s figure of those of viola from Sumatra, 
gt. NACADUBA DANA. 
Also found in India, Burma, Dutch Indies, New Guinea, 
etc. 
Fruhstorfer, in common with all other writers, does not 
give Ceylon as a locality. He names the Indian race dana 
dana, and our form is apparently identical, both externally 
and in the genitalia. 
It can be at once recognised by the fact that it is the only 
Ceylon Nacaduba which does not possess the conspicuous 
large black spot in interspace 2 of the under side of the hind 
wing. There is only a minute spot, nearly equal in size to 
the one in the tornal angle. 
I have taken more than a dozen males settled on wet 
roads, or in beds of streams, at Haldummulla, and in May, 
1916, I found it very abundant at Wellawaya, and also took 
one at Tanamalwila, on the borders of the Southern and Uva 
Provinces. I have also got it from Ratnapura. 
It is tailless, and may easily be mistaken for a tailless 
ardates when settled, but is of a distinctly lighter blue when 
flying. 
The female is very rare, and I have only taken two speci- 
-mens 
92 NACADUBA ATRATA, M. N. atrata gythion. Fruh. 
93. NACADUBA PROMINENS, M. WN. perusia prominens. 
Fruh. 
94. NACADUBA PLUMBEOMICANS, De N. WN. berenice 
cevlonica. Fruh. 
This group has always given a lot of trouble. The species 
have a very extended range, and are very variable in different 
localities, and from seasonal causes, and no writers agree in 
their nomenclature. 
Fruhstorfer has done good service in pointing out that the 
only certain way to identify the males is by an examination 
of the genitalia, which differ widely in each species, but there 
