(523) Hydrocichla frontalis.
The White-crowned Forktail.
Enicurus frontalis Blyth, J. A. S. B , xvi, p. 156 (1847) (Sumatra). Hydrocichla frontalis. Blanf. & Oates, ii, p. 87.
Vernacular names. None recorded.
Description. Forehead, anterior crown, rump and upper tail-coverts, abdomen and under tail-coverts white; wings black, tips of greater coverts and bases of secondaries white forming a wing-bar, inner secondaries also tipped with white ; tail-feathers black with broad white bases and white tips, the outer two pairs pure white; remainder of plumage black.
Colours of soft parts. Iris brown to black ; bill black, legs and feet almost white.
Measurements. Total length about 220 mm.; wing 85 to 93 mm.; tail 67 to 79 mm.; tarsus 28 mm.; culmen 20 to 21 mm.
Distribution. Sumatra and Borneo extending North through the Malay Peninsula to Siam and the extreme South of Tenasserim.
Nidification. Nothing recorded.
Habits. This is a bird of forests of the plains and lower hills but practically nothing has been recorded as to its habits or even in regard to the elevation to which it ascends. It appears to keep to rivers in evergreen forest and to have the voice, night and action of the commoner Forktails.