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 94. THE CONDOR VoL. IX and eggs fully 150 miles west of the Kansas line, unless purely accidental, would seem to indicate the possibility of the birds occurring more or less commonly thruout the eastern half of Colorado; a question which can only be definitely set- tled by extensive and accurate observation. Denver, Colorado. SOME BIRDS OF SOUTHWEST COLORADO By M. FRENCH GILMAN (Concluded) Petrochelidon lunifrons. Cliff Swallow. Common, nesting under eaves of buildings and on cliffs. Down the La Plata River near the New Mexico line I saw several holes in a cliff, containing the swallows' nests. These nests would com- pletely fill the shallow holes, six or eight nests being required to close the entrance of some. Tachycineta thalassina lepida. Violet-green Swallow. Numerous, breeding in holes in the pines. I saw several spirited fights between two birds that wanted the same nesting site. I stood against the tree trunk and watched the birds "lock horns" at the entrance of the hole and slowly flutter and fight, revolving the while till they reached the ground. Several tinms I think I could have scooped them in with a butterfly net. Lanius ludovicianus excubitorides. White-rumped Shrike. Several seen at Fort Lewis; common about Cortez. ireo gilvus swainsoni. Western Warbling Vireo. Common. Nests fre- quently seen in alders and cottonwoods near the river. Dendroica astiva. Yellow Warbler. Common, nesting along the river bot- toms. Dendroica auduboni. Audubon Warbler. Common, nesting from 7,500 feet to about 11,000 feet. Geothlypis tolmiei. Tolmie Warbler. Common. Nesting in river bottom and along irrigating ditches. Icteria virens longicauda. Long-tailed Chat. One seen near Durango. Wilsonia pusilla pileolata. Pileolated Warbler. Rather common. Anthus pensilvanicus. Pipit. Arrived April 30, soon leaving for higher alti- tudes. July 22 I saw two pairs in a ten-acre patch of blue columbine (Aquz'legra coerulea) at an altitude of over 12,000 feet. From their actions I judged a nest was near; but patient search failed to reveal it. Cinclus mexicanus. Water Ouzel. Seen by Mr. Peterson on the La Plata River several miles below Fort Lewis, and also on the Animas River near Durango. 0r0scoptes montanus. Sage Thrasher. Found nesting from Cortez to Navajo Springs, in May and June. lilimus polyglottos leucopterus. Western Mockingbird. Seen only in the vicinity of Navajo Springs where one nest was found and five or six pairs of birds seeI1. Galeosoptes carolinensis. Catbird. One seen at Maneos, May 31. Two pairs