BIRDS OF CODORADO. 
II5 
by the middle of May. Breeds from the northern United States 
northward. Much less common during fall migration. 
656. Dendroica auduboni. Audubon’s Warbler. 
Summer resident; abundant. During the summer this is 
the most common Warbler among the higher mountains. Ar- 
rives on the plains early in May and in migration is very com- 
mon at the western edge of the plains and less and less common 
eastward to western Kansas. Is known on the plains only as a 
migrant. Extends into the mountains the middle of May and 
by the last of the month has reached the upper limit of its 
range. Breeds from 7,500 to 11,000 feet and is most common 
above 9,000 feet. Laying begins from the last of May in south- 
western Colorado to the middle of June in the north-central 
part of the State. The last leaves the plains for the mountains 
the last week in May. Begins to return in August; during Sep- 
tember is common in the lower parks and appears on the plains. 
Leaves the State in October. 
657. Dendroica maculosa. Magnolia Warbler. 
Migratory ; rare. In migration extends westward to the 
western edge of the plains, where one was taken by Henshaw 
at Denver May 17, 1873. Capt. P. M. Thorne has also taken 
one at Fort Lyon May 17, 1884. Breeds in the northern 
United States and northward. 
658. Dendroica rara. Cerulean Warbler. 
Migratory; rare. The only Colorado record is the one 
seen by Henshaw at Denver May 17, 1873. eastern species 
common in Kansas during migration and rarely breeding in that 
State. 
[659. Dendroica pensyivanica. Chestnut-sided Warbeer. 
One was taken by Mr. Bond at Cheyenne, Wyo., May 23, 1889. (Auk, 
VI. 1889, 34 r.) This is only just over the line from Colorado, and the bird, 
which is a common species a little farther east, may have crossed Colorado or 
may have passed westward up the Platte River.] 
661. Dendroica striata. Black-poll Warbler. 
Summer resident; rare. An eastern species coming rarely 
but regularly west to the Rocky Mountains. Occasionally com- 
mon in migration, both on the plains and at the base of the foot- 
hills. The only record of breeding in Colorado, and the most 
southern in the United States, is that of H. D. Minot who found 
it as a summer resident at Seven Lakes, near Manitou, at an alti- 
tude of 11,000 feet. (B. N. O. C. V. 1880, 223.) Reaches 
Colorado about the middle of Mav. 
664. ' Dendroica graciae. Grace’s Warbler. 
Summer resident; common in extreme southwestern Colo- 
rado. A southwestern species reaching its extreme northern 
