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May, 1915 A SUMMER AT FLATHEAD LAKE, MONTANA 111 behind in point of numbers. Tree Swallows (Iridpprocne bicolor) and Red- shafted Flickers (Colaptes caret collaris) were nesting in the fir stubs, and several pairs of Juneos (Junco byemalls subsp. ?) were feeding young out of the nest. The number of nesting birds was remarkable and furnished a good example of the amount of bird life that a small area can support when it is isolated and thus protected from natural enemies. On June 30 a party from the station visited Big Fork and Daphnia Pond at the north end of the lake. Here I was fortunate in finding three species not previously listed from Flathead Lake. The first of these was the Least Flycatcher (Empidonax rainlinus). A single individual of this species was in the cottonwood trees at the mouth of Swan l?iver and was easily identified by the "chebec" call-note, a note which is totally different from that of other species of Empidonax found in this region. I am of the opinion that the Least Flycatcher is increasing in numbers in Montana, moving westward in its range. Early records of the bird in the state Fig. 41. A BAY IN WILD HORSE ISLAND, FLATHEAD LAKr, MON- TANA are few, but at present it is very common in cottonwood groves in many places east of the continental divide, notably at Bozeman, Livingston, Great Falls, Choteau, and probably other places. This bird appears to be the first one recorded west of the divide, but if my theory is correct it may be expected to become common in the region in the future. The second new bird for the region found that day was the Cassin Vireo (Lanivireo solitarius cassini). Two individuals were seen in the trees near Big Fork. Later I found by careful observation that this bird is a fairly common summer resident in the fir forests about the lake. The following day, July 1, I secured one at Yellow Bay for more definite identification. This bird has evidently been previously overlooked in the region, owing to the similarity of its song to that of the commoner Red-eyed Vireo. The third new bird was the Orange-crowned Warbler (Vermivora celata subsp. ?), an individual of which was found in song in a large area of cut-over land on the road to Daphnia Pond. This bird was found in the same place a