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 38 THE CONDOR VoL. XII Springs the first day out; near Texas Creek; at Coaldale; north of Villa Grove, between that place and Moffat, at .Hooper, Mosca, San Luis Lake, Medano Ranch, and Westcliffe. Tachycineta thalassina lepida. Violet-green Swallow. Seen practically every- where we went between Parkdale and Beulah, and everything considered the most abundant of the swallows. At Querida, July 30, the swallows were beginning to gather in flocks. At Mosca Creek, birds of this species were seen entering 'old woodpecker's holes in aspen trees, and no doubt had nests there, as they often use them. Lanius borealis. Northern Shrike. One seen at Mosca, January 19, 1908. Lanius ludovicianus excubitorides. White-rumped Shrike. Seen quite com- monly from a little above Moffat to Mosca; it was .at San Luis Lake, where Durand saw  grown young June 20, and was also at Medano Ranch. Seen at Westcliffe, near Beulah, and between Pueblo and Buttes station. Vireosylva gilva swainsont. Western Warbling Vireo. Taken at Van Andert's Spring, Glendale, Howard, Durkee Ranch, and seen at Mosca Creek. Dendroica aestiva. Yellow Warbler. Seen at Glendale, near Cotopaxi, Howard, Poneha Springs, Villa Grove, and at Durkee Ranch. Dendroica auduboni. Audubon's Warbler. Taken near Poncha Pass, seen on Madenos Creek, and on Muddy Creek. A female seen on Madenos Creek, at about 10,000 feet elevation, July 11, acted in a very disturbed manner, as if she had a nest or young, but I could find neither. Oporornis tohniei. MacGillivray's Warbler. Durand took one at Mosca Creek. Oeothlypis trichas occidentalis. Western Yellowthroat. Seen at Glendale; Yellowthroats were rather common among the cat-tails at one of the small lakes at the Medano Ranch. Icteria virens longicauda. Long-tailed Chat. Several seen at Glendale. Artthus rubescens. Pipit. One was taken at Durand on a high mountain at the head of Madenos Creek; I also saw one in the same general locality. Cinclus mexicanus unicolor. Water Ouzel. Seen on Madenos Creek, and in Hardscrabble Cation. 0roscoptes montanus. Sage Thrasher. A very common bird all through that part of the San Luis Valley visited by me; two were seen about two miles north of Muddy Creek, in Huerfano County; they were very common at Westcliffe, where family parties were seen the last of July; one was taken, others seen, about ten 'miles west of Pueblo. Immediately after we made camp at the Medano Ranch I discovered a nest containing three newly hatched young, and an egg, which had disappeared the next day. This nest was in a greasewood bush. I watched it closely, intending to take some photographs as soon as the young were large enough, and the morning of July 4, knowing I was going to leave next day, went to see if everything was all right, intending to take the pictures at once, but there was only a single dead, much bedraggled young bird there, and I could find no trace of the other two. It had rained very hard the night before, but though this might account for the death, it does not account for the missing. The next morn- ing, July 5, I found about halfway between the Medano and Durkee Ranches a nest containing four eggs, about which the parents were very anxious, so I think it probable incubation was nearly complete. This was in rabbit brush about a foot above the ground, the other nest having been three feet from the ground. Minaus polyglottos leucopterus. Western Mockingbird. Seen between Glen- dale and Cation City; near Copper Gulch; at Hooper, San Luis Lake, about half