Butorides Blyth, Cat. Birds Mus. As. Soc. Beng., p. 281 (1852).
Type by mon., Butorides javanica Horsf. & Moore.
In the genus Butorides there is no nuptial plumage; the tibia is feathered nearly to the joint; the tarsus is comparatively much shorter than in the preceding genera and the feet are smaller and more slender; the middle toe and claw are about equal to the tarsus but much shorter than the culmen; the head is furnished with a crest; the scapulars and interscapulars are long and lanceolate but not disintegrated; there are twelve tail-feathers.
The genus extends through Asia, Africa and America, one species only being represented in India.
Ardea striata Linn., Syst. Nat,, 10th ed.,i, p. 238 (1758) (Surinam)
Differs from the Indian form in having the fore-neck and upper breast strongly marked with rufous. A few Malayan birds show a faint trace of this rufous, but for which I should have given our bird javanica full specific status.
Key to Subspecies.
A. Lower plumage paler, more grey, less slaty……………B. s. javanicus, p. 357.
B, Lower plumage darker and more slaty-grey ……………B. s. spodiogaster, p. 359.