Islands of the Coast of Yucatan, S^c. 375 



Rupornis gracilis, Ridgw'. Proc. U.S. Nat. Mus. viii. p. 9-i. 



Rupornis magnirostris gracilis, Ridgw. Proc. U.S. Nat. 

 Mus. viii. p. 578. 



Meco I. ; Holbox I. ; Cozumel I. ; Ruatan I. ; Bonaccal. 



We liave a good many specimens from Cozumel Island, 

 showing, on an average, rather less barring on the thighs 

 than is usual in birds from the mainland ; some, however, 

 are not to be distinguished in this or any other respect. 



The Ruatan Island and Bonacca Island birds are darker 

 than usual, with dark chests and tails, but none of them are 

 in quite adult plumage, so that at present I feel only justified 

 in calling attention to the fact. 



We now possess seventy specimens of this form of Astu- 

 rina or Rupornis from Mexico and Central America, the 

 most northern point reached being Presas de Aldama, near 

 Tampico, in the State of Tamaulipas. 



-^148. Urubitinga anthracina. 



Urubitiuga anthracina (Nitzsch) ; Sharpe, Cat. B. Brit. 

 Mus. i. p. 215 j Salv. Ibis, 1885, p. 193; Ridgw. Proc. U.S. 

 Nat. Mus. viii. p. 581. 



Cozumel I. 



-}-149. Geranospizias nigra. 



Geranospizias niger (DuBus) ; Sharpe, Cat. B. Brit. Mus. 

 i. p. 82. 



Meco I. 



150. Hypotriorchis columbarius. 



Falco columbarius, Linn. ; Sharpe, Cat. B. Brit. Mus. 

 i. p. 408. 



Mugeres I. ; Cozumel I. ; Ruatan I. 



151. Hypotriorchis rufigularis. 

 Hypotriorchis rufigularis (Daud.). 



Falco albigularis, Daud. ; Sharpe, Cat. B. Brit. Mus. i. 

 p. 401. 

 Ruatan I. 



-4-152. Cathartes aura. 

 Cathartes aura, Linn. 



