DUTCH BORNEO-EXPEDITION, 169 
The genus Penthoceryx is closely allied to Cacomantis, 
but differs from it in having the barrings on the tail, as 
far as they are present, always placed transversely, i.e. in 
a right angle to the shaft, while in all the species of 
Cacomantis the barrings on the tail-feathers, as far as they 
are present, are placed obliquely, which character it has 
in common with the square-tailed genus Surniculus. 
As to the identity of the species pravatus with Sonnerati, 
I cannot agree with the view of Shelley’s, and prefer to 
keep both species separate. P. Sonnerati is a much larger 
bird than P. pravatus, its wing measuring 5 inches, while 
in the Malayan birds (P. pravatus) the largest specimen 
at hand measures but 4,3 inches. 
45. Cacomantis merulinus. 
Cuculus merulinus Scop. Del. Flor. et Faun. Insubr. II, p. 89 (1786). 
Cacomantis merulinus Salvad. Uce. Born. p. 64; Everett, L. B. Born. 
p. 172; Sharpe, Ibis 1890, p. 10. 
An adult and a young female from Banjok, a Dyak village 
near the great falls of the Mahakkam River (Dr. Nieu- 
wenhuis). —- Iris pale ochraceous, bill dark gray, feet 
gray. 
Hab. South-eastern Asia through the Malay Peninsula 
and the whole Malay Archipelago. 
46. Hierococcya fugax. 
Cuculus fugax Horsf. Trans, Linn. Soc. XIII, p. 178 (1822). 
Hierococcyx fugax Salvad. Ucc. Born. p. 65; Everett, L. B. Born. 
p. 171; Sharpe, Ibis 1890, p. 10. 
An immature male from Mount Kenepai, and three 
males and two females from the Upper Mahakkam. — 
Iris chestnut encircled with white, bill black, lower mandible 
at the base, nostrils and eyelid chrome-yellow, feet sulphur- 
yellow. Males and females quite similar. 
Hab. Whole eastern Asia, Malay Peninsula, Sumatra, 
Java, Borneo and the Philippines. 
Notes from the Leyden Museum, Vol. XXI. 
