19. RHINOPLAX. 427 



1. Rhinoplax vigil. 



Le Calao a casque rond, Daubent. (ex Edwards, Gleanings, p. 160, 



pi. 281. fig. C) PL Enl. no. 933; B)iff. Hist. Nat. Ois. vii. p. 159 



(1780). 

 Helmet Hombill, Lat/i. Gen. Syn. i. p. 343 (1781). 

 Buceros vigil, Forst. Ind. Zool. p. 40 (1781). 

 Rhinoplax vigil, 2i7//o^, Mon. Bucerot. pi. lO [text] (1877) ; Hume 



^- I)av. S. F. vi. p. 115 (1878) ; Hume, S. F. viii. p. 86 (1879) ; 



Sharjie, Ibis, 1879, p. 248 ; Oatcs, B. Brit. Burmah, ii. p. 89 ( 1883) ; 



Hartert, J.f. O. 1889, p. 366 ; Sharpe, Ibis, 1890, p. 15. 

 Buceros scutata, Bodd. Tabl. PL EnL p. 55 (1783) ; Gray, Gen. Birds, 



ii. p. 399 (1847). 

 Buceros scutatus, SchL Mm. Pai/s-Bas, i. Buceros, p. 1 (1862). 

 Ehinoplax scutatus, Horsf. 4' Moore, Cat. B. Mus. E. Ind. Co. ii. 



p. 581 (1856-8) ; Salvad. Ucc. Borneo, p. 88 (1874) : Hume, Str. 



F. iii. p. 318 (1875). 

 Buceros galeatus, Gm. S. N. i. p. 360 (1788) ; Lath. Ind. Orn. i. 



p. 142 (1790) ; Shaw. Gen. ZooL viii. p. 24 (1811) ; VieilL N. Diet. 



d'Hist. Nat. iv. p. 593 (1816) ; Raffl. Tr. Linn. Sue. xiii. p. 291 



(1822) ; Merrem, Ersch u. Gruber, EncijcL xiii. p. 284 (1824) ; 



War/L Syst. Av. Buceros, no. 4 (1827) ; Less. Traite Orn. p. 257 



(1831) ; Blyth, J. As. Sac. Beng. xvi. p. 998 (1847). 

 Ehinoplax galeatus, Gloger, Hand. u. Hilfsb. p. 335 (1842). 

 Buceroturus galeatus, Bonap. Consp. Gen. Av. i. p. 89 (1850) ; id. 



Consp. VoL Anisod. p. 2 (1854). 



Adidt male. Superciliary feathers and ear-coverts chestnut : lores, 

 top of the head, and crest brownish black ; breast, back, and wing- 

 coveits dark brown, shading into brown on the scapulars, outer 

 secondaries, rump, and upper tail-coverts, many of the last having buff 

 centres ; rest of secondaries and primaries black tipped with white; 

 inner side of shoulders, bases of quills, belly, and rest of underparts 

 white ; centre tail-feathers very long (more than twice as long as 

 the second pair and twice and a half as long as the outer pair), pale 

 brown with white ends, outer pairs white, and all with a black 

 subterminal band : naked skin round the eye, on the throat, neck, 

 down the centre of the back, base of thighs, and underneath the 

 wings Indian red ; iris, legs, and feet the same ; anterior half of 

 bill and front of casque yellow, posterior half of bill and rest of 

 casque deep red like the throat. Total length 63 inches, wing 

 18'5, tail 34, tarsus 3'3. 



Adult female. Differs from the adult male in size only. Total 

 length about 50 inches, wing 16'5, tail about 26, tarsus 2-9. 



Younger birds differ in the shape of the casque, which is rounded 

 in front instead of being abruptly truncated. 



Immature birds without a casque have the basal part of the bill 

 greenish red and the naked parts yellowish (in the skin) ; the basal 

 parrs of the dark-brown breast-feathers are mixed with rufous and 

 many of the least wing-coverts have buff tips ; otherwise the plumage 

 does not differ from that of the adult. 



H(th. S. Tcnasscriin, Malay Peninsula, Sumatra, Borneo. 



