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 THI CONDOR Vol. XVII a board wired in a corner under the floor of a water-tank tower about twenty feet high. The pair of Kingbirds before mentioned as having trouble with the Thrasher, tried to take the nest away from the Wrens, but the owners were too persistent and they gave it up. Last year the Wrens had raised a brood in the same place; after the young had left I tore the nest out and the Kingbirds raised a brood. Hence both factions had some rights, the Wrens the prior right, however, which they made good. Four young were raised here, and on July 8 they were Started on another set of four. After the first brood had flown from the tank I removed the old nqst, and they soon rebuilt. Three eggs of this set hatched, the fourth being infertile. I might say that last year after the young Kingbirds had left the nest, the Wrens built again and lincubated four eggs for three weeks. I then decided that the eggs were infertile, which proved to be the case. Besides the three nests of this pair of -Wrens, five others were found, four in mesquite trees and one in a Zizyphus. Auriparus fiaviceps flayJeeps. Verdin. Three nests in the mesquite thicket, two in Zizyphus shrubs, and one in a mesquite. They seem to breed usually but once a year, though there may be .exceptions. Polioptila phtmbea. Plumbeous Gnatcatcher. One nest in a Zizyphus five feet from the ground, with two Gnatcatcher's and two Dwarf Cowbird's eggs. A total of sixty-six sets was found on the forty acres, representing eighteen species; this not counting the pair of Redwinged Blackbirds which deserted their nest, the Texas Nighthawk of 'which the nest was not found, nor the White-winged Dove, just out of bounds. Sacaton, Arizona, July 25, 1914. SOME PARK COUNTY, COLORADO, BIRD NOTES By EDWARD R. WARREN WITH TWO PHOTOS BY THE AUTHOR SPENT the last two weeks of September, 1914, in the western part of Park County, Colorado, collecting mostly mammals but some birds also, and the notes I made in a comparatively little known portion of the State, and at a season when the migratory movements are on, seem sufficiently inter- esting to be published. Park County covers the geographical center of Colorado, comprises the well known South Park, and is bounded on the' west by high mountain ranges. The place which I made my headquarters, with the exception of the first two days, was Alma, one of the oldest mining camps in the State, at an elevation of 10,235 feet. The first two days were spent at Fairplay, also an old mining camp and the county seat, its altitude being 9,900 feet. It was not very favor- ably situated for the work I wished to do, therefore I moved to Alma, five miles above, and spent the remainder of my time there. To reach these places I took the South Park Railroad, a narrow gauge, from Denver, going up the South Platte River 29 miles, then up the North Fork of the South Platte 40 miles farther to Webster, then climbing Kenosha