Allen and Brewster on Colorado Birds. 
[July ■ 
U 8 
ern birds breed. They are not uncommon in Georgia and Florida during 
the winter and early spring, but they apparently depart before the end of 
April. To the northward of the Carolinas in the Atlantic States the 
Orange-crown, of whatever race, is very rarely seen, while the migrants 
that pass up the Mississippi Valley are said to belong to the typical ( cel - 
ala) form. Possibly obscura will be found to summer among the little- 
known mountains of Georgia and the Carolinas. In such a case it will 
probably turn out to be a very local form. 
25. Dendroeca aestiva. Yellow Warbler. — First seen 
May 6 ; they soon became frequent in the town and in the 
willows and cottonwoods of the creek bottoms, and continued 
more or less common. 
26. Dendroeca townsendi? — Three black-throated green 
Warblers were seen on Bear Creek, May 19, which could not 
be certainly distinguished from D. vireiis , but from the known 
range of the two species are more likely to have been D. town- 
sendi. Having no gun at the time prevented their proper iden- 
tification. 
27. Dendroeca coronata. Yellow-rumped Warbler. 
—The first specimen was shot April 25. It afterwards became 
not uncommon, associating with D. auduboni and remaining 
for two or three weeks. 
28. Dendroeca auduboni. Audubon’s Warbler. — First 
seen April 28 — a single male. Afterwards they were seen 
almost daily, and became fairly abundant about May 8, frequent- 
ing the shade trees and gardens of the town, as well as the creek 
bottoms and bluffs. Continued common till about May 16, and 
were last seen May 20. 
29. Dendroeca striata. Black-poll Warbler. — A sin- 
gle one was seen May 8, and one was shot May 9, both at 
Austin’s Bluffs, and the only ones seen. Mr. Aiken regards 
them as of regular occurrence but rare. 
30. G-eothlypis trichas. Maryland Yellow-throat. — 
A single specimen was seen and taken April 13 ; no others were 
seen till May 10, after which they were more or less frequent in 
suitable localities. 
In a recent paper on Arizona birds I called attention to certain pecul- 
iarities in western examples of this species, peculiarities already noted 
by previous writers, but by them regarded as too inconstant to warrant 
the separation of a new race. Since that time, however, I have examined 
a number of additional specimens, and among these the characteristics 
which distinguish western from eastern birds are so well maintained that 
I feel justified in instituting the following variety: — 
