1878.] THE MARCIL'IS OF TWEEDDALE ON A NEW HORNBILL. 2/9 



The iris of an adult male from the island of Panaon is recorded by 

 Mr. Everett as being "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, 



Fig. 3. 



Side view of head of L'uciros scmigaleafus. 



Head of Buceros setnigaleatvs, from above. 



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

 head, neck, 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 



