68 
BIRDS OF COLORADO. 
it occurs over all of North America, it will probably yet be 
taken on the prairies of western Colorado. Arrives about the 
first of May and breeds far north. 
[266. Numenius borealis. Eskimo Curlew. 
Migratory ; rare. There is no reason to doubt that of the enormous 
flocks of this Curlew that pass over western Kansas, some occasionally enter 
Colorado ; but to date there is no certain record of its capture in the State. It 
has been previously listed as a Colorado bird, but the record was based on error.] 
270. Squatarola squatarola. Black-bkllied Plover. 
Migratory ; not common. Passes north through Colorado 
in May and returns in October. More common in fall than in 
spring. It is a bird of the plains below 5,000 feet. There are 
eight recorded instances of its capture at Denver, Loveland and 
Fort Collins, and Mr. C. E. Aiken has taken it several times 
near Colorado Springs. Breeds far north. 
272. Charadrius dominicus. American Golden Plover. 
Migratory ; not common. A few pass in the spring and fall 
over the plains region of Colorado below 5,000 feet. Breeds far 
north. 
273- /Egialitis vocifera. Killdeer. 
Summer resident ; abundant. One of the earliest migrants, 
arriving early in March and remaining until the last of Septem- 
ber and a few much later. Breeds abundantly on the plains 
and at the base of the foothills. Is less common in the mount- 
ains, but is far from scarce up to the pines at about 10,000 feet. 
The eggs are laid from the middle of May to the first of June. 
274. /Egialitis semipalmata. Semipalmated Plover. 
Migratory; not common.. Passes through Colorado on its 
way from its breeding grounds near the Arctic Circle to its 
winter habitation which is sometimes far south of the equator. 
One was shot by Harry Smith at Loveland, May 6, 1890, and the 
specimen is now in the collection of Prof. Win. Osburn. This 
is the only record to date for Colorado. 
281. /Egialitis montana. Mountain Plover. 
Summer resident ; common. . A bird of the plains rather than 
the mountains, but also found in the mountain parks and prai- 
ries up to 8,000 and rarely to 9,000 feet. Is among the earliest 
spring arrivals, reaching central Colorado by the last of March 
to the first week in April. Eggs are laid the latter part of May 
to the middle of June. On the plains the young are hatched by 
the last of June; in the mountain parks newly hatched young 
can be found all through July. Breeds throughout its range. 
Leaves the state in the fall, the latter part of October. Its num- 
ber can be judged by the fact that in one day of August at Fort 
Lyon, Capt. Thorne shot one hundred and twenty-six birds. 
