THE BIRDS OF SOUTH-WEST AND PENINSULAR SIAM. 75 



CICONIIDAE. 



Stokks. 



J I Mandibles sepamted in middle .. .. .. Anantonms oscitan.i. 



\ Mandibles normal . . . . ■ • • • • • . . 2 



2 I Top of head with a bony cap, unfeathered . . . . . . . . 3 



JTop of head without a bony cap, variably feathered . . . . . . 4 



[Larger, with a gular pouch ; wing 30 inches or over . . LejJtnjjfiliii (hihin. 

 3-, Smaller, without a gular pouch ; wing 27 inches 



( or under .. .. .. .. Leptoptilm jnvamca. 



. (Bill straight, crown feathered .. .. .. •• ..5 



(Bill decurved, crown naked .. .. •• •• ..6 



^ (Feathers of the neck white, silky . . Dhmmra epincopiis neglecta. 



'^ I Feathers of the neck black, nornial . . Xennrhynchm asiaticna. 



/Larger, secondaries rosy in adults, 

 „ wing-coverts black and white . . . . PseudotantaUm leHcocephalus. 



: Smaller, secondaries with no rosy Hush, 

 i wing-coverts white . . . . Psfudotantalus lactem.* 



95. Leptoptilus dubia (Grn.)- 



Ardea dubia, Gmelin, Syst. Nat. i, 1788, p. 624 (India and Africa). 



Leptoptilus argala, C. ii, p. 262 (Tenasserim). 



Leptoptilus dubia, G., p. 152 (Ratburi and Petchaburi) ; I., p. 141 

 (Ratburi). 



We have seen no specimens of the larger Adjutant Bird from 

 the Malayan area or from Peninsular Siam, and doubt if it occurs 

 south of Ratburi. In life it can be distinguished by the possession 

 of a gular pouch, by its much larger size, and by having a grey band 

 across the secondary coverts in breeding birds, nob a coppery red one 

 as in L, javanica. The species is said to occur in Java, but the 

 identification appears to rest on skeletons and skulls. 

 96. Leptoptilus javanica (Horsf.). 



Ciconia javanica, Horsfield, Trans. Linn. Soc, xiii, 1821, p. 188 



(Java). 

 Leptoj)tilu8 javanicus. A., p. 469 (Pakchan) ; 1., p. 141 (Koh Lak) ; 



L., p. 92 (Junk Seylon). 

 Leptoptilus dubius F., p. 16 (Trang). 



Common throughout the area, generally in rice fields, in man- 

 grove swamps and on the coastal flats. 



*lncluded in the key in the possible event of its occurrence in the area. 



I. GyldonstoliMi, Kungl. 8v. Vet. Akad. Handl. M. Baker, Journ. N. H. Soc. Siam, iii. 1919. 



56, No. '2. 1916. <ttrst part). 



J. Robinson, Journ. F. M. S. Mus. vii, 1917. Baker. Journ. X. H. Soc. Siam. iii. 1919. 



K* Kloss. Ibis, 1918. (second part); 



I- Robinson and Kloss, Journ. N. H. Soc. SiK.-a. M.I. Baker, Journ. N. H. Soc. Siam. iv. 1920. 



iii. 1919. (third part). 



VOL. V, NO. 1, 1921. 



