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126 THE CONDOR Vol. XVI been destroyed by repeated fires, but in other parts, particularly about the headwaters of the Sun River, there are extensive forests of evergreen trees. In the Transition zone the principal trees are the Limber Pine (Pinus flcxilis) and the Douglas Fir (Pseud.otsuga taxifolia). The first forms rather' extensive but open forests of crooked and stunted trees along the eastern bor- der of the mountains. The latter occurs on north slopes and along streams, and extends up into the Canadian zone. The most extensive mountain forests lie in the Canadian zone. The principal trees in these forests are the Douglas Fir, Lodgepole Pine (Pinus murrayana) and Engelmann Spruce (Picea engel- manni). In the Hudson/an zone most of these species occur as'stunted trees, and with them are also the White-bark Pine (Pinus albicaulis), Alpine Fir ( Abies lasiocarpa ) , and Mountain Larch ( Larix lyalli). The observations in this list were made by myself during a period from June 21, 1911, to March 3, 1913, during which time I was assigned to work on the Lewis and Clark National Forest. Most of the observations in the prairie region were made in the vicinity of Choteau, a small but growing prairie town, the county seat of Teton County. The altitude there is about 3800 feet. Southeast of Choteau are' two con.spicuous buttes, known as Rattlesnake and Priest buttes, which rise to a height of 4500 feet. At the foot of Priest Butte lies a group of three alkaline lakes, known as the Priest Butte Lakes (see fig. 41). One of these is of considerable size, and all of them attract numerous water birds, particularly during the migrations.' Another point of interest within this region is the Willow Creek Bird Reservation, an area set aside by the government, originally in the interests of the Reclamation Service, but now also as a bird reservation.. This area, which is in the prairie region, lies near the town of Augusta. I have not had oppor- tunity to visit it during the breeding season, but hav. e seen numerous water birds there during migrations. It contains one large lake which is frequented by many species of ducks, Snow Geese, and Whistling Swans. The birds recognize the protection afforded by this area, and flock there in preference to nearby areas that are otherwise similar. This area will be of great value in preserving such breeding species of-this region as the Curlew, Avocet and various species of ducks, all of which are becoming less abundant as the set- tlement of the region advances. My observations in Teton County were largely confined to the southern portion. It is quite probable that the county will be divided in the near future and the northern portion given some other name. In that case the observa- tions in this list, except those from the vicinity of Lubec and the Two Medi- cine River, will still apply to Teton County. The county at present includes that portion of the Glacier National Park which lies east of the continental ?divide. Some Previous ornithological work has been done there by Mr. George Bird Grinnell, and the results published in early numbers of Forest and Stream. I have been unable, however, to obtain access to these publications, so am not aware of just what they contain. I believe that work has also been done in this region by the Biological Survey, but most of the records are unpublished. in previous publications on birds in this region, I have spelled the name 'of the county seat of Teton County as Chouteau, rather than Choteau. Both spellings have been used commonly, and the first adopted by the post-office authorities. Since my publication, however, the town has been incorporated, and Choteau has been officially adopted. Unless otherwise stated, migration dates in this list were obtained at Choteau, or in the immediate vicinity.