Nov., 1907 A COLLECTING TRIP BY WAGON TO EAGLE LAKE 191 



Regulus satrapa olivaceus. Western Golden-crowned Kinglet. Fairly com- 

 mon at the lyake; one was taken. 



Regulus calendula. Ruby-crowned Kinglet. One seen and shot near Papoose 

 Valley. Rare. 



Myadestes townsendii. Townsend Solitaire. First seen in the timber near 

 Big Meadows. Breeding at I^ake. A nest was found near Papoose Valley with 

 two young and one addled egg. 



Hylocichla guttata sequoiensis. Sierra Hermit Thrush. Very rare thru the 

 Sierras. One taken near Papoose Valley July 1. 



Merula migratoria propinqua. Western Robin. Common thru the Sierras, 

 and breeding at the I^ake in quantities. Juveniles taken, and set of four eggs 

 found. 



Sialia mexicana occidentalis. Western Bluebird. Juveniles taken June 12 on 

 the Chico Mountains. Breeding at lyake. 



Sialia arctica. Mountain Bluebird. Juveniles and adults taken at Eagle lyake. 

 Birds fairly numerous. 



A NEW BREEDING BIRD FOR COIvORADO: 

 THE CASSIN SPARROW {PEUC.^A CASSINl) NESTING NEAR 



DENVER 



, By L. J. HERSEY and R. B. ROCKWELL 



ON 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 ly^, inches, short 

 diameter 2 inches, and long diameter 2J^ 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 aud 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 



