348 



BUCEROTIDiE. 



b" . Crest moderate, composed of liairy 



feathers. 



a'". Tail white, with a wide black bar 



across the middle [Size very 



large.] 



«*. Casque large, wedge-shaped, 



elevated, the anterior point 



either nearly straight or re- 



em'ved 2. 



b^. Casque large, subquadrate, con- 

 cave in front, and rising into 

 a square corner on either side 

 at right angles to the culmen . 3. 

 y . Tail white, usuallystained orange 

 or rufous, no black bar across 

 the middle. (Casque large, flat- 

 topped, and boat-shaped.) [Size 



large.] 4. 



c". Crest moderately long, composed 

 of soft feathers ; casque absent or 

 very small and keel-shaped. [Size 



small.] 15. 



V . Chin and throat naked. 



d!' . Casque large and swollen, much 

 like that of Anthracoceros, but less 



compressed laterally 6. 



e". Casque short, elevated in front, 

 smooth or transversely folded, and 

 extending over the skull to above 



or behind the eye 8. 



f'. Casque moderate, compressed, and 

 somewhat elevated, and not ex- 

 tending over the skull 7. 



ff". Casque consists of a series of over- 

 lapping oblique plates, and does 

 extend behind over the skull .... 10. 

 b. Tail wedge-shaped; centre j)air of tail- 

 feathers much longer than the outer 

 pair, 

 e'. Feathers on the lores and on the top 

 of the head not unusually elongate ; 

 tail moderate. 

 h". No naked wattle at the base of the 

 throat. 

 c'". Casque large or very large, sub- 

 crescentic, swollen posteriorly, 

 and extending au inch or more 

 behind the vertical from the eye ; 

 middle of chin and throat 



feathered 5. 



d'". Casque small, keel-shaped ; crest 

 of long feathers. 



BuCEROs, p. 352. 



[p. 355. 



DiCHOCEBOS, 



[p. 357. 

 Hydrocorax, 



[p. 398. 



LOPHOCEROS*, 



[p. 370. 

 Gymnoljeaius, 



[p. 377. 

 Cranobrhinus, 



[p. 371. 

 Penelopide.s, 



[p. 382. 

 Rhytidoceros, 



[p. 361. 

 Anthracoceros, 



* In the somewhat aberrant form Lophoceros hartlauhi the tail is wedge- 

 shaped, the outer pair of feathers being considerably shorter than the centre 

 pair. 



