THE BIRDS OF SOUTH-WEST AND PENINSULAR SIAM. 131 

 BUCEROTiD>E 



HORNBILLS. 



f Central tail feathers much elongated . . . . • • , . 2 



I Central tail feathers not elongated . . . . . • - • • 3 



f Casque small, compressed, crest very full . . . . Berenicornis comafus. 



t Casque large, truncated in front, crest not full . . Rhinoiolci'X vigil. 



{ Casque large and high . . . . . . • • . . 4 



\ Casque small and low . . . . • • ■ • . . 6 



(Casque broad, ending in a double point . . • • Dichoceros bicornis. 



1 Casque compressed, ending in a single point . . . . • • -5 



(Outer tail feathers entirely white . . Anthracoceros coronatus convexus 



(Outer tail feathers only tipped with white . . . . A. albirostris. 



( Casque compressed, smaller .. .. .. ■• •• 7 



(Casque broad, composed of transverse ridges, larger .. .. .. 8 



( Chin and throat naked . . . . . . Anorrhinus cjaleritus 



( Chin and throat feathered .. .. .. Ptilolannus t. ticlxeUi. 



(Bases of mandibles plicated . . . . Rhyiidoceros iinchdatus. 



(Bases of mandibles not plicated .. .. .. R. subruflcollis. 



200. Dichoceros bicornis (Linn.). 



Buceros bicornis, Linn., Syst. Nat. i, 1766, p. 153 (Sunda Straits). 

 Dichoceros cavatus, A., p. 98 (Pakchan ; Bankasoon ; Malewoon). 

 Dicoceros bicornis, B., p. 50 (Junk Seylon) ; D., p. 70 (Patani) ; 

 E., p. 108 (Patani) ; F., p. 35 (Terutau Id.) ; G., p. 150 (Rat- . 

 buri and Petchaburi) ; J., p. 150 (Telibun Id.) ; L., p. 96 

 (Ghirbi). 

 6. Tung Pran, Takuatung, Peninsular Siam, 13 February 

 1919 (No. 3983). 



J, $. Tapli, Pakchan, Peninsular Siam, 2 March 1919 (No. 

 4358, 4360). 



" Iris red ; bill ivory, stained with yellow, more orange at 

 the tip, extremities of casque black, base of lower mandible black ; 

 female with no black on casque ; feet greenish black ". 



Total length 6, 1100, 1155'; 9, 1030; wing 6, 425, 470; $, 

 465; tail, 6 420, 400; 9, 330; tarsus 6,12, 60; 2, 58; bill from 

 gape ?, 247, 212; $, 207 mm. 



- Common everywhere along the coast, especially on certain of 

 the islands. 



I. Gyldenstolpe, Kungl. Sv. Vet. Akad. Handl. M. Baker, Journ. N. H. Soc. Siam, iii, 1919. 



56, No. 2, 1916. (first part). 



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



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



L. Robinson and Kloss, Joui-n. N.H. Soc. Siam, M.I. Baker, Journ. N. H. Soc. Siam, iv, 1920. 



iii, 1919. (third part). 



VOL. V, NO. 2, 1922. 



