Z76 Proposed Changes in the A. 0. U. Check-List. [April 



Bull. U. S. Nat. Mus., No. 50, VIII, June 26, 1919, pp. 576-577; 

 Oberholser, Proc. Biol. Soc. Wash., XXXII, Dec. 31, 1919, p. 199.) 

 fLarus occidentalis livens Dwight. New subspecies. Dwight, Proc. 

 Biol. Soc. Wash., XXXII, February 14, 1919, p. 11 (San Jose Island, 

 Lower California). Range: Central California to southern Lower 

 California. 

 Larus brachyrhynchus Richardson becomes Larus canus brachy- 

 rhynchus Richardson, because but subspecifically distinct from the 

 Old World bird. (Cf. Oberholser, The Auk, XXXVI, No. 1, Janu- 

 ary, 1919, p. 83.) 

 i Blasipus Bruch, Journ. fur Ornith., 1853, p. 96 (type, Larus modestus 

 Tschudi). Recognized as a genus (cf. Ridgway, Bull. U. S. Nat. 

 Mus., No. 50, VIII, June 26, 1919, p. 652), to include one North 

 American species now in the genus Larus: 

 Blasipus heermanni (Cassin). 

 | Chroicocephalus Eyton, Cat. Brit. Birds, 1836, p. 53 (type, Larus 

 ridibundus Linnaeus). Recognized as a genus (cf. Ridgway, Bull. 

 U. S. Nat. Mus., No. 50, VIII, June 26, 1919, pp. 635-649) to include 

 the following North American species now in the genus Larus: 

 Chroicocephalus atricilla (Linnaeus). 

 Chroicocephalus franklinii (Swainson and Richardson). 

 Chroicocephalus Philadelphia (Ord). 

 Larus atricilla megalopterus (Bruch) becomes Chroicocephalus 

 atricilla (Linnaeus). (Cf. Ridgway, Bull. U. S. Nat. Mus., No. 50, 

 VIII, June 26, 1919, pp. 636-641.) 

 fHydrocoloeus Kaup, Skizz. Ent.-Gesch. Naturl. Syst. Eur. Thierw., 

 1829, p. 113 (type, Larus minutus Linnaeus). Recognized as a 

 genus (cf. Ridgway, Bull. U. S. Nat. Mus., No. 50, VIII, June 26, 

 1919, p. 649) to include the following North American species now 

 in the genus Larus: 



Hydrocoloeus minutus (Pallas). 

 Sterninae becomes Sternidae, because raised to family rank. (Cf. 

 Ridgway, Bull. U. S. Nat. Mus., No. 50, VIII, June 26, 1919, p. 

 449.) 

 Gelochelidon nilotica aranea (Wilson) becomes Gelochelidon nilo- 

 tica (Gmelin). (Cf. Ridgway, Bull. U. S. Nat. Mus., No. 50, VIII, 

 June 26, 1919, pp. 479-484.) 

 Gelochelidon nilotica (Gmelin) becomes Gelochelidon anglica 

 (Montagu), because Sterna nilotica Gmelin is doubtfully applicable 

 to the species, and its proper name is therefore Gelochelidon anglica 

 (Montagu). (Cf. Hellmayr and Laubmann, Nomenclator Vogel 

 Bayerns, 1916, pp. 29-30.) 

 Hydroprogne caspia imperator (Coues) becomes Hydroprogne caspia 

 (Pallas). (Cf. Ridgway, Bull. U. S. Nat. Mus., No. 50, VIII, June 26, 

 1919, pp. 462-466.) 



