THE BIRDS OF THE NATUNA ISLANDS 57 



Adult male, U.S.N. M. No. 174827, Bunguran Island, July 16, 1900. 

 "Iris red; bill black; toes leaden blue; tarsi tinged with green." 

 Length in flesh, 171 mm. 



Both these specimens are in process of molt of quills and contour 

 feathers. 



The characters assigned by Doctor Hartert ^^ for the separation of 

 this form from Philentoma pyrrhoptera — smaller size and less 

 ochraceous posterior lower parts — are borne out by these specimens; 

 but as the dift'erences are not constant the present form must stand 

 as a subspecies. 



The generic name Philentoma, although consistently used as a 

 neuter noun, apparently must be either masculine or feminine, since 

 its terminal root though a neuter noun is an appelative, and there- 

 fore according to the rule must be masculine or feminine. It seems 

 better to treat Philentoma, on account of its ending, as feminine 

 rather than masculine. 



*RHINOMYIAS UMBRATILIS UMBRATIUS (Strickland) 



Trichostoma umhratile Strickland, Contributions to ornithology, pp. 126-127, 



pi. 35, fig. [2], Nov., 1849. ("Borneo.") 

 Alcippe pectoralis Salvadori, Atti R. Acad. Sci. Torino, vol. 3, p. 530, Apr., 1868. 



(Borneo.). 

 Doctor Hartert has recorded ®^ this species from Bunguran Island 

 under the name Rhinomyias pectoralis.^^ 



•ARIZELOMYIA LATIROSTRIS LATIROSTRIS (Raffles) 



Muscicapa latirostris Raffles, Trans. Linn. Soc. London, vol. 13, pt. 2, p. 312, 

 Nov. or Dec, 1822. ("Sumatra.") 



This species has been recorded by Doctor Hartert ®^ from both 

 Bunguran and Sirhassen Islands, from specimens taken in Septem- 

 ber and October, 1893. 



For the use of the generic name Arizelomyia, consult the discussion 

 of the relationships of this species by the present author.^^ The 

 present species is without much doubt entitled to generic separation 

 from Alseonax. 



HYPOTHYMIS AZUREA GIGANTOPTERA Oberholser 



Hypothymis azurea gigantoptera Oberholser, Proc. U. S. Nat. Mus., vol. 39, p. 

 600, Feb. 25, 1911. ("Bunguran Island, Natuna Islands.") 



This endemic subspecies is interesting as being in color more like 

 Hypothymis azurea prophata of the Malay Peninsula than like 



» Nov. Zool., vol. 1, no. 2, pp. 477-478, Apr. 16, 1894. 

 »< Nov. Zool., vol. 2, no. 3, p. 471, Aug. 17, 1895. 



M For the change of the name of this species from Rhinomuias pectoralis to Rhinomyias umbratilis, see 

 Stone, Proc. Acad. Nat. Sci. Philadelphia, for 1902, p. 686, Jan. 20, 1903. 

 »« Nov. Zool., vol. 1, no. 2, p. 479, Apr. 16, 1894. 

 «' Proc. U. S. Nat. Mus., vol. 28, pp. 910, 911, July 8, 1905. 



