THE BIRDS OF THE NATUNA ISLANDS 6 



1908. Parrot, Carl: tlber eine Vogelsammlung aus Siam und Borneo. Verh. 

 Orn. Gesellsch. in Bayern, Band 8, pp. 97-139, Nov. 14. 



1910. VAN OoRT, Eduard Daniel: On Arachnothera longirostra (Latham). 



Notes Leyden Mus., vol. 32, no. 4, pp. 194-196, Dec. 30. 



1911. Oberholser, Harry C: A monograph of the flycatcher genera Hypothymis 



and Cyanonym-pha. Proc. U. S. Nat. Mus., vol. 39, pp. 585-615, Feb. 25. 



1911. Hesse, Erich: Neue Spechtformen. Orn. Monatsb., vol. 19, no. 11, pp. 



181-184, Nov. 



1912. : Kritische Untersuchungen iiber Piciden auf Grund einer 



Revision des im Koniglichen Zoologischen Museum zu Berlin befind- 

 lichen Spechtmaterials. Mitt. Zool. Mus. Berlin, Band 6, Heft 2, pp. 

 133-261, June. 



1912. Stresemann, Erwin: Ornithologische Miszellen aus dem Indoaustra- 



lischen Gebiet, I. Nov. Zool., vol. 19, no. 2, pp. 311-351, Dec. 21. 



1913. : Ornithologische Miszellen aus dem Indo-Australischen Gebiet, 



II. Nov. Zool., vol. 20, no. 2, pp. 289-324, June 17. 



1913. : Die Vogel von Bah. Nov. Zool., vol. 20, no. 2, pp. 325-387, 



June 17. 



1914. : Die Vogel von Seran (Ceram). Nov. Zool., vol. 21, no. 1, 



pp. 25-153, pis. 3-5, Feb. 25. 



1914. : Was ist CoZZocoZia/ucip/ia^o (Thunb.)? Verh. Orn. Gesellsch. 



in Bayern, Band 12, Heft 1, pp. 1-12, May 15. 



1915. Oberholser, Harry C.: A synopsis of the races of the crested tern, 



Thalasseus bergii (Lichtenstein). Proc. U. S. Nat. Mus., vol. 49, 

 pp. 515-526, pi. 66, Dec. 23. 



1917. : The birds of the Anamba Islands. U. S. Nat. Mus. Bull. 98, 



vi + 75 pp., 2 pis., June 30. 



1918. Hartert, Ernst: [Forms of Dicaeum trigonostigma.] Bull. British Orn. 



Club, vol. 38, no. 234, pp. 73-75, May 22. 



1919. Oberholser, Harry C: A revision of the subspecies of the white-collared 



kingfisher, Sauropatis chloris (Boddaert). Proc. U. S. Nat. Mus., 

 vol. 55, pp. 351-395, May 2. 

 1919-1920. SwANN, Harry Kirke: A synoptical list of the Accipitres, vi + 164 

 pp. 



1920. Hartert, Ernst: Types of birds in the Tring Museum; B. Types in the 



general collection. Nov. Zool., vol. 27, no. 2, pp. 425-505, Nov. 15. 

 1921-1922. Swann, Harry Kirke: A synopsis of the Accipitres, 2d ed., viii-f 



235 pp. 

 1928. Chasen, F. N., and Kloss, C. Boden: On a collection of birds from the 



Anamba Islands, South China Sea. Journ. Malayan Branch Roy. 



Asiatic Soc, vol. 6, pt. 3, pp. 43-63, Aug. 

 1931. : Two new Malaysian subspecies of birds. Nov. Zool., vol. 36, 



no. 2, p. 279, Apr. 22. 



PHYSIOGRAPHY 



The Natuna Islands are situated in the South China Sea, northwest 

 of Borneo, between longitude 107° 30' and 109° 20' E. and latitude 

 2° 10' and 4° 50' N. From Point Api, the northwestern extremity 

 of Borneo, these islands extend in a northwesterly direction for some 

 200 miles. They comprise a few main islands, Avith numerous islets 

 and rocks, and fall naturally into two main groups, a southern and 

 a northern. Of the former, Sirhassen (or South Natuna), Subi, and 



