(Bill 

 'I Bill 



84 MESSRS. ROBINSON AND KLOSS ON 



STEGANOPODES. 



Darters, Cormorants, Pelicans, etc. 



J (Tail deeply forked .. .. .. .. •• ..2 



I Tail rounded . . . . . . . . ■ . . . 3 



„ (Bill from gape 4.5 inches or over . . . . Fiegatn aquiln. 



iBill fi'oni gape 3.75 inches or under .. .. Fregata ariel. 



,,( Middle tail-feathers not greatly elongate: nostrils not pervious .. .. 4 



I Middle tail-feathers greatly elongate ; nostrils pervious PhocOion iiidicus. 



. J Size very large ; bill flattened . . . . . . 9 



1 Size smaller ; bill compressed 



_ f With nostrils visible 

 I No external nostrils .. .. .. .. Snla sula 



hooked 



pointed . . , . . . . . Plotus melanogasier. 



-/Tail of 14 feathers . . .. .. Dudacrocorax carho albiventer. 



't Tail of 12 feathers .. .. .. .. .. ..8 



jj /Bill (culmen) less than 1.5 inches .. Phalacrocorax javaninis. 



(Bill (culmen) more than 2.2 inches .. Phalacrocorax fuscicoUis. 



q /Feathering on forehead pointed . . . . Pelecanus rosens. 



(Feathering on forehead ending in a concave line Pelecamis philipiienensis. 



121. Fregata ? aquila (Linn.). 



Pelecanus aquilus, Linn., Syst. Nat. i, 1766, p. 216 (Ascension Id.). 

 Fregata minor, Hume, Stray Feathers, ix, 1880, p. 119 ( Tongka ; 



Takiiapah ; (Langkawi Ids. ). 

 Fregata aquila, B., p. 86 (Junk Seylon). 



? Fregata andreiosi, Mathews, Austral. Av, Rec. ii, 1914, p. 120, 

 Christmas Id.) ; Gyldenstolpe, Ibis, 1920, p. 775. 



We have frequently seen Frigate birds on both coasts of 



Siam, notably in Bandon Bight, but have not obtained .specimens ; 



the smaller species has been obtained in the vicinity of Pulau Tinggi, 



off the coast of Johore. 



Fregata ariel (Gould). 



Attagen ariel, Gould in Gray's Gen. Birds, iii, 1869, p. 669 



(Australia). 

 Fregata ariel ariel, Rothschild, Nov. Zool., xxii, 1915, p. 145. 



It is not profitable to discuss the names for Siamese birds 



in the absence of specimens, and we have therefore not attempted to 



assign to the exact races the two forms that almost certainly occur. 



Reference may be made to Lord Rothschild's article on the Genus, 



A. Hume, & Davison, Stray Feathers, vi, 1878. E. O. Grant, Fasciculi Malayenses, iii (Birds), 1905. 



B. IMiiller, Die Ornis der Insel Salanga, 1882. F. Robinson and Kloss, Ibis, 1910-11. 



C. Oates, Birds Brit. Burmah, Vols. i. & ii, 1883. C. Gairdner, Journ. N. H. Soc. Siam, i, 1915. 



D. Bonhote, P. Z. S. 1901, Vol. i H. Robinson, Journ. F. M. 8. Museums, v. 1915. 



JOURN. NAT, HIST. SOC. SIAM. 



