(2069) Chlidonias leucopareia javanica.
THE JAVAN WHISKERED TERN.
Sterna javanica Horsf., Trans. Linn. Soc, xiii, p. 198 (1820) (Java) Hydrochelidon hybrida. Blanf. & Oates, iv, p. 307 (part).
Vernacular names. None recorded.
Description. A very dark bird, the breast and abdomen almost black.
Colours of soft parts as in the other races.
Measurements. Wing 217 to 233 mm.; culmen 28 to 31 mm.
Distribution. Assam, Burma, Malay States to Java and Celebes.
Nidification. The Javan form of this Tern is extremely common in Assam, where it breeds in colonies of many hundreds in the huge swamps of that Province. Nor does it choose only those pieces of water more remote from villages, for one of the largest colonies, numbering probably two thousand pairs, is located in a swamp with Silchar town on one side and villages and cultivated fields on the three other sides. Nests and eggs are like those of the other races but, typically, in this race the dominant colour is brown, whilst in the eggs of C. l. indica it is green. Two hundred eggs average 37.0 x 27.2 mm.: maxima 40.3 X 28.1 and 39.0 X 29.1 mm.; minima 35.0 X 28.0 and 36.0 x 26.2 mm.
These Terns breed principally in July but, if the Rains break early, will sometimes commence laying in the end of May, whilst at other times they do not lay until July and continue well into August.
Habits. Those of the species. It is nowhere, so far as is recorded, even locally migratory in its habits.