Mammifères de Californie . nom de la Pika.) Occiput non déprimé; un processus de la molaire est prolongédpresque à l'oreille; taureau adumentaire grand; processus angulaire de la mâchoire inférieure petit, pointé, récuré; processus de condyle haut, fortement plat, large antéro-postérieur; minute de processus coronoïde, avec assupplétubertubereau juste derrière le dernier molaire; les semelles denselyhaired sauf un tampon proéminent à la base de chaque orteil; pelagethick, long, grossier. Formule dentaire, I, 2—i; C, o—o; P, 2—2; M, 3—3=26. OCHOTONID^ 181 Ochotona schisticeps Merriam. (Tête de couleur ardoise) SIERRA NEVADA PIKA. Epaissir. Forme ; non

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California mammals . name for the Pika.) Occiput not depressed; a process of the molar is prolongedalmost to the ear; aduitory bull?e large; angular process of lowerjaw small, pointed, recurved; condylar process high, greatly flat-tened, wide antero-posteriorily; coronoid process minute, with asupplementary tubercle just back of the last molar; soles denselyhaired except a prominent pad at the base of each toe; pelagethick, long, coarse. Dental formula, I, 2—i; C, o—o; P, 2—2 ; M, 3—3X2=26. OCHOTONID^ 181 Ochotona schisticeps Merriam. (Slate colored—head.) SIERRA NEVADA PIKA. Form thickset; no visible external tail, the short caudal seriesof vertebrae being folded back and lying wholly within the skin;ears prominent, broad, rounded, edged with white; whiskers verylong; color of pelage variable with locality, from brownish graymixed with black above and grayish vinaceous cinnamon below, to buffy white mixed witli blackish on the back, the basal half ofall the hairs being slaty black in both cases.. Sierra Nevada Pika. About half life size. Length about 185 mm. ( 7.25 inches) ; tail vertebrje 13 (.50) ;hind foot 29 (1.15) ; ear from crown 17 (.67). Type locality, Donner, Nevada County, California. The habitat of the Sierra Nevada Pika is the higher moun-tains of California and northward. It has been found in variousplaces in the Sierra Nevada, White Mountains, Mount Lassen, Mount Shasta and in the Warner Mountains. Probably it oc-curs in various other high mountains of California. Many yearsago Prof. Gabb reported it from^ northern Lower California, butno one has found it there since. 182 CALIFORNIA MAMMALS. I have taken Pikas in six localities in the Sierra Nevada andin the Warner Mountains. All these localities were similar andare typical of those the Sierra Nevada Pikas prefer. These arewhat are sometimes called rock slides. On a steep slope wherefavorable rock occurs the frost and weather loosens blocks ofrock, which roll down the mountain side, and the su

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