4 PICARLAE 
B. BUCEROTIN A: 
KEY TO THE GENERA OF THE BUCEROTINA: 
Al. Anterior part of casque solid; neck, throat and a stripe down the centre 
of the back naked. 
D. Sise large: middle tail-feathers very lone... 1. Genus RHINOPLAX. 
B. Casque hollow; upper part of the neck and middle of the back feathered. 
ho 
. Casque elevated in front and rounded off behind, nearly half the length of bill; 
throat naked. Size large . 2. Genus CRANORRHINUS. 
3. Casque very large, vounded on upper edge, the anterior point either nearly 
straight or recurved ; sides of throat naked, Sise very large. . . . . 3. Genus Buceros. 
4. Casque very broad, subquadrate, covering basal half of culmen, flat, concave 
anteriorly, with the corners turned slightly upwards into mintature horns 
projecting forward ; sides of throat naked. Sizelarge . . . . . . 4. Genus DicHOCEROs. 
5. Casque flat, widest posteriorly, rather pointed anteriorly ; sides of throat 
Maked- Size layge. “= 4 a = eee an 4 eee 2 eens LimRocORsxe 
6. Casque large, subcrescentic, somewhat swollen posteriorly, compressed and 
elevated anteriorly. Middle of chin and throat feathered, Size move or 
lessdavge Bo. 4 be me ow Oe Foe es fos 2 oe On Gens AnTeEicoeenon 
7. Casque large and swollen; a naked wattle at the base of the throat, which ts 
alsoonaked. Viedinunisized ss 0s 7. Genus CERATOGYMNA. 
8. Casque of the males, more or less large, elevated and compressed; females 
without casque, but the base of both mandibles deeply grooved transversally. 
Crest well developed. Chin and throat feathered. Size more or less large. 8. Genus BYCANISTES. 
g. No casque. Base of culmen covered with a series of overlapping plates Throat 
Naked. Sige tarpon | 2 aay 5 fe 2 ee ee) en Pee SO URCIChUSE EN DOCH ROS. 
10. Casque rudimentary; base of the upper mandible transversally grooved, Chin 
and throat naked. Size very large 4. 5 4 + 2 5 = 4 =) 4.) ao. GenusvAcERos: 
11. Casque moderate oy small, keel-shaped, extending over half the culmen, 
highest at its anterior end, whence it inclines gradually backward to the 
base of the bill. Throat naked or feathered. Size moderate . . . . . 1. Genus ANORRUINUS. 
12. Casque moderately elevated, covering the greater part of the culmen, Tail very 
long. Crest of long soft feathers. Size middling . . . . . . . . 12. Genus ORTHOLOPHUS. 
13. Casque moderate, upright. compressed; basal half of bill transversally grooved. 
Chin and throat naked, Size middling oy small. . . . . . . . 13. Genus PENELOPIDES. 
14. Casque low, compressed, and indented by three deep groves for ts entire 
length. Sizesmall . = . 3. » . | «© » = = + « « » « 4. (Genus) RHABDOTORRHINUS: 
15. Bill curved, with a small keel-shaped casque, which ts rarely absent 
(es masutus):S7zesmall 7 2 Se ee ee oe GenticglboPHocmRoss 
16, No casque; bill long, slender, much curved, compressed. Size small . . . 16, Genus ALopuHtus. 
