Receipt 238 April 23, 1951 Los Angeles County, Calif. Little Rock Creek, San Gabriel Mtine 0.0 mi - Little Rock Dam 1.8 mi., elev. 9200' ± The canyon floor is about 75 yards wide here. Cottonwoods and Sycamores are present at the edge of the canyon, but not beside the stream, which has no trees shading it. An adult Thamn- ophis elegana hammondii (8T 21.8° C) was caught at the edge of its stream as were two Uta stansburiana. No frogs were found here. The stream is eight to fifteen feet wide and averages about 6" deep. 3.6 mi., elev. 3500' ± In a spot where the stream is rather heavily shaded by alders and cottonwoods a single Rana boylii mucrosa was found on a rock in the stream. Also collected here were three Hyla arenicolor, two Scelotes occidentalis briestae and two Thamnophis elegans hammondii. One of the garter snakes had a small (6") trout which it apparently had deshed, although the fish looked too big for the snake.