(2230) Ardeola bacchus.
The Chinese Pond-Heron.
Buphus bacchus Bonaparte, Consp. Av., ii, p. 127 (1855) (Malacca). Ardeola baccha. Blanf. & Oates, iv, p. 398.
Vernacular names. Hbyein-ouk (Burma).
Description. - Breeding plumage. Chin and throat white; rest of head and neck with long crest dark chestnut; back and inner scapulary plumes black, the longer tinged with slaty; lanceolate breast-plumes chestnut, the longest tipped.slaty-black; remainder of plumage white, the first few primaries pale mottly brown on the outer webs and tips.
Colours of soft parts. Iris deep golden-yellow; bill yellow, blackish on the terminal quarter, bluish at the base; orbital skin greenish-yellow; legs and feet yellowish-green, the soles still paler.
Measurements. Wing 195 to 238 mm.; tail 72 to 90 mm.; tarsus 60 to 64 mm. ; culmen 61 to 69 mm.
In non-breeding plumage like A. grayii, rather more brown and buff on the head and neck and rather deeper brown on the back and scapulars.
Distribution. From Eastern Assam, Manipur, Burma and the Malay Peninsula to China and Japan and through the Malay Archipelago to Borneo. It is also found in the Andamans.
Nidification. Very similar to that of the preceding bird, with which it is sometimes found breeding in Eastern Assam and Burma. The eggs are not distinguishable from those of that bird. Fifty eggs average 37.7 x 28.4 mm.: maxima 39.2 x 28.8 and 38.2 x 30.1 mm.; minima 34.0 x 26.7 mm.