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 May, 1912 SOME NORTH-CENTRAL COLORADO BIRD NOTES 95 Walden, June 28, tvo eggs were found, and near our Hell Creek camp I flushed a bird from a single egg. She was very anxious about it, and I was able to secure a number of excellent pictures of her; this was July 3 and 4. Durand also found two eggs in another direction from the same camp. July 8 he found a single egg in the road or trail up which we had to drive to get to our Mt. Zirkel camp. July 17 we flushed the bird from the still unhatched egg. 40. Aeronautes rnelanoleucus. White-throated Swift. There was a small colony about the West Pawnee Butte. Durand saw eight or ten. 41. Selasphorus platycercus. Broad-tailed Hummingbird. First seen near Home P.O. At Chambers Lake it seemed rather common. It was fre- quently noted near our Mt. Zirkel camp, and was seen at Buffalo Pass and Steam- boat Springs. Durand often said he heard Hummingbirds at various of our camps and elsewhere, without seeing them, but while I have no doubt that he was correct, I do not quite like to list them on such evidence alone. As for myself, my hearing is not good enough to be of any use in such cases. Fig. 37. WESTERN NIGHTHAWK ON THE GROUND 42. Tyrannus tyrannus. Kingbird. Seen rather frequently the first few days of the trip until ndar Simla. then at Cedar Point, and near Agate; next May 31, south of Fort Morgan. It was common at the latter place. It was not noted again until we neared Ault, and thence was quite common to Fort Collins, and beyond nearly to Log Cabin. After that we saw no more until the last two days of our journey, when it was fairly abundant from eight miles west of Golden to Arvada. 43. Tyrannus verticalis. Arkansas Kingbird. This species was observed at intervals from Elbert to Pawnee Buttes, where there was at least one pair hanging about our camp. I supposed they must have a nest in the creek bank scmewhere, but could not locate it. It was very common at our camp near Briggsdale, and between Ault and Fort Collins. I have no further record of the bird until we reached Steamboat Springs, where it was common, and frequently noted along the road from there to beyond Coulter.