Porzana Vieill., Analy. Nouv. Orn., p. 61 (1816).
Type by mon., Rallus porzana Linn.
The genus Porzana differs from Crex in having the tarsus shorter than the middle toe and claw; the bill is short and fairly stout; the second primary is longest, or the second and third subequal, the first about equal to the sixth or seventh.
The birds of this genus are small and all our Indian species are curiously marked on the upper parts with small streaks of white, looking as if they had been carelessly spluttered on with a brush.
Porzana parva has been generically separated on account of its comparatively longer secondaries under the name of Zapornia but I agree with Blanford in uniting the two genera.
The genus is practically cosmopolitan, three species being found in India.
Key to Species.
A. Breast spotted with white ; wing over 110 mm.…………P. porzana, p. 11.
B. Breast immaculate; wing under 110 mm.
a. Outer edge of primary brown; wing over 94 mm…………P. parva, p. 13.
b. Outer edge of primary white; wing under 93 mm…………P. pusilla p. 14.