112 BIRDS OP TENASSERIM. 



gape, straight to point, 7 '6 to 8*5 ; bill from posterior margin 

 of casque along casque and culmen to point, 8'5 to 9"4 ; height 

 of upper mandible and casque, at middle of casque, 1*75 to 

 2*05 ; weight, 5 to 6 lbs. 



Females. — Length, 33-0 to 36*5 ; expanse, 54'0 to 570; tail, 

 10-2 to 12-0 ; wing, 16-0 to 17'6 ; tarsus, 2-05 to 2-36 ; bill from 

 gape, straight to point, 5*8 to 6 - 85 ; from posterior margin of 

 casque along casque and culmen to point, 625 to 7*2 ; height 

 of upper mandible and casque at middle of casque, 1 - 51 to 

 1-81 ; weight, 375 to 4-4 lbs. 



The legs and feet dusky plumbeous blue to blackish ; the 

 i rides pale red. In one specimen, a middle-aged female, 

 the irides were orange yellow ; the orbital skin pink ; the 

 gular skin in the male bright saffron yellow, in the female 

 smalt blue, sometimes more or less mottled with yellow, 

 and both sexes with the imperfect blackish transverse 

 baud already referred to. The bills are precisely similar as 

 regards general color and plications to those of subruficollis, 

 but the adults have at the sides of both the upper and lower 

 mandibles towards their base, several, at times as many as seven, 

 narrow wrinkle-like ridges, and the whole space over which 

 these wrinkles extend is more or less tinged with brownish red. 

 In the youngest birds, with only two plaits to the casque, there 

 is only one such wrinkle on the sides of the mandibles, with 

 traces of a second. None of our numerous specimens exhibit 

 more than seven plaits on the casque. 



The plumage precisely resembles that of subruficollis, and 

 need not be particularly described ; but I would notice that two 

 of the females of the present species exhibit large irregular 

 black patches on the exterior tail feathers ; these are not 

 young birds, as one has six, and the other five, plaits on the 

 casque. 



146 ter.— Rhyticeros subruficollis, Blyth. (8). 



(TongTioo, Rams.) Karope ; Amherst; Yea; Oin-a-gwen ; Meeta Myo ; Banka- 

 soon. 



Practically confined to the central portions of Tenasserim 

 proper, but re-appearing in Tonghoo. 



From Moulmein to Tavoy, and in the neighbourhood of 

 these places, this species is common ; south of this only a sin- 

 gle straggler was obtained. Among some forty specimens of 

 Plaitbill Hornbills, shot about Bankasoon and the Pakchan, 

 but one belonged to the present species, while all those shot to 

 the north of Tavoy belonged, with one single exception (already 

 noticed), to the present species. At the same time the present 

 species does not, so far as I know, extend further north than 

 Arracan and Pegu, while undulatus occurs in Sylhet and Oachar. 



