765 Peromyscus maniculatus rubidus 'Horse Mt., 4700-5200 ft., Humboldt Co., Calif. June 7, 1933 The only Peromyscus present here, but not common at that. However, found in all associations except wet seepage + creek bottoms. About the same size as gambelli at Mad River ford, but darker in coloration. Coyote Peak, 3000 ft., Humboldt Co., Calif. June 11, 1933 Not especially common - The 3rd Commonest Mammal + evidently present in woods only (not open fields). Larger than the Arvand. form but same color - evidently. One ♀ (old) taken but not saved head from embryos × 7 (3 in one horn + 1 in other horn of uterus). June 13, 1933 Jiska number in Chugwater, margarita brush arrow on top & adjacent adjoining ridge.