DUTCH BORNEO-EXPEDITION. 151 
tain-forms, such as Calyptomena Hosei, Cyanops monticola, 
Malacopteron kalulongae, Rhinomyias ruficrissa, Mesolophus 
(Rubigula) montis, Hemixus connectens, Staphidia Everetti, 
Turdinulus exsul and others in the forests of Mount Kenepai 
and Liang Koeboeng, and we may be quite sure now that 
this special ornis of this more elevated zone of Borneo is 
quite the same on all the mountains of the island, and 
that these special forms are represented by closely allied 
forms on the mountains of Malacca, Sumatra and Java, 
Falconidae. 
1. Microhierax fringillarius. 
Falco fringillaris Drap. Dict. Class. d'Hist. Nat. VI, p. 412, pl. V (1824). 
Hierax coerulescens Salvad. Uce. Born. p. 3. 
Microhierax coerulescens Everett, L. B. Born. p. 1865. 
Three specimens from Smitau, another from the Menda- 
lam River (Dr. Nieuwenhuis) and another from the Upper 
Mahakkam (Dr. Nieuwenhuis, winter 1898—99). — Iris, 
bill and feet black. 
Hab. Malay Peninsula, Sumatra, Java and Borneo. 
2. Polioaetus ichthyaetus. 
Falco ichthyaetus Horsf. Trans. Linn. Soc. XIII, p. 136 (1822). 
Poliaetus ichthyaetus Salvad. Uce. Born. p. 6; Sharpe, Ibis 1889, p. 
73; Everett, L. B. Born. p. 183. 
Two adult females from the Sibau River. — Iris chrome- 
yellow, bill leaden blue, cere lemon yellow, inside of mouth 
pale flesh-color, feet bluish gray. 
Hab. South-eastern Asia and the Sunda Islands (Celebes 
included). 
Annotations of Mr. von Berchtold: »Hin gewandter und 
scheuer Vogel. Sein Gesicht und Gehér sind sehr scharf, 
der Flug leicht, doch wenn es sein muss, schnell, gewohn- 
lich aber langsam. Das schneckenférmige Steigen und das 
Schweben ohne sichtbare Kérperbewegung bietet ein schénes 
Schauspiel. Den gréssten Theil des Tages ruht er auf einem 
Notes from the Leyden Museum, Vol. XXI. 
