INTRODUCTION. 



Type. 



1850. Calao, Bp. (nee Less.) Consp. G-en. Av. p. 90 . . . Buceros cassidix, Temm. 



1850. Hydrocissa, Bp. Consp. Gen. Av. p. 90 Buceros exarhatus, Temm. 



1850. Buceroturtjs, id. ibid. p. 89 Buceros vigil, Eorst. 



1850. Berenecornis, id. ibid. p. 91 Buceros comatus, Raffles. 



1854. Ceratogymna, Bp. Consp. Volucr. Anisod. p. 2 . . . Buceros elatus, Temm. 

 1854. Tmetoceros, Bp. (nee Cab.) Consp. Volucr. Anisod. 



p. 2 Buceros atratus, Temm. 



1854. Homraius, Bp. Consp. Volucr. Anisod. p. 2 . . . . Buceros bicomis, Linn. 



1859. Platyceros, Cab. & Hein. Mus. Hein. p. 174 . . . Buceros planicomis, Merrem. 



1859. Bycanistes, iid. Mus. Hein. p. 171 Buceros buccinator, Temm. 



1859. Sphagolobus, iid. ibid Buceros atratus, Temm. 



1859. Cranorrhtntts, iid. Mus. Hein. p. 173 . . . . . Buceros cassidix, Temm. 



1873. Ocyceros, Hume, Nests and Eggs of Indian Birds . Buceros birostris, Scop. 



1878. Pholidophaltjs, Elliot, Mon. Bucerotidae Buceros fistulator, Cass. 



1882. Limonophalus, id. ibid Buceros montani, Oust. 



Key to Genera and Species. 



1. Casque curving from base of culmen, horn-shaped, opened 



or closed in front I. BUCORVUS. 



a. Casque with large circular opening anteriorly .... 1. abyssinicus. 



b. Casque with small circular opening anteriorly .... 2. pyrrhops. 



c. Casque completely closed anteriorly 3. cqfer. 



2. Casque very large, rounded on upper edge, two thirds 



length of bill II. BUCEROS. 



a. Casque very much turned up anteriorly 1. rhinoceros. 



b. Casque nearly straight on upper edge for entire length . 2. sylvestris. 



3. Casque flat anteriorly, concave, corners turned slightly 



upwards III. DICHOCEROS. 



a. General plumage black and white; tail white, with 



black band on terminal third 1. bicomis. 



4. Casque flat, widest posteriorly, rather pointed anteriorly . IV. HYDROCORAX. 

 a. General plumage chestnut-red and black ; tail white. 



a!. Casque with anterior margin compressed and elevated. 



a". Bill red 1. planicomis. 



b". Bill, apical half white ; tail buff 2. mindanensis. 



b'. Casque anteriorly curving gradually to the culmen . 3. semigaleatus. 



5. Casque solid V. RHINOPLAX. 



a. Median rectrices greatly exceeding the rest in length . 1. vigil. 



e 



xvu 



