Subfamily IX. ERISMATURIN^. 



Keij to the Genera. 



a. Bill about the length of the head; no 

 pendent lobe on the chin ; tail-feathers 

 less than 24. 

 a! . Nail of the bill perpendicular. 



ff". Tail shorter than tarsus 55. Thalassiornis, p. 436. 



h" . Tail longer than tarsus 56. Nomonyx, p. 438. 



b'. Nail of the bill beat inwards ; tail of 



18 feathers 57. Erisxiatura, p. 441. 



h. Bill shorter than the head, very high at 

 base ; a pendent lobe on the chin ; 

 tail-feathers 24 58. Bizixjra, p. 452. 



55. THALASSIORNIS. 



Type. 



Thalassornis, Eyt. Mon. Anat. p. 70 (1838) T. leuconota. 



Thalassiornis, G. R. Gr. Gen. B. iii. p. 626, pi. 169. f. 1 

 (1844). 



Range. Confined to the Southern part of Africa. 



1. Thalassiornis leuconota. 



Clangula leuconotus, Smith, Cat. S. Aft: Mus. p. 37, n. 828 (1837) 



(descr. nulla), tmde : — 

 Thalassornis leuconotus, Eyt. Mon. Anat. p. 168 (Cape of Good 



Hope) (1838) ; Gum. Ibis, 1861, p. 134, 1862, p. 39 (Natal) ; Eijt. 



Syn. Anat. p. 126 (1869). 



