ae ati ne Supplement to the A. O. U. Check-List. 44] 
Thalassidroma Vigors becomes Hydrobates Boie (Isis, 1822, col. 562; 
type, by subsequent designation [Gray, List Genera Birds, 1840, 
p. 78], Procellaria pelagica Linnaeus), because the latter name is of 
earlier date, and is net invalidated by Hydrobata Vieillot, a word 
with a different classical ending. (Cf. Hartert, Hand-List British 
Birds, 1912, p. 149.) The only North American species is: 
104. Hydrobates pelagicus (Linnaeus). 
Aestrelata Bonaparte becomes Pterodroma Bonaparte (Compt. Rend. 
Ac. Sci., XLII, May, 1856, p. 768; type by subsequent designation 
[Salvin, Cat. Birds Brit. Mus., X XV, 1896, p. 397], Procellaria macrop- 
tera Smith), because the earliest place of publication of both Aestrelata 
and Pterodroma proves to be Comptes Rendus, XLII, May, 1856, 
p. 768, and here Pterodroma has anteriority. (Cf. Mathews, Birds 
Australia, II, pt. 2, July 31, 1912, p. 131.) 
Sula cyanops Sundevall becomes Sula dactylatra Lesson (Voyage 
Coquille, I, April, 1829, p. 494; Ascension Island). (Cf. Mathews, 
Novit. Zool., XVIII, No. 1, June 17, 1911, pp. 9-10.) While Sula 
dactylatra is not with certainty determinable at the original place of 
publication in the ‘Voyage of the Coquille,’ Lesson himself soon 
afterward (Traité d’Ornith., 1831, p. 601) made its identity certain. 
It should, however, date from its first introduction. 
Moris Leach, Syst. Cat. Spec. Indig. Mamm. and Birds Brit. Mus., after 
August, 1816, p. 35 (type by monotopy, Moris bassana [= Pelecanus 
bassanus Linnaeus]). Recognized as a genus, and adopted because 
considered neither a nomen nudum, nor preoccupied by Morwm 
Bolten, although Morus Vieillot, also proposed for the gannets, having 
a termination differing merely in gramrmatical gender from Morum 
Bolten, is thereby invalidated. The name Sulita Mathews (Austral- 
Avian Record, II, No. 7, Jan. 28, 1915, p. 123; type by original desig- 
nation and monotypy, Pelecanus bassanus Linnaeus), proposed in 
place of Moris and Morus, becomes now also a synonym of Moris 
Leach. (Cf. Oberholser, ‘The Auk,’ XXXVI, No. 3, July, 1919, 
p. 417.) The only North American species of this group will there- 
fore now stand as 
117. Moris bassana (Linnaeus). 
Ibididae becomes Threskiornithidae, because the type of the genus 
Ibis proves to be a stork, Tantalus ibis Linnaeus; and the proper name 
for the genus /bis, the type genus of the family, now becomes Thres- 
kiornis Gray. (Cf. Mathews, ‘The Auk,’ XXX, No. 1, January, 
1913, p. 95; Richmond, Proc. U. 8. Nat. Mus., LIII, August 16, 
1917, pp. 580, 636.) 
Herodias Boie becomes Casmerodius Gloger (Gemein. Hand-und Hilfsb. 
Naturg., 1842, p. 412; type by subsequent designation {Sharpe, 
Cat. Birds Brit. Mus., XXVI, 1898, p. 88], Ardea egretta Gmelin), 
because the type of Herodias Boie is, by subsequent designation 
(Gray, List Gen. Birds, ed. 2, 1841, p. 86) Ardea garzetta Gmelin 
