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112 THI? CONDOR Vol. XVII few years ago by Mr. Sillo. way and noted in an unpublished manuscript of his now in the possession of Dr. Elrod. It is another bird that is probably increas- ing in numbers due to the increasing areas of cut-over land. The west shore of Flathead Lake is in general quite different in character from the east shore. The soil is evidently drier and the rainfall is probably considerably less. The forests are largely confined to slopes of east and north exposure, while the other slopes are clothed only with open grass land. These forests are composed almost entirely of yellow pine, the other trees, such as Douglas fir, western larch and Engelmann spruce, being confined to a few scattered individuals. The bird life of the two shores consequently differs Fig. 42. CAl'qYol'q OF TIIE PEND D'OREILLE RIVER, Mol'qTANA; i'qESTIi'qG GROUi'qD OF TIIE VIOLET-GREEN SWALLOW considerably, such species as the Audubon and Town- send warblers, the King- lets and the Olive-backed Thrush, that are common on the east shore, being almost . lacking here, while in the open pine forests Western Wood Pewees are the com- monest birds, and in the grass lands Western Mea- dowlarlcs and Western Yes- per Sparrows are abundant, all of these species being rare or local on the east side of the lake. These conditions are found well illustrated on Wild Horse Island, the largest isl- and in the lake. This island is near the west shore and al- most directly across the lake from Yellow Bay. Here. on ,July 2, two more birds new to Flathead Lake were found. The first of these was the Pygmy Nuthatch (Sitta pygmaea pygmaea). I observ- ed and later secured a sin- gle Bird of this species in the pines, and Dr. Elrod saw three more on another side of the island. The other new bird was the Prairie Falcon (Falco mexicanus), a male of which flew low over my head as I was adjusting my camera. to take some pictures from the top of a high rocky hill on the west end of the island. The mountains of the Mission Range nearest to Yellow Bay are rather low in elevation. Their sides have been burned repeatedly by forest fires, so that down timber, brush and thickets of young lodgepole pine make climbing very difficult. A trip made to the top of one of the peaks on July 16 was rather disappointing in the number of birds found. As we ascended the mountain most of the species found about the lake shore disappeared, while few of the