VOl 'l9n YI11 ] Saunders, Birds of Gallatin Co., Mont. 31 



The remaining data were obtained from various sources but prin- 

 cipally from the observations of Mr. Gerald B. Thomas and my- 

 self. Mr. Thomas was in this region from the fall of 1.908 to 

 August, 1909, while my own stay lasted from July, 1908, to August, 

 1909, with a few short visits since that date. During that time I 

 was assigned to work on the Gallatin National Forest and had a 

 good opportunity to cover nearly all parts of the county. 



The migration data given in this list are taken largely from 

 my own notes in the fall of 1908 and spring of 1909. Observa- 

 tions this spring (1910), somewhat further west in Montana, 

 seem to indicate that the 1909 dates were unusually late. For 

 this reason most of the species will probably be found to arrive a 

 week or two earlier, in ordinary years, than the dates indicated 

 in the list. 



The accompanying map shows all the localities mentioned in 

 the list. Since elevation is an important factor in the bird life 

 of the region, I have shown this on the map by contour lines at 

 an interval of 1,000 feet, obtaining the data for this from the U. S. 

 Geological Survey sheets, except in the extreme southern part of 

 the county where no data are yet available. 



The problem of subspecies in this region is in many cases rather 

 difficult. For this reason I have marked with an asterisk all 

 forms whose subspecific identities have been determined by the 

 examination of specimens from the region. In all other cases 

 the subspecies are assumed. 



I wish to acknowledge my indebtedness to the following persons : 

 to Dr. L. B. Bishop for the identification of subspecies and for the 

 use of his library in preparing this list; to Prof. R. A. Cooley and 

 Mr. Wyatt Jones of the Montana Agricultural College for permis- 

 sion to examine the collection of birds there and for much help 

 and information from their observations; to Mr. Gerald B. Thomas 

 for the use of his many notes and observations ; and to the Forest 

 Officers of the Gallatin National Forest for information, help and 

 encouragement given me whenever possible. 



List of Species. 



1. Colymbus holboellii. Holbcell's Grebe. — I obtained a speci- 

 men of this bird which was shot on the Madison River, near Three Forks, 

 on Oct, 17, 1909, by Mr. J. B. Pitts. 



