BIRDS OF COLORADO. 
85 
Kansas. One was taken by C. E. Aiken, and there are both a 
male and a female in the Maxwell Collection. In 1895, Pres. 
Z. X. Snyder saw one near Greeley. 
412. Colaptes auratus. Flicker. 
Migratory; rare. The eastern form only extends west 
across the plains to the foothills and there is no record of its 
breeding, though a few may winter. Taken by Capt. Thorne 
at Fort Eyons, December 10, 1883, F^of Osburn at 
Loveland during the fall migration, September 24, 1889. One 
was taken by the Pacific Railroad surveying parties on the 
South Platte. 
413. Colaptes cafer. Red-shafted Flicker. 
Summer resident; abundant. Breeds from the plains to 
12,000 feet and is almost as common at 11,000 feet as on the 
plains. An early migrant reaching northern Colorado by the 
first week in April and in mild winters, like that of 1895-6, 
remains all winter throughout the plains region. Even in the 
severest winter a few linger in the State. Eggs are laid from 
the last of May on the plains to the middle of June in the 
mountains. Most of the birds leave the mountains early in 
November, and the State by the first of December. 
418. Phalaenoptilus nuttalli. Poor-will. 
Summer resident ; common. Breeds on the plains and in 
the mountains to at least 8,000 feet, while it has been noted as 
high as 10,000 feet in the mountains of southern Colorado,- 
Arrives about the middle of May and the eggs are laid the latter 
part of June. Remains in the fall until October. 
418a. Phalaenoptilus nuttalli nitidus. Frosted Poor-will. 
Summer resident; rare. In his original description of this 
variety, Mr. Brewster says that Colorado birds are true nuttalli^ 
and this is of course true for the great bulk of the birds all 
over the State. But in southeastern Colorado nuttalli becomes 
mixed with nitidus. Of three specimens taken by Capt. Thorne 
at Fort Lyon, Mr. Brewster marks two as typical nuttalli and 
the other as not typical and nearest nitidus. The latter speci- 
men is now in Mr. Brewster’s collection. As nitidus comes 
north regularly to western Kansas, there is no reason why it 
should not occur in southeastern Colorado. 
420a. Chordeiles virginianus henryi. Western Night- 
hawk. 
Summer resident; abundant. Breeds on the plains and 
up to about 11,000 feet; in the fall wanders to 12,000 feet. 
Is rather more common on the plains and lower foothills than 
