520. Enicurus immaculatus

(520) Enicurus immaculatus.

The Black-backed Forktail.

Enicurus immaculatus Hodgs, As. Res., xix, p. 190 (1836) (Nepal). Henicurus immaculatus. Blanf. & Oates, ii, p. 85.

Vernacular names. Inruidiba gajeba (Kacha Naga).

Description. Forehead, short supercilium and round the back of the eye white ; rest of head, chin, throat, back and wing-coverts black; rump and upper tail-coverts white; tail black with broad white bases and tips, the two outer pairs pure white; tips of greater coverts and bases of quills white forming a broad wing-bar; tips of secondaries white, broadly so on the innermost; below from lower throat to under tail-coverts white.

In many specimens the head and upper back have a faint slaty tinge, but this appears to be purely individual and in no way a geographical variation.

Colours of soft parts. Iris dark brown; bill black; legs and feet white, fleshy white or yellowish white.

Measurements. Wing 85 to 94 mm.; tail 100 to 118 mm.; tarsus 26 to 27 mm.; culmen 16 mm.

Distribution. Sub-Himalayas from Garhwal to Assam, Chin Hills, Burma South to the Malay Peninsula.

Nidification. Similar to that of the Slaty-backed Forktail. It breeds at low elevations in April and May, making a nest quite typical of the genus but generally laying only three eggs. These vary much but are typically pale and rather sparsely marked with bright pale reddish brown. 1 have one clutch with a pale green ground and another which is densely marked all over with small specks of dark reddish brown. Twenty-five eggs average 20.8x15.8 mm.: maxima 21.6x16.0 and 21.2x16.3 mm.; minima 20.0 X15.5 and 20.3 x 15.1 mm.

Habits. Those of the genus. In Assam we found them principally on the larger hill-streams close to the Plains, but where the current was still rapid. They remain below 2,500 feet and are more common below 1,000 feet than above that level.

The Fauna Of British India, Including Ceylon And Burma-birds(second Edition)
Baker, EC S (1922–1930) The fauna of British India including Ceylon and Burma. Second edition. vol.2 1924.
Title in Book: 
520. Enicurus immaculatus
Book Author: 
Edward Charles Stuart Baker
Page No: 
Common name: 
Black Backed Forktail
Black-backed Forktail
Enicurus immaculatus
Vol. 2

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