594 MR. F. E. BEDDARD ON THE [DcC. 3, 



this group of Hornbills may be regarded as a distinct generic type — 

 Bycanistes. I am also inclined to think that Toccus is a distinct 

 genus ; it may he that the African forms are really distinct from 

 the Asiatic ; but this is a matter that requires further study. 



Col. Tickell^ has separated Aceros and those Hornbills such as- 

 Toccus which are without casques from the other Indian Hornbills, 

 and has remarked that the two genera, which he terms Aceros and 

 Buceros respectively, have a different mode of flight. 



Aceros, however, in my opinion should not be generically separated 

 from Buceros, the anatomical differences between the two genera 

 being so extremely slight. 



Ceratogymna and Sphagolohus have a syrinx which differs in the 

 non-fusion of the last tracheal rings from the syrinx of Buceros and 

 particularly of Aceros, where the fusion between these rings is greater 

 than 1 have observed in any other Hornbill. But this peculiarity, 

 as also in the case of Toccus and Bycanistes, is correlated perhaps 

 with the small size of the birds. 



2. On the Anatomy of Bui'meister's Cariama [Chunga 

 burmeisteri) . By Frank E. Beddaku, M.A.j F.R.S.E., 

 Prosector to tlie Society. 



[Eeceived October 31, 1889.] 



Introductory. 



The specimen which forms the subject of the present paper was 

 acquired by the Society in 1887 and died in 1888, being the fifth 

 example^ which the Society has obtained. 



The bird itself was discovered only thirty years ago (in 1859) 

 by Dr. Burmeister, and was first described by Dr. Hartlaub^ in the 

 ' Proceedings ' of this Society. This description is confined to the 

 external characters, and to au interesting account, from Dr. Bur- 

 meister's notes, of the habits of the bird. It is considered by Hart- 

 laub to present differences of subgeneric value from Cariama cristata. 

 Reichenbach afterwards* placed it in a separate genus, a proceeding 

 which is approved of by Mr. Sclater '. A figure of the bird ® 

 illustrates Mr. Sclater's note which has just been referred to. 



Later Dr. Burmeister ^ gave a somewhat fuller account of its 

 external characters, agreeing with Reichenbach in distinguishing it 

 generically. 



Dr. Gadow has given " some account of the visceral anatomy of 



^ Birds of India (MS.) ; this work is in the Society's Library. 

 2 Sclater, P. Z. S. 1887, p. 319. 



^ " On a new form of GraUatorial Bird nearly allied to the Cariama {Dicho- 

 lophics cristatus)," P. Z. S. 1860, pp. 335-6. 



■* Die voUstandigste Naturgeschichte der Tauben, etc. p. 159. 



' P. Z. S. 1870, p. 666. 



^ Loc. cit. pi. sxxvi. 



■'' Reise durch die La Plata-Staaten, Bd. ii. p. 506. 



^ Joiu-n. f. Ornith. Jahrg. xxiv. (1876) pp. 445-6. 



