. La vie animale dans le Yosémite ; un exposé des mammifères, oiseaux, reptiles, et amphibiens dans une section de la Sierra Nevada. Zoologie. BABBITS Jack Rabbit 225 dans la plaine du pays. Pour cette raison, entre autres, des informations exactes sur de nombreux points dans l'histoire de la vie de la Sierra Hare doit encore être obtenue. L'aire principale de l'White-tailed Jack Rabbit Tuolumne Meadows et commence à Vogelsang Lake, où les preuves de l'espèce, dans la manière de crottes dispersées sur un terrain découvert, a été trouvé par nous d'être assez abondant. Un événement extraordinaire, rapporté par M., Laurent Souvelewski, était

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. Animal life in the Yosemite; an account of the mammals, birds, reptiles, and amphibians in a cross-section of the Sierra Nevada. Zoology. JACK BABBITS 225 Rabbit in the low plains country. For this reason among others exact information on many points in the life history of the Sierra Hare is still to be obtained. The main range of the White-tailed Jack Rabbit begins at Tuolumne Meadows and Vogelsang Lake, where evidence of the species, in the way of droppings scattered on open ground, was found by us to be fairly abundant. An exceptional occurrence, reported by Mr, Lawrence Souvelewski, was that of a White-tailed Jack Rabbit at the immediate east base of Half Dome (altitude about 7500 feet). The animal was seen there on numerous occasions during the summer of 1919. On none of the western peaks (such as Mount Hoffmann, Mount Clark, or Clouds Rest) did we find evidence of the presence of this species; but along the main crest of the. Sierras, rabbits were found to inhabit the gentler slopes of all the higher peaks such as Parsons Peak, Mount Florence, Mount Dana, and Warren Mountain, even up to alti- tudes of 12, 000 feet. On the east slope, White-tailed Jack Rabbits were ob- served at Walker Lake, near Williams Butte, near Mono Mills, and on the slopes of Mono Craters. When fully adult, this species is half again the size of its black-tailed relative. Compared with the latter its ears are slightly longer and pro- portionately broader, its head is more massive (fig. 34), its pelage denser and longer, and its tail longer and more fluffy in appearance; its feet are always heavily clad in fur (whence the name "snowshoe rabbit"). The white-tail has two regular molts each year. One in the fall changes the color of the animal from the pale brown summer coat to the pure white of winter. The second molt, in the spring, accomplishes a return to the brown pelage. The feet and tail do not participate in this color change but remain white all summer, save as discolored

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