Genus — P ROCELSTERNA. 
Procelsterna Lafresnaye, Mag. de Zool., 1842, pi. 29 . . Type P. cerulea. 
(Also spelt Procellosterna Gould, Proc. Zool. Soc. (Lond.) 1845, p. 104, 
and Procellisterna, Ibis 1903, p. 417.) 
Small Noddies with short slender bills, long wings, long tails, and long toes 
fully webbed. 
The tail has the outer rectrix shorter than the second, which is longest, 
but longer than the middle feathers. The middle toe without the claws is 
about the same length as the exposed portion of the culmen and longer 
than the metatarsus. The tail is slightly more than half the length of 
the wing. 
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