198 Proposed Changes in the A. O. U. Check-List. at 
SECOND ANNUAL LIST OF PROPOSED CHANGES IN 
THE A. O. U. CHECK-LIST OF NORTH AMERICAN 
BIRDS. 
Tus is the Second Annual List of proposed A. O. U. Check- 
List additions and changes in the names of North American birds. 
Like the First,! the present list comprises only ornithological cases, 
— 4. e., such as require specimens or the identification of descrip- 
tions for their determination, and consists of additions, subtrac- 
tions, rejections, and changes of names due to various causes. 
As far as possible the subject is here brought up to December 31, 
1916, and nothing proposed after that date is included. A few mis- 
takes in the First Annual List are now corrected, and some other 
points, notably newly recognized genera, more fully treated than 
space in the previous list would allow. There are, for various 
reasons, a number of omissions in the present list, but it is as nearly 
complete as possible. In the Third Annual List, which will be 
published in the Auk for April, 1918, it is purposed to bring the 
subject up to the close of the calendar year 1917; and thereafter, 
by annual lists, each comprising the ornithological activity of a 
calendar year, to keep the Check-List in this respect up to date.— 
Harry C. OBERHOLSER. 
I. AppiTrions AND CHANGES IN NaMEs. 
Hydroprogne tschegrava imperator (Coues) (cf. Stone, Auk, XX XIII, 
1916, p. 429) should be Hydroprogne caspia imperator (Coues), 
since (Hydroprogne) caspia is the accepted specific name of this bird. 
Thalasseus Boie, Isis, X, 1822, p. 563 (type, Sterna sandvicensis Latham). 
Recognized as a genus (cf. Mathews, Birds Australia, II, pt. 3, 1912, p. 
338; and Oberholser, Proc. U. S. Nat. Mus., XLIX, 1915, pp. 516- 
517). Includes the following North American species now in the genus 
Sterna: 
1 For the First Annual List of Proposed Changes, see Auk, XX XIII, 1916, pp. 425-431. 
It will be understood that these lists cover proposed changes. The A. O. U. Committee 
has not as yet acted upon any of them, but they are presented in order to have them for 
handy reference and use, as well as to invite investigation and discussion. 
