Zweifl Journal 43 May 1, 1952 the mountain to get him to pull us out with his jeep. He responded nobly. At the 4500' level there is a rather level area of grass and valley oak. Most of the rest of the way down the mountain was lightly wooded with digger pine, blue oak & live oak. Along the creek there was a much heavier stand of trees. There appears to be a good stand of timber on the mountain, but we could not make it up there to the level of the timber. By the time the car was out of the mud, it was after dark. Except for a few skinks picked up both driving up and taking down the mountain, we collected little here. We drove until about midnight, making camp at Fernclmont Flat on the Ridge Route, Los Angeles County. There was a mixed chorus of Hyla regilla and H. arenicolor here, when heard together, the two calls are quite distinctive, Regilla with its disyllabic croak and arenicolor with its mono- syllabic "quack".