EHYTIDOCEROS. 147 



Key to the Species. 



a. Base of both mandibles with transverse 



ridges in adults : wing 17-20 R. undulatus, p. 147. 



b. Base of both mandibles smooth 



a'. Wing 14 to 17 R. subruficottis, p. 148. 



b'. Wing 11 to 12 -R. narcondami, p. 149. 



1054. Rhytidoceros undulatus. The Malayan Wreathed 

 Hornbill. 



Buceros undulatus, Skate, Gen. Zool. viii, p. 26 (]811). 



Buceros plicatus, apud Mutter $ Schleg. Verhandel. pp. 24, 30 ; Blyth, 



Cat. p. 319 ; nee Latham. 

 Buceros ruficollis, Blyth, J. A. S. B. x, p. 922, partim ; xii, p. 176 ; 



nee Vieillot. 



Buceros pucoran, Blyth, J. A. S. B. xii, p. 990. 

 Buceros pusaran, Blyth, J. A. S. B. xvi, p. 998 ; id. Cat. p. 45 ; 



Tickell, Ibis, 1864, p. 180. 

 Rhyticeros plicatus, Horsf. fy M. Cat. ii, p. 598; Godw.-Aust. J. A. 



S. B. xxxix, pt. 2, p. 96 ; Blyth. Ibis, 1866, p, 350 : Jerdon. Ibis, 



1872, p. 5. 



Aceros, sp. indet., Godw.-Ausi. I. c. 

 Rhyticeros obscurus, apud Hume, N. fy E. p. 115 : nee Buceros 



obscurus, Gm. 



Aceros plicatus, Blyth $ Wald. Birds Burm. p. 69. 

 Rhytidoceros undulatus, Tiueeddale, Ibis, 1877, p. 292; Oates, B. B. 



ii, p. 93 ; id. in Hume's N. $ E. 2nd ed. iii, p. 80 ; Elliot, Mon. BUG. 



pi. 35 ; Offileie Grant, Cat. B. M. xvii, p. 382. 

 Rhyticeros undulatus, Hume fy Dav. S. F. vi, p. Ill ; Hume, Cat. 



no. 146 bis ; id. S. F. ix, p. 247 ; xi, p. 52 ; Bingham, S. F. viii, 



pp. 194, 463 ; ix, p. 159. 



Mah-doh-la, Assamese. 



Fig. 42. Head of tf . undulatus, 



Basal portion of both mandibles obliquely, somewhat irregularly 

 ridged at the side, in adults ; the ridges wanting in the young and 

 increasing in number with age. 



Coloration. Male. Forehead, middle of crown, and whole nape 

 deep rich chestnut, passing into black on the hind neck ; sides of 

 head, including lateral portions of crown, sides and front of neck 

 white, more or less tinged with buff ; tail entirely white ; remainder 

 of plumage black, glossed with dark green and purple. 



Bill pale yellow, reddish towards the base, the hollows between 

 the ridges of the casque dark ; irides orange-red ; orbital skin dull 



L2 



