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164 THE CONDOR VoL. XI usually found in small flocks. The greater part of the specimens I referred to P. a. alricapi//us, tho they do not agree closely with eastern specimens. The greater part of them are intermediates, verging toward the western form, seplentriona/is, and in many cases it is difficult to decide where they belong. About eighty per cent can be referred to the eastern variety, and this is apparently the dominant breeding bird. 68. Penthestes atricapillus septentri0nalis. Long-tailed Chickadee. Several birds of this variety were taken, and they appear to be of regular occurrence in this vicinity, as mentioned in the notes under the preceding variety. Ninety skins were made of the two varieties. 69. Regulus calendula calendula. Ruby-crowned Kinglet. On several morn- ings I noticed one or two of these birds feeding in some willows near the tent, and one immature female was taken September 18, 1908. None were taken during the preceding year. 70. Hyl0cichla mustelina. Wood Thrush. One taken September 20, 1907, was the only one seen. The rest had already gone south in the fall migration. 71. Hyl0cichla fuscescens salicic01a. Willow Thrush. Two of these birds were taken, one September 12, and one September 16, 1908. They were found in rather open thickets, one being taken on the side-hill, and the other in the ravine near camp. I have one other specimen in my collection, taken September .28, 1907, in this same locality, and these three constitute the only records for the state to my knowledge. I have been confidently expecting to secure them sooner or later, however, as they have been taken so much further east. 72. Hyl0cichla ustulata swalns0nii. Olive-backt Thrush. A single one taken September 17, 1908, was the only one seen. Thrushes, other than robins, were rare during both years, and only a few w?re taken. 73. Planesticus migrat0rius migrat0rius. American Robin. During 1907 robins were more abundant than the succeeding year, and were found in the thick- ets on the hillsides, and along the creeks. Some of those taken were still in the spotted juvenile plumage, but most of them had almost completed the molt to the adult plumage, some of the birds showing a full winter dress. All those taken the second year were much more advanced in molt, and in better condition than the year previous. 74. Sialia sialis sialis. Bluebird. Common in flocks 'of from six to a dozen along the country roads. These flocks markt family groups, and frequently con- tained spotted individuals and others just molting out of the juvenile plumage. Twenty-five specimens were taken. f?enver, Colorado. CLIFF CLIMBING FOR PRAIRIE FALCON EGGS By GEORGE RICHARDS WITff TWO rffO?OS LIFF climbing can hardly be termed aksport in spite of its many thrills and pleasures. This is especially true when/?e climbers are amateurs and equipment limited. Even when a rare ?r jnters6ng set of eggs leads one to make the attempt, his nerve suffers a queer sen?tion when he looks down the one