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Nov., ?9o7 A COLLECTING- TRIP BY WAGON TO EAGLE LAKE ?9 ? Regulus satrapa 01ivaceus. Western Golden-crowned Kinglet. Fairly com- mon at the Lake; one was taken. Regulus calendula. Ruby-crowned Kinglet. One seen and shot near Papoose Valley. Rare. Myadestes t0wnsendii. Townsend Solitaire. First seen in the timber near Big Meadows. Breeding at Lake. A nest was found near Papoose Valley with two young and one addled egg. Hy10cichla guttara sequ0iensis. Sierra Hermit Thrush. Very rare thru the Sierras. One taken near Papoose Valley July 1. Merula migrat0ria pr0pinqua. Western Robin. Common thru the Sierras, and breeding at the Lake in quantities. Juveniles taken, and set of four eggs found. Sialia mexicana 0ccidentalis. Western Bluebird. Juveniles taken June 12 on the Chico Mountains. Breeding at Lake. Sialia arctim.' Mountain Bluebird. Juveniles and adults taken at Eagle Lake. Birds fairly numerous. A NEW BREEDING BIRD FOR COLORADO: THE CASSIN SPARROW (PEUC?/EA CA,Y, SY-N_/) NESTING NEAR DENVER By L. J. HERSEY and R. B. ROCKWELL N July 14, 1907, while working over the prairie at Barr, Adams County, Colorado, about twenty miles north-east of Denver, in quest of nests of the Mountain Plover, we were fortunate enough to flush an inconspicuous, small brown bird from a remarkably well concealed nest almost under our feet. A careful scrutiny of the Gutierrezia, or small rabbit-brush, from which the bird had flushed revealed the nest sunken into the dense foliage of the bush and totally in- visible from all points except from straight above. The nest was built among the closely interwoven stems and branches of the plant, the bottom of the nest resting on the ground but not sunken into it. It was a neat structure when supported by the numerous stems, but when removed proved to be rather flimsy in construction and very fragile. It was composed entirely of dry grass blades and stems, weed stems and bark, and vegetable fibers, lined with fine grass blades and a very few fine grass stems. The nest was unusually deeply cupped, with the sides built perpendicularly and slightly rimmed in. It measured as follows: outside, 3? inches in height, 4 inches in long diameter, and 3 inches in short diameter; inside, depth of nest cavity from rim of nest 2 inches, short diameter 2 inches, and long diameter 2 inches. The circumference of the inside of the rim was slightly less than that of the cavity where the eggs lay. The rim of the nest was not symmetrical but varied in height and thickness to conform to the branches among which it was placed, and altho built near the outer edge of the bush was supported and concealed on all sides by the spreading branches of the plant, which was about 10 inches high and 18 inches in diameter. The bush in which the nest was built was located on a small knoll about 75