



Adult Male.— Bill and casque white, the latter about equal in height to the bill. Posterior 

 margin of casque hidden by feathers, black. The casque projects back over the head from the 

 base of the maxilla, and curves forwards for about two thirds the length of the bill, terminating 

 in an abrupt angle, the upper end inclining forwards nearly to a point ; it is broadest at the 

 posterior margin, and much compressed anteriorly. In some specimens a broad white superciliary 

 stripe begins just forward of, and above, the eye, and extends to the occiput. Rest of plumage jet- 

 black, with the exception of about three inches of the tips of the lateral tail-feathers, which are 

 white. Bare space around the eye blue. Total length 30 inches, wing 13, tail 13, tarsus If, bill 

 along gape 5f , height of bill and casque at base 5 i, length of casque 5 J. 



Female. — The bill and casque black, the latter moderate in size, and terminating abruptly 

 anteriorly. A broad white stripe in some examples commences at the base of the casque, goes 

 above the eye, and extends to the occiput. Rest of plumage jet-black, with the exception of the 

 tips of lateral tail-feathers, which are white. Bare skin around the eyes livid ; iris greyish brown. 

 Total length 24 inches, wing 12, tail 12, bill along gape 5, length of casque 2|, height of bill and 

 casque 2-|. 



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