Vitrums White Rock Range Station, 4800 ft, Trinity Co., Calif. June 1, 1946 Individuals collected in the pond are numbered J.D. 1735-1749. Catalogue No. 1750 refers to a small individual found under a board adjacent to a creek flowing below camp. This specimen is quite granular. June 2, 1946 Small individual (1756) taken from a clear pool about 2 ft deep in a creek flowing east-west in a steep-sided canyon. Vitrums in our locality have now been found in a pond, a stream, and on dry land. 2 mi. W. Hyampom, 1200 ft, Trinity Co., Calif. June 7, 1946 One specimen (1787) collected in the sand under a tangle of small willows about 100 ft from the Hayfork River and about 20 ft from a small creek flowing into the Hayfork.