Vol. earl Fourteenth Supplement to the A. O. U, Check-List. 389 
IV. PROPOSED ADDITIONS AND CHANGES NOT 
ACCEPTED. 
Gavia vs. Colymbus (c}. Stone, Auk, 1907, 199). A change in 
this case is obviated by the application of Rule 30 of the new Inter- 
national Code, now incorporated into the revised A. O. U. Code. 
Colymbus vs. Podiceps (c}. Sronr, Auk, 1907, 199). The pro- 
posed change is unnecessary, being based on the now obsolete 
“first species” rule. 
Dytes vs. Proctopus (cf. Cours, Osprey, III, 1899, 144). The 
proposed ee is not adopted, since Proctopus is a synonym of 
Dytes. 
Pseuduria Cours (cj. Cours, Osprey, III, 1899, 144.) The 
characters of this proposed subgenus are considered too slight for 
inclusion in the List. 
Megalestris vs. Catharacta (cj. Pocur, Orn. Monatsb., 1904, 23). 
Catharacta has been used for several groups of birds, under various 
spellings, the first use of one of its variants being for a genus of 
Penguins, which renders it unavailable for the present genus 
(cf. ALLEN, Auk, 1904, 345). 
Blasipus, Chroicocephalus, and Hydrocolaus (ef. Couns, Osprey, 
ILI, 1899, 144). These proposed subgenera of Larus are not 
adopted, being chiefly based upon pattern of coloration. 
Subgenus Thalasseus vs. genus [ydroprogne (cj. SAtvin & 
GopmaN, Biol. Centr.-Amer., Aves, III, 1903, 401). Recognition 
as a genus not considered desirable; furthermore, Thalasseus is 
the proper name for the group. (C7. ALLEN, Bull. Am. Mus. N. H., 
XXIV, 1908, 10, 39.) 
Thalassogeron vs. Diomedea (c]. Roruscuitp, Bull. Brit. Orn. 
Club, XV, 1904, 45). No reasons have been offered for the pro- 
posed change. 
Oceanodroma beali Emerson, Condor, VIII, 1906, 54. 
