104 
BIRDS OF COLORADO. 
561. Spizella pallida. Clay-colored Sparrow. 
Summer resident ; not uncommon. Appears not to be 
common anywhere in Colorado, but is scattered over all of the 
State east of the mountains. Breeds in north-central Colorado 
on the plains and at the base of the foothills, but the southern 
limit of its breeding range in the State has not been satisfact- 
orily determined. V. L. Kellogg shot one in Estes Park August 
10. (Trans. Kans. Acad. Science, XII. 1889-90, 86). This is 
the only record for the mountains and is probably a bird that 
had wandered upward after the breeding season. Arrives the 
last of April and leaves late in September. 
562. Spizella breweri. Brewer’s Sparrow. 
Summer resident; not uncommon. Arrives from the mid- 
dle of April to the first of May. Most common in migration 
the first half of May. Rather more common in the southern 
half of the State. Breeds throughout its range from the plains 
to 8,000 feet. Principally a western species, but Capt. P. M. 
Thorne took it as far east as Fort Lyon. 
566. Junco aikeni. White-winged Junco. 
Winter resident; common. Winters on the plains and in 
the mountains to at least 8,000 feet. The commonest Snowbird 
in the mountains in the winter. According to C. E. Aiken, “the 
first stragglers from the north do not make their appearance till 
about the 5th of October, [this is on the plains of El Paso 
County. In the mountains they do not arrive until late in 
October or early November,] and then in gradually increasing 
numbers till the first of December, when they come in large 
flocks, the last to arrive being the old and fully plumaged males. 
While many of the females and young birds proceed farther to 
the south, the greater number of the adult males winter at 
some point farther to the north than El Paso County, as of the 
whole number seen during the winter only about two-fifths are 
males. Early in February the old birds begin to start northward, 
the general migration being delayed about a month.” Has 
been taken in Colorado as late as April ii. Breeds in northern 
Wyoming. 
567. Junco hyemalis. Slate-colored Junco. 
Winter resident; not common. The typical hyemalis 
comes west to the Rocky Mountains as a rather rare visitor. 
If it is ever common, it is during spring migration from the 
last of March to the middle of April; less common during fall 
migration in November; still less common during the winter 
season. Winters on the plains and in the foothills to 7,000 
feet. During spring migration goes a 1,000 feet higher. Not 
