110 THE BUTTERFLIES OF CEYLON 
186. ‘Papitio (ZETIDES) DOSON, M., E. Papilio (Zetides) 
eurypylus jason, B. 
Evans gives doson as peculiar to Ceylon, with eletus as 
the S. Indian race; Bingham gives jason from Ceylon 
and S. India. Moore divides our Ceylon form into doson 
and telephus, he says that doson “‘ differs from 7. telephus 
in being larger, the transverse medial macular band much 
narrower in both wings. On the under side the medial band 
is also narrower, especially across the hind wing . . . ,, 
the outer black spots to the discal band are larger, and less 
bordered with carmine.” Extreme specimens are fairly 
distinct, but they vary, and it is easy to grade them. I[ con- 
sider the difference is seasonal. In March, 1917, I took 
ielephus at Wellawaya after two months’ drought, and doson 
in May after heavy rains. 
It is extremely plentiful at times all over the low-country, 
except in the extreme north, and I have taken it from 
Kottawa to Vavuniya. It sometimes “flights” in great 
numbers, and on rare occasions these flights visit the hills, 
and specimens may then be taken at any elevation. The 
males settle in crowds on wet patches on the roads and in 
river-beds, and a dozen or two may be covered at one stroke 
of the net. The females seem to be very difficult to obtain, 
and I-only possess a single specimen. 
187. PApILto (ZETIDES) SARPEDON TEREDON, E., B. Dal- 
china teredon, M. 
Also found in S. India. 
It differs from sarpedon in the narrower medial band across 
both wings, and in the upper portion of this band, on the fore 
wing, being of a more distinct greenish shade. The width of 
the band varies in Ceylon specimens, but the greenish tint is 
usually very pronounced ; in one of my specimens, however, 
it is almost indistinguishable. 
They may be seen day after day in the same place flying 
very fast round the tree tops, generally in pairs, but are then 
extremely hard to catch. The females occasionally visit 
flowers, but I have found it very difficult to get specimens in 
