SUMMARY OF CHANGES. 381 



Sula ci/anops (Sundevall), 1S38, becomes Sulci dactylatra dadylatra Lesson, 

 1831. 

 On grounds of priority. The specific name has also been repeated as 

 several races have been distinguished and a trinomial form is required. 

 (Cf. Mathews, Novitates ZooL, XVIII, No. 1, 9.) (p. 20) 



Sula has been divided and »S'. hassana referred to Moris, (p. 21) 



Phalacrocorax vigua mcxicanus (Brandt) becomes P. olivaccus mcxicanus 

 (Brandt). 

 On grounds of priority, (Cf. Richmond, Proc. Biol. Soc. Wash., XXXIX, 

 1926, 142.) (p. 23) 



Fregata aquila (Linnaeus^ 1758, becomes Fregata magnificens Mathews, 1914. 

 F. aquila has been divided into a number of forms ours being as above. 

 (Cf. Oberholser, Auk, XXXIV, 1917, 468.) (p. 25) 



Egretta candidissima candidissima (Gmelin\ 1789, becomes Egrcita Ihula 

 thula (Molina\ 1782. 

 Our Snowy Egret of eastern North America proves identical with the 

 South American bird and the name thula, based on the latter, must be 

 adopted on grounds of priority. The western race will stand as E. thula 

 brewsteri. (Cf. A. M. Bailey, Auk, XLV, 1928, 430.) (p. 28) 



Nyciicorax nydicorax nacvius [ Boddaert), 1783, becomes A", n. honcili ( Gmelin), 

 1789. 

 The former name, proposed in the genus Ardca, is invalidated by Ardea 

 nacvia Miller, 1782, and the first available name for our Night Heron is 

 hoactli. (Cf. Peters, Proc. Boston Soc. Nat. Hist., XXXIX, 1930, 265.) 

 (p. 30) 



Olor A\'aglkr, 1832, becomes Cygnus Bechstein, 1803. 



The type of the latter proves to be A7ias cygnus and as it has priority 

 over Olor with the same type it replaces it. (Cf. B. O. U. Comm., List 

 Brit. Birds, 1915, 382.) (p. 36) 



Chen hyperhorea nivalis (Forster', 1772. becomes C. h. atlunHca Kennard, 

 1927. 

 Forster's name is found to apply to the Lesser Snow Cloose and not to the 

 Greater and atlantica is accepted for the latter. (Cf. Kennard, Proc. 

 New Engl. Zool. Club, IX, 1C27, 93.) (p. 41) 



Marila Oken, 1817, becomes Nyroca Fleming, 1822. (p. 50) 



Clangula Oken, 1817, l)ecomes Glaucionetta Stejneger, 1884. 



Oken's names being regarded as nomina nuda, the next available name 

 in each case has been adopted. (Cf. B. O. U. Comm., List Brit. Birds, 

 1915, 384.) (p. 52) 



