1878.] 



ON A NEW HOENBILL. 



585 



almost parallel lines for about two thirds of the length of the major axis of the casque, and then 

 terminate abruptly, forming corners from which the sides of the remainder of the casque 

 recede until they reach the culmen. 



[S. Leyte, d (adult), September. Iris light yellow; orbital skin darkest sepia, almost 

 black ; gular skin dark Indian-yellow ; feet coral-red ; nails dark hvown-gvey. ^Everett.] 



The iris of an adult male from the island of Panaon is recorded by Mr. Everett as being ^■p;|-y|^^' 



" pale blue." 



Distinct slightly corrugated basal plates are present on the walls of the mandibles of the 



adult birds. 



The first plumage has little resemblance to that of maturity. The space between the rami 

 of the mandible and the patch at the base of the sides of the mandible is dirty brown. The 

 head, neck, breast, and abdomen are dirty greyish fulvous-white, the feathers of the head, neck, 



Fig. 3. 



Side view of head of Buceros semigaleaius. 

 Fiar. 4. 



Head of Buceros semigaleaius, from above. 



and upper breast being ferruginous at their insertions and grey at their tips ; and such is the 

 character of the thigh-coverts and ventral plumage. The upper tail-coverts are also dirty greyish- 

 fulvous white, with either brown or ferruginous bases. The dorsal plumage and the quills and 

 other wing-feathers are brown, the quills dark brown, with broad terminal dirty greyish-fulvous 

 white marks or edgings. The middle pair of rectrices are for two thirds of their length pale 

 brown, the apical third being white or dirty creamy white. All the other rectrices have the 

 basal part to a greater or less extent pale brown, or pale rusty-brown. In some, probably the 

 new feathers, the whole rectrix is white. In the plumage described the bill is black with a p.z.8.1878, 

 yellow tip, and the casque is not formed. The colouring of the soft parts of the young bird P- 280- 

 is noted by Mr. Everett as follows :— " S. Leyte, ? , September. Iris dark brown ; bill black ; 



