154 SPOLIA ZEYLANICA. 
says that doson “ differs from Z. 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 consider the difference is seasonal. 
In March, 1917, I took telephus 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 have not yet 
succeeded in capturing a single specimen. 
189. DatcHINA TEREDON, M.; Papilio sarpedon teredon, 
B.; Zetides sarpedon teredon, K.—Also found in Southern 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 
good condition. The males are much addicted to settling on 
wet roads, but are not gregarious like doson ; usually there is 
only one on the wet patch, and to find more than two is 
extremely rare. 
They are very plentiful at Haldummulla all the year round, 
and I have found them common at Kottawa, near Galle, and 
at Ohiya (6,000 feet). They become much rarer in the drier 
districts, and I have not yet seen a specimen in the northern 
half of the Island. They do not join in the flights. 
