9. ACKROS. 381 



Blyth,lbis, 1866, p. 350; Jenl Ibis, ]87l>, p. o; Bhith, Cat. 

 Mamm. B. Burma, p. 69 (1875) : Gammie, 8tr. F. iii. ji. 210 (1875) ■ 

 Elliot, Mon. Bucerof. pi. 45 [textj (1878) ; Hume S,- fjav. Sir F 



V^J' -^^^ *.^^"^^ ' '^''''"^- ^- ^- '^'- ^^'^^' P- -'51' Beddard, P. Z. S. 



Ib89, p. o88, fig. 3; Oates, ed. Humes Nests ^- Egos hid. B. iii. 



p. 77 (1890). 

 Calao (Aceros) nepalensis, Bonap. Consp. Gen. Av. i. p. 90 (1850). 

 Rhyticeros (Aceros) nepaleusis, Bonap. Consp. Vol. Anisod v 3 



(1854). - F- 



Biiceros (Aceros) nepalensis, TickeH, Ibis, 1864, p. 182 ; Dubois 

 Bull. 3fiis. Belt/, iii. -p. -209 [1884:). ' 



Aceros leucostigma, Salvad. Ann. Mus. Genov. (2) v. p. 515 (1887). 



Adult male. Head, neck, mantle, and underparts, except under 

 tail-coverts, rufous-chestnut, palest on the head and chest, darkest 

 oa the belly and flanks ; wings, back, rump, tail-coverts, and basal 

 half of tail black, with bright dark green gloss ; ends of five middle 

 primaries and rest of tail white : naked skin round eye, at base of 

 lower mandible and posterior part of gular patch blue,'rest of throat 

 red ; ins reddish brown ; legs and feet black (B. H. Hoch/sou) ; bill 

 yellowish white, the basal part of the maxilla with several (seven 

 in old examples) obliquely transverse ridges separated by subquad- 

 rate black grooves. Total length 43 inches, wing IT'S, tail 17-4, 

 tarsus 2'5. 



Totin;/ male resembles the adult, but the ends of the tail-feathers 

 are tipped with black, and there are no ridges on the base of 

 the upper mandible ; after the first moult, when there are one or 

 more ridges developed, three or so of the outer primary-coverts come 

 in mixed with white ; this character disappears in older birds. 



Adult female. Whole of the plumage black except the ends of the 

 middle primaries and the terminal two-fifths of the tail ; the back, 

 rump, tail-coverts, wings, and basal part of tail glossed with dark 

 green : bill as in the male (B. H. Hodgson). Total length 42 inches, 

 wing 17, tail 16-7, tarsus 2-b. 



In an immature female with only two ridges on the base of the 

 upper mandible, the thighs and "belly are mixed with rufous- 

 chestnut, as in the male. 



Hah. S.E. Himalayas, Hills Assam, Manipur and Cachar ; Te- 

 nasserim Prov. [ilooleyit]. 



a-r. S 2 ad. et Sikhim, Feb., Mar., April, May, Hume Coll. 



imm. sk. Aug., Sept. (i. Manddli). ' 



s-z. S 2 ad. et Darjeeling, April, Mar. Hume Coll. 



imm. sk. 

 a\ b'. d' 2 ad. sk. Darjeeling, Mav. Tweeddale Coll. 



c-8. S 2 <id. et Nepal {B. H. Hodgson). 



imm. sk. 

 i. 2 imm. sk. X. Cachar Hills. Major ILILGodwin- 



, „ Austen [P.]. 



u . Bones of 6 Nepal. B. H. Hodgson, Esq. 



J"^- [P.]. 



