Vol. XXVIII j g AUNDERS) Birds of Gallatin Co., Mont. 43 



1911 



the middle of October. Mr. Thomas found a nest of this species near 

 Bozeman in June and I discovered one on June 25 on Middle Creek, at an 

 elevation of 7,100 feet. 



*138. Zonotrichia leucophrys gambeli. Intermediate Sparrow. — 

 Abundant migrant in May and in September and October. Richmond and 

 Knowlton stated that this form breeds in the mountains. They did not 

 state that any summer birds were taken, and since they did not record the 

 above form, I believe they must have mistaken it for this one. I have 

 never taken the form leucophrys, but have examined many birds closely in 

 the field and have never found gambeli in either valleys or mountains in 

 summer. At the Middle Creek nest mentioned above I was able to ex- 

 amine the sitting female from a few feet distance and feel certain of her 

 identity. 



*139. Spizella monticola ochracea. Western Tree Sparrow. — 

 Common winter resident in the valleys, particularly in willow thickets. 

 It arrives late in September and leaves late in April. 



140. Spizella passerina arizonae. Western Chipping Sparrow. — 

 Common summer resident. This species occurs in the valleys in cotton- 

 wood groves and in the mountains, about the edges of mountain parks, as 

 high as 8,000 feet. It is quite common in Bozeman and arrives about the 

 middle of May and leaves in September. 



141. Spizella breweri. Brewer's Sparrow. — Richmond and 

 Knowlton found this species commonly. I noted it but once, in the East 

 Flathead Valley on July 28, 1909, when I saw both adults and a young 

 bird just out of the nest . 



*142. Junco hyemalis. Slate-colored Junco. — Abundant migrant 

 from the middle of September till November and from the middle of 

 April to the middle of May. I estimated that about 10 to 20 % of the 

 flocks of migrant Juncos were of this form. 



*143. Junco hyemalis shufeldti. Shufeldt's Junco. — Abundant 

 migrant. This is usually the first Junco to arrive in spring, appearing 

 about April 1 and remaining till early in May. It is also later than the 

 other subspecies in fall, occurring from early October to the middle of 

 November. It usually forms 30 to 40 % of the migrant flocks but occa- 

 sionally flocks are almost entirely of this form. 



*144. Junco hyemalis montanus. Montana Junco. — A regular 

 migrant in flocks with the other Juncos. Since it is more difficult to dis- 

 tinguish in the field than the other forms I have few notes as to its relative 

 abundance. 



*145. Junco hyemalis mearnsi. Pink-sided Junco. — Common sum- 

 mer resident in the mountains and usually the most abundant of the 

 migrant Juncos, forming from 50 to 100 % of the flocks. This form arrives 

 in April and leaves in late October. In summer it occurs from 6,000 to 

 8,000 feet in open woods and about the edges of mountain parks. I found 

 a nest in the Bridger Mountains, containing partially incubated eggs, on 

 July 19, 1908. 



