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GENERIC CHARACTERS. 



Genus XV. ACEROS. 

 Head crested. Bill long, rather narrow, tapering to a point. Culmen swollen and slightly 

 elevated at base. Casque none. Maxilla at base ridged, with several transverse grooves. Nude 

 skin around eyes, at base of mandible, and on throat. Wings long; third, fourth, and fifth 

 primaries nearly equal and longest. Tail long, slightly rounded. Tarsi rather short and stout. 

 Toes long, covered with strong scales. 



Genus XVI. HYDROCISSA. 

 Head slightly crested. Bill moderately long, curved, sharply pointed. Casque low, covers 

 the entire culmen to within an inch of the tip of the maxilla, compressed laterally, and indented 

 by three deep grooves for its entire length. Nude skin around eyes. Wings short. Tail rather 

 short, rounded. Tarsi and toes short, stout, covered with strong scales. 



Genus XVII. LOPHOCEROS. 

 Head with a short occipital crest. Bill long, curved, slender, graduated to a sharp point. 

 Nostril round, open, and exposed. A small casque commences at base of culmen, and extends for 

 a little over half its length, terminating in a projecting point. Wings long ; third primary 

 longest; first primary very short and narrow. Tail long, slightly rounded. Tarsi and toes 

 short, stout, covered with strong scales. 



Genus XVIII. TOCKUS. 

 Bill long, slender, much curved ; maxilla compressed laterally along the culmen. N o casque. 

 Wings and tail long, the latter rounded. Tarsi and toes short, stout, covered with rather strong 

 scales. Claws curved, strong, acute. 





