Sorex trowbridgii (1) Mad R. Ford, 2700 ft., above Rub, Trinity Co., Calif. May 26, 1933 None taken so far; strange. Traps have been set along streams & in moist willow thickets in fields. No result. May 29, 1933 Probably m 7643 is a trowbridgii. Five specimens at all have been taken, one Nov. 1936, at 5500 ft. near Zirs. Not common anywhere, however, and generally taken in damp localities has not actually at edge of water. Horse Mt., 4700-5200 ft., Humboldt Co., Calif. June 7, 1933 Scattered individuals have been taken but none near running water. All were secured in traps set in dry timber near roots or brush. Probably the population quite unstable and shrinking as headquarters due to entailed food supply from lake season. One taken during day of May 6. Lived 3 small embryos x 3 mm.