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 Jan., 1908 NORTHWESTERN COLORADO BIRD NOTES 25 81. 0rosc0ptes montanus. Sage Thrasher. Seen at Yampa. They were common on the sagebrush plains about Lay, and thence to Douglas Spring, and from there to Meeker. Near the lower bridge over Snake River, on June 22, we found a nest with five eggs. 82. Minaus p01yg10tt0s. Mockingbird. Frey shot one May 23, at Yarmany Creek, near McCoy, altitude 6,800 feet. This seems to me rather an unusual rec- ord for the bird. 83. Galeosc0ptes car01inensis. Catbird. Seen at lower bridge, on Snake River, and at Allenton. 84. Salpinctes 0bs01etus. Rock Wren. Seen at various places where the country was suited to its habits. 85. Tr0g10dytes aed0n aztecus. Western House Wren. The first one was seen May 18, near Sheephorn Pass, 8,200 feet. Seen at many places after that. At Steamboat Springs we had a most interesting experience with a pair. We stopped at that place from the first until the tenth of June. On the morning of the fourth I discovered a lot of twigs in the jockeybox of the wagon, which had been left open over night, and soon a wren appeared with another stick and added it to the collection. The wagon stood about parallel with and 12 feet from one side of the tent, and about midway between the front end of the wagon and the rear end of the tent was an aspen tree. We nailed an empty fruit can to the tree in such fashion that there was only a small entrauce hole. Then threw the sticks out of the jockey- box, closed it, and awaited developments. The birds Hovs came back and investigated, and presently began to build in the can. They did not utilize any of the stuff we had thrown out, but brought new. Once they, or the female, threw everything out of the can, and began all over again. They worked daily until we left, but seemed to do most of their work early in the morn- ing. I often heard the male singing at daylight, apparently right over the tent. When we left the can was full of sticks, but the birds were still working. As we were suspicious characters the town marshal had been a daily visitor at our camp, and on our departure we left the nest under his special charge, and he promised to "make it hot for any kid who monkeyed with it." I have never heard if they raised a family or not. 86. Sitta car01inensis aculeata. Slender-billed Nuthatch. Seen only at Douglas Spring, and on Tarryall Creek, but should be in other localities. 87. Sitta pygmea. Pigmy Nuthatch. Seen at Sulphur Spring; near McCoy; at Douglas Spring; and near Florissant. Should be at other places we visited, but we did not happen to see them. 88. Parus in0rnatus griseus. Gray Titmouse. Frey saw a small flock at Douglas Spring.