84 MESSRS. ROBINSON AND KLOSS ON 



STEGANOPODES. 



Dartkks, Coumouants, Pelicans, etc. 



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



1 Tail rounded .. .. .. .. .. ..3 



2 [Bill from gape 4.5 inches or over . . . . Frcgatn aquila. 



JBill from gape 3.7.5 inches or under . . . . Fregato arid. 



„ f Middle tail-feathers not greatly elongate : nostrils not pervious . . . . 4 



(Middle tail-feathers greatly elongate ; nostrils pervious Phaethon iyidicus. 



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



I Size smaller; bill compressed .. .. .. .. ..5 



_ f With nostrils visible . . . . . . . . . . 6 



1 No external nostrils .. .. ,. ., Sula sula 



g (Bill hooked .. .. .. .. .. ..7 



(Bill pointed .. .. .. .. Plotus vielanogaster. 



rj jTail of 14 feathers . . . . . . Phalncrocorax carbo albiventer. 



' I Tail of 12 feathers . . . . . . . . . . . . 8 



„ (Bill (culmen) less than 1.5 inches .. Phalncrocorax javatiicns. 



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



q j Feathering on forehead pointed . . . . Pelecnnus rosens. 



(Feathering on forehead ending in a concave line Pelecanus pJiUippenensis. 



121. Fregata ? aquila (Linn.). 



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

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



Takuapah ; (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, & Duvison, Stray Feathers, vi, 1878. E. O. firant, Fasciculi Malayenses, iii (Birds), 1905. 



B. Miiller, Die Oi-nisder Insel Salanga, 1882. F. Robinson ami Kloss. Rns, 1910-11. 



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



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



JOUEN. NAT. HIST. SOC. SIAM. 



