162 



MR. F. E. BEDDARD ON THE 



[June 16, 



are more or less incomplete, inteivene between that bearing 

 the pessulus and that upon which the intrinsic muscles of the 

 syrinx are inserted. The same is the case with the syrinx of 

 Dryotriorchis ; but the tracheal rings immediately preceding that 

 to which the intrinsic muscles are attached lie well below the 

 pessulus, are joined internally by the membrana tympaniformis 

 interna, and clearly constitute a portion of the bronchi. It will 

 be recollected that in other groups of birds*, some of the members 

 of which possess the bronchinl form of syrinx, the first semirings 

 or rings of the bronchi are tracheal in character, and differ from 

 the ensuing semirings which belong to the bronchi proper. In 

 fact it appears as if the bronchi in the bronchial syrinx were partly 

 formed by a split trachea, and partly by semirings belonging to 

 the bronchi proper. 



The tongue in the Accipitres shows characters which allow of 

 the division of the group into a Falconine and an Aquiline series. 



Text-fig. 19. 



Text-fig. 20. 



Text-fig. 19. — Tongue of Milvago chimango, dorsal aspect. X 2. 

 Text-fig. 20. — Tongue of Oypohierax angolensis, dorsal aspect. X 1|. 



In several species of Falco, in Tinnuncidtts cdaudarius, Hiera- 

 cidea berigora, a,nd Milvago chimaoigo (text-iig. 19), the back part of 



* Owls, Cuckoos, and Goatsuckers. 



