INTRODUCTION. 



XI 



1827. Wagler, Sy sterna Avium. 



All the known species of Buceros are here given, and their synonymy as the author 

 understood it. Proper discrimination regarding the specific value of those enumerated does 

 not appear to have been made, as the errors of previous authors are continued, and the same 

 species in several instances appears under different names. No new ones are added. 



1828. Hemprich and Ehrenberg, Symbolse Physical seu Icones et Descriptiones &c. 



In this work, in footnotes, four Hornbills are mentioned, viz. P. (Lophoceros) HEMPRICHII, 

 named for the first time, B. (Alophius) erythrorhynchus, var. leucojpareus (=erythrorhynchus, 

 Temm.), B. (Lophoceros) hemileucus, and B. (Lophoceros) forskali $ (both =nasutus, Linn.). 

 Species 32. 



1829. Cuvier, Regne Animal. 



Following the edition of 1817, the present one merely gives a short list of the existing 

 species arranged in two groups — those with a prominent casque, and those without. No 

 attempt is made to investigate the validity of the different species given ; and the lists are 

 resumes of those of the authors who preceded Cuvier. 



1831. Lesson, Traite Ornithologique. 



This author places this family of birds in the genus Buceros (Calao) of his Buceridees, 

 including with them the Motmots. He divides the genus into three subgenera — Tockus, 

 Buceros, and Bucorvus. The first comprises three species, erythrorhynchus, nasutus (here 

 called hastatus, Cuv.), and griseus. The second contains melanoleucus, Licht. (called 

 coronatus, Shaw), birostris, Scop, (called ginginianus, Lath.), cassidix, buccinator, mala- 

 baricus, bicornis, planicornis (called hydrocorax, Linn.), leucocephalus (called suleatus, 

 Temm.), undulatus, rhinoceros, sylvestris, and vigil (called galeatus, Gmel.). The third 

 subgenus has only abyssinicus. No species are described as new. 



1833. Hodgson, Asiatic Researches. 



BUCEROS (ACEROS) NEPALENSIS described and figured. Species 33. 



1835-40. Ruppell, Neue Wirbelthiere zu der Eauna von Abyssinien gehorig. 



Three species are here mentioned, and two described for the first time, viz. BUCEROS 

 (BYCANISTES) CRISTATUS and BUCEROS (TOCKUS) ELAVIROSTRIS, B. limbatus 

 (=B. hemprichii, Hemp. & Ehr.). Species 35. 



1843. Blyth, Journal of the Asiatic Society of Bengal. 



In the volume for this year Mr. Blyth separates the bird without any lateral ridges upon 

 the bill as distinct from B. undulatus, Shaw, and names it B. SUBRUEICOLLIS, both 

 species being found in India, the latter, however, apparently restricted to the Tenasserim 



