INTRODUCTION. 



c. Tail white, with a broad transverse black band. 



a'. Thighs black . 5. ci 



V. Thighs white 6. albotibialis. 



13. Basal half of culmen covered by a low transversely grooved 



casque-like protuberance XIII. PHOLIDOPHALUS. 



a. Tail with the lateral feathers black tipped with white . 1. fistulator. 



b. Tail with the lateral feathers pure white ...... 2. sharpii. 



c. Tail ? casque highest posteriorly, swollen, corru- 



gated. (Head alone known.) 3. casuarinus. 



14. Base of culmen covered with overlapping scales .... XIV. KHYTIDOCEROS. 



a. Top of head and occiput dark chestnut. 



d. Base of bill grooved laterally 1. undulatus. 



V. Base of bill smooth, without grooves 2. subruficollis. 



b. Head and neck reddish orange. 



a'. Base of bill smooth . 3. ^Meatus. 



V . Diminutive form of above 4 narcondami. 



15. Culmen compressed laterally, elevated into a low crest . XV. ANOBBHINITS. 



a. Tail white 1. comatus. 



b. Tail black, tipped with white. 



a'. Wings spotted with white 2. albocristatus. 



b'. Wings black, without white spots 3. leucolophus. 



c. Tail white, terminal third green 4. galeritus. 



d. Tail greenish black, with pale tips 5. tickelli. 



e. Tail slaty-grey with a greenish gloss, and tipped with 



white . 6. austeni. 



16. Bill without casque; base of maxilla ridged transversely . XVI. ACEBOS. 

 Tail black at base, remainder pure white 1. nepalensis. 



17. Casque low, grooved its entire length XVII. HYDBOCISSA. 



General plumage black ; superciliary stripe, cheeks, and 



throat white 1. exarhata. 



18. Casque low, pointed anteriorly . . XVIII. LOPHOCEBOS. 



a. Bill black, yellow triangular space on base of maxilla . 1. nasutus. 



b. Bill dusky, tips and outlines of both maxilla and man- 



dible whitish 2. birostris. 



19. Culmen compressed laterally, elevated into a low crest, 



sometimes obsolete XIX. TOCKUS. 



a . Bill bright red, base yellow. Head dark brown, streaked 



with white 1. melanoleucus. 



b. Bill yellowish, tip black. 



a!. Two rectrices next to outermost one white for their 



entire length 2. fasciatus. 



xix 



