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82 THE CONDOR VOl. XV While roaming over the mountain side at various times previous to the snow fall, no less than ten Calaveras Warblers expressed anxiety and disapproval of my presence when trespassing near their chosen nesting sites. Careful xvatching revealed two nests under process of construction. After the snoxv fall, I searched over the same ground on many occasions, and, as no warblers xvere heard or seen that could be identified as this species, [ am of the opinion that all, or nearly all, perished in the catastrophe of June 23 . An apparent loss was only noticeable in three other varieties of birds. The fairly common Western Tanager was probably reduced in numbers one-third. Three pairs of Olive-sided Flycatchers had selected home sites at a distance oi one half mile of each other. One had a nest more than eighty feet up on a hori- zontal branch of an immense fir; the others undoubtedly had nests concealed in dense foliage of lofty cedars. As but one bird xvas observed between June 22 and July 9, I surmise that the snow proved fatal to the others, for birds having such distinctive notes could hardly be overlooked by a person searching for them. Fig. 22. Cisco, CALIFORNIA, FROM THE HOTEL GROUNDS; PHOTO TAKEN ABOUT 8 A.M., JUNE 30, 1912; TWO HOURS LATER THE TREES WERE NEARLY FREE OF SNOW Photo by Mrs. W. W. Cooley For a week previous to June 22, I daily noticed a flock of six to seven Pine Siskins around the hotel barn. One fell a victim to the house eat; and the others yanished a day later. I might attribute their total disappearance to the cat and the snow, but I am inclined to believe that they moved on to a better feeding ground to establish a summer home; for a favorite food of the Siskin is the un- ripe seed of the dandelion. The above mentioned eat was very destructive to bird life. He was seen to jump and catch a male Northern Violet-green Swallow as it flew over the croquet ground. He was also seen to stealthily approach and make an unsuccessful spring at a Pacific Nighthawk resting on the bare earth at the side of a mountain trail; and he was often found prowling beneath brushy thickets in search of prey. As one cannot accurately estimate the mortality among adult birds, I merel.v state facts actually observed. This census of nests, found by the writer between