50 
BIRDS OF COLORADO. 
as May 15, 1874. Its nest has been taken at Loveland, with 
fresh eggs June 20, and it is not uncommon on the lakes and 
reservoirs in the Big Thompson and Cache La Poudre Valleys. 
A few pass across the State and enter Kansas. 
6. Podilymbus podiceps. Pied-billed Grebe. 
Summer resident, rare; in migration, common. The only 
records of breeding come from the vicinity of Loveland, though 
it probably will be found breeding over much of the northern 
third of the State below 7,000 feet. In the southern portion 
of Colorado it is known only as a migrant, but in open seasons 
a few may remain through the winter. 
7. Urinator imber. Loon. 
Found throughout the State as a migrant and occasionally 
in winter, but not so common as in most of the country farther 
east. It has not been known to breed in Colorado, and proba- 
bly all leave the Slate for their northern breeding grounds. 
37. Stercorarius parasiticus. Parasitic Jaeger. 
Breeds at the far north and comes south to Colorado as a 
rare visitant in fall and winter. Three cases have been re- 
corded. One, in Mrs. Maxwell’s collection, was taken at Boul- 
der in December, some time previous to 1874. A young bird in 
the dark phase was shot at Sloan’s lake near Denver during the 
fall of 1889. (H. G. Smith, Nidologist, III. 1896, 48.) 
Mr. W. P. Lowe, of Pueblo, writes that one was secured 
on the Arkansas River a mile below Pueblo in the fall of 1894, 
and is now in his collection. 
40. Rissa tridactyia. Kittiwake. 
A northern species, rare or accidental in Colorado in the 
winter. The only known specimen is the one in Mrs. Max- 
well’s collection, which was taken at Boulder in December. 
49. Larus occidentalis. Western Gull. 
A Pacific Coast bird; accidental in Colorado. The only 
record for the State is the one Prof. Win. Osburn writes that he 
took at Loveland, September 30, 1889. 
51a. Larus argentatus smithsonianus. American Her- 
ring Gull. 
Inhabits the whole of North America and occurs rarely in 
Colorado during migration. One was seen for several days by 
Mr. Breninger, near Fort Collins, and a young bird was shot at 
Denver, November 17, 1883. (Auk, III. 1886, 284.) 
53. Larus californicus. California Gull. 
A western species that has been found breeding in immense 
numbers in Utah and has also been once taken in Kansas. It 
