Vol XVIII Tenth Supplement to the A. O. U. Check-List. 295 
1901 
TENTH SUPPLEMENT TO THE AMERICAN ORNITH- 
OLOGISTS’ UNION CHECK-LIST OF 
NORTH AMERICAN BIRDS. 
Tue Ninth Supplement to the A. O. U. Check-List was pub- 
lished in January, 1899 (Auk, XVI, pp. 97~133). ‘The present 
Supplement gives a report of the action of the Committee on 
questions affecting the Check-List that have arisen during the 
period from January, 1899 to April, rgo1, and on many of the 
cases deferred for final action at the 1899 meeting of the Com- 
mittee. 
Owing to lack of material, it was found necessary to defer final 
action on many questions, as shown in the subjoined list of de- 
ferred cases. All questions affecting the status of genera and 
subgenera were also deferred. While the Committee has raised, 
in previous Supplements, a number of the groups recognized orig- 
inally as subgenera in the Check-List to the rank of genera, and 
is of the opinion that still others should be thus raised, it seemed 
better to defer this phase of the subject till the whole matter can 
be taken up in its entirety. 
As the roth edition of Linnaus’s ‘Systema Natura 
, 
is adopted 
as the starting point of binomial nomenclature, it is not considered 
necessary to notice the many discrepancies due to the adoption of 
the 12th edition of this work as the starting point, as in Sharpe’s 
‘ Hand-List of Birds’ (Vols. I and II) and elsewhere, nor to con- 
sider cases already settled by the Committee after careful consid 
eration, unless new evidence is brought forward adverse to the 
Committee’s ruling. 
The members of the Committee present at the session were 
Allen, Brewster, Merriam and Ridgway; the session was held in 
Washington, April 10-18, 1901. Much of the work of the Com- 
mittee, however, had been previously apportioned among the 
members, so that nearly all the questions of nomenclature and the 
status of many of the recently described species and subspecies 
had been carefully investigated by different members of the 
Committee in advance of the session, 
As in the previous Supplements, the numbers at the left of the 
