318 Rockwell and Wetmore, Birds of Golden, Colorado. [juiy 



This species was fairly common from the level of Golden upward. It was 

 first noted May 16, and was fairly common during migration. A female 

 taken July 25 showed no signs of having incubated. In the fall they were 

 seen in small flocks migrating southward, and were last seen September 19, 

 when a flock was noted high above the top of Lookout Mountain. 



24. Aeronautes melanoleucus. White-throated Swift. — This 

 bird was first seen May 16, when we found twenty or more feeding along 

 the side of Lookout Mountain. The wind was blowing a gale and the 

 black and white forms of the swifts crossed before us with almost incredible 

 speed. We would hear a twitter, see a flash and the birds would be far 

 beyond gunshot in less time than it takes to tell it. We tried in vain to 

 secure a specimen and finally gave up in disgust. A week later it was cooler 

 and we found a small flock of them coursing low down, just back of Golden, 

 where one was taken. They were now in pairs and were about ready to 

 breed. They are not as noisy as Chatura pelagica and appear smaller on 

 the wing than they really are. They nested somewhere in the mountains 

 nearby as they were seen all through June and July. On August 8 we took 

 two more from a flock on Lookout Mountain. One of these had the throat 

 crammed as full as it would hold with flying ants. The last bird was noted 

 September 26. 



25. Selasphorus platycercus. Broad-tailed Hummingbird. — 

 This species was rare here in the foothills although there was an abundance 

 of flowers, and none were seen until June 6, when one was noted above 

 Guy's Gulch. In August they became more common and were seen until 

 the first of September. An immature female was taken August 8 on Look- 

 out Mountain at about 7500 feet. 



26. Tyrannus verticalis. Arkansas Kingbird. — This species was 

 noted only a few times. On the plains further east where they were com- 

 mon, the first were seen May 9, but they were not observed near Golden 

 until May 23. The last were seen August 22, when three immature birds 

 were taken in an open field on top of Lookout Mountain. This was the 

 only time we found them at this altitude — 7500 feet. 



27. Sayornis sayus. Say's Phoebe. — Fairly common on the plains. 

 The first one was seen April 11, though further east they arrived at least a 

 week earher. On July 25 I took a young bird that had been out of the nest 

 about a week, and several more were seen, that had undoubtedly been 

 hatched in or close to Golden. Their call notes resembled those of the 

 adults but were softer as is usuaUy the case. Adults taken at the same 

 time were in very worn plumage. An immature male was taken in a field 

 on Lookout Mountain September 19, which was the only time they were 

 noted at 7500 feet and was also the last record for the fall. 



28. Nuttallornis borealis. Olive-sided Flycatcher. — We made 

 only two records here for this species. An adult female was taken on May 

 16, at 6,000 feet in Chimney Gulch, and on August 8, another was seen 

 on Lookout Mountain in company with some Western Wood Pewees. 



29. Myiochanes richardsoni richardsoni. Western W^ood Pewee . 



