174 BIRDS OF THE 
Mahakkam. — Iris whitish yellow, in the nestling gray; 
bill pea-green, tip rosy, feet greenish gray. In the spe- 
cimen from the Mahakkam the iris is said to be red. 
Hab. From Tenasserim through the Malay Peninsula 
to Sumatra and Borneo. 
57. Anthracoceros convexus. 
Buceros convecus Temm. Pl. Col. Il, p. 82, pl. 580 (Q) (1882). 
Hydrocissa convera Salvad. Ucc. Born. p. 80. 
Anthracoceros convecus Everett, L. B. Born. p. 162; Sharpe, Ibis 
1890, p. 15. 
Two males and a female from the Sibau River. — Iris 
red in the male, brown in the female, naked space round 
the eye in both sexes white, bill in the male entirely 
white, casque very large, white, black at the base like 
the base of the lower mandible, a broad black band along 
the lower frontal edge of the casque. In the female the 
casque is much smaller, with vertical frontal edge, which 
is black, as also the fore-part of the upper and lower man- 
dible, which latter bears a red patch in front of the black 
basal part; feet in male and female bluish gray. In a half- 
grown specimen the iris is gray, the naked parts of face 
rosy white, bill pale yellowish green, feet bluish gray. 
Hab. Malay Peninsula, Nias, Sumatra, Java and Borneo. 
58. Anthracoceros malayanus. 
Buceros malayanus Raff, Trans. Linn. Soc. XIII, p. 292 (1822). 
Hydrocissa malayana Salvad. Ucc. Born. p. 83. 
Anthracoceros malayanus Everett, L. B. Born. p. 162; Sharpe, Ibis 
1890, p. 16. 
Hydrocissa nigrirostris (Q) Salvad. Ucc. Born. p. 84; Vorderman, 
Natuurk. Tijdschr. Ned. Ind. LI, p. 218 (1891). 
An adult male (N° 293) from Roema Manoeal with 
white, very strongly developed bill and casque, and with 
strongly developed pure white superciliary stripe; further 
a second adult male (N° 1210) from Nanga Raoen, and 
another N° 184 (Dr. Nieuwenhuis) from Long Bloe (Upper- 
Mahakkam) with bill and casque white but with ashy gray 
Notes from the Leyden Museum, Vol. XXI. 
