V. Merriam 1942 Microtus April 7, Muddy Creek, 1600 ft., 1 mi. S Chualar Canyon, Monterey Co., Calif. One ♀ Microtus with 4 14 mm. embryos was caught on top a hill where there was sparse Artemesia merging into open meadow. April 9, Muddy Creek, 1000 ft., 1 mi. S Chualar Canyon, Monterey Co., Calif. One ♂ and one ♀ Microtus were caught in runs in short grass under Black Sage and Artemesia. The ♀ had 5 embryos 18 mm. April 10, Chualar Canyon, 800 ft. Monterey Co., Calif. One immature ♀ and one immature ♂ were caught along the margin of a young wheat field where it met the Artemesia covered slopes of the surrounding Canyon.