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 108 THI CONDOR VoL XX dispatched a couple of experienced young field men to a site in a canyon at the base of Pikes Peak, this state, with full equipment and instructions to employ any necessary local assistance. They were on the ground seven days, during which time they spotted over a dozen nest sites. In every case the nests were located in soft crumbling limestone, and were mostly inaccessible from any point or by any means. A reference to fig. 17 will give a better idea of the Fig. 18. NEST A-D EGOS OF WItITE-TIIROATED SVtTIFT (SET .NO. 1); TAKEN -IEAR HOT SUL- PHUR SPRII-OS, COLORADO, JL'IE 24, 1916, R' W. C. Photo by J. D. Figgins. methods employed than many words of mine would do. The third day, July 2, they phoned me that they had spent a full day on one site to find only a half-completed nest, while most of their other attempts were equally unsuccessful. They had, however, located one promising nest in a erevice twenty feet back and twelve feet up, in a cave located 150 or more feet below the top of a cliff and seventy-five feet above the creek below. They