THE BUTTERFLIES OF CEYLON 53 
remains the difficulty of allotting the right male to the right 
female, and this can only be settled, with certainty, by 
breeding. The only Ceylon record of this that I can find is 
in “Lepidoptera of Ceylon” where it is stated that prominens 
feeds on Vateria indica. Bell has bred two species of the | 
group in India, but I have not yet seen his specimens. 
Fruhstorfer says we have three species in Ceylon, and I find 
this is correct, though there may be a fourth, as I have found 
four distinct forms of genitalia. Pending further investiga- 
tion I can only describe the forms I have so far examined. 
Males. a. A small form, paler blue than the others, wings 
rounded and transparent, the white strige below showing 
through very clearly. The strige are wider than in any 
other Ceylon form and are often very diffuse. The genitalia 
(Plate 7, fig. 8), do not agree with any of Fruhstorfer’s figures, 
but are nearest to those of berenice isana. It may prove to be 
a seasonal form of berenice ceylonica. I have called it atrata 
in my table. 
6. A large form attaining up to 36 mm. in expanse, 
darker than a. Wings rather pointed and only slightly 
transparent. The white strige below narrower, but very 
much broken up and tangled on the hind wing. 
It resembles Moore’s type of prominens in the British 
Museum collection and the genitalia are those of perusia, 
(Plate 7, fig. 5), so it is clearly Fruhstorfer’s perusza 
prominens, 
c. Smaller and slightly darker blue. Wings rounder, 
lightly transparent. White strige below slightly narrower, 
but much more regular. 
The genitalia are nearest to those of berenice plumbeo- 
micans, but have the “abnormal wide band” Fruhstorfer 
mentions as characteristic of berenice ceylonica. (Plate 7, figs. 
6and 7). I have classed it as frominens in my table, but I 
am clearly wrong in this. | 
d. Small and much darker. Wings quite opaque. Strigze 
below very narrow and clearly defined. I have always 
regarded this as plumbeomicans, but the genitalia are 
