Fi 
VIREOSYLVIA. 343 
Smith-|Collec-| Sex When } 
sonian)| tor’s | and Locality. Gollected Received from Collected by 
No. No. | Age ; 
1,016 se od | Carlisle, Pa. May 24, ’43.| S. F. Baird. ajetetelate 
1,017 “ TE Chore ea eee 
10,115 a6 3& | Washington. aie SOM ACE i) aloo WiGe hse 
29,275 | 784 fof oh May 5, ’60. BECOMES! ey VHS Mes io poleter sta 
19,553 93 3 | Fort Simpson. Miya esc 0e eis, chy. O SS.) Joma | sunny ire terelale 
27,035 Selkirk Settlement. Bae Gov, Mactawaslnie |" oil cake ere 
4,729 od | Missouri River. May 9, 757. Lt. Warren. Dr. Hayden. 
5,305 45 Q | Fort Lookout. June 15, 56. r "t 
35,405 |1,905 -. | Evanston, Il. aie Chicago Acad, * F. J. Huse. 
25,240 | ye ver | Cairo; LL sig Jit BELOW Se nda Mlclearclete 
Vireosylvia swainsoni. 
Vireo swainsoni, Bairp, Birds N. Am. 1858, 336 (Pacific coast). 
Vireo bartramiit, Swainson, F. B. A. II, 1831, 235 (in part; spec. from 
Columbia River ?). 
Hab. United States, from Rocky Mountains to Pacific coast. 
(No. 5,$21, *%.) Similar to V. gilva, but smaller; colors paler. Bill more 
depressed. Upper mandible 
almost black. Second quill 
much shorter than 6th. 
(No. 5,521,% .) Total length, 
4.75; wing, 2.71; tail, 2.35; 
difference between 10th quill 
and longest, .58 ; exposed por- 
tion of 1st primary, .58, of 2d, 
1.82, of longest (measured 
from exposed base of Ist pri- . Vireosylvia swainsoni. (California.) 
mary), 2.10; length of bill 
from forehead, .56, from nostril, .29, along gape, .65 ; depth of bill, .13 ; tarsus, 
-70; middle toe and claw, .56; hind toe and claw, .43. 
In the article on Vireo gilvus, in the Pacific R. R. Report (Birds 
N. America), I pointed out certain differences between western and 
eastern specimens, and applied the provisional name of V. swainsont 
to the former. An examination of many additional specimens since 
that time has only tended to confirm the impression of the existence 
of two species, the differences noted, though apparently slight, 
being constant and readily appreciable. In the western bird (V. 
swainsoni) the bill is darker in color, much smaller, and more de- 
pressed, the depth at the base being less than the width, instead of 
being equal to it. The wing is more rounded, the second quill much 
shorter than the sixth, generally shorter or but little longer than the 
seventh. In eastern specimens (V. gilva) the second quill is about 
equal to the sixth. The second quill is about .30 of an inch (or 
more) shorter than the longest in swainsoni, while in gilva it is 
