R. Zweifel May 15, 1951 266 Rana boylii 0.5 mi. S and 2.3 mi W La Honda, San Mateo Co., Calif. At about 7:30 PM Bill Bismarck and I captured three very small Rana boylii and lost two adults which were seen. One of the young was taken from an isolated diverticulum from the main stream where the water temperature was 13.5° C. The others were by the main stream, water temp 12.5° C. One was under a rock, the other (and the adults) in rocks beside the stream. The stream is San Gregorio Creek. There are a few redwoods and long fire about on the hillsides but the aspect is quite open, in contrast to the situation along the same stream 1.4 mi N of La Honda where no frogs were found, and where the water temperature was 10.9° C. Also at this latter locality the water was considerably more turbid. There are dorsal spots faintly indicated on three juveniles but edges very diffuse. The dorsolateral fold area is emphasized on two sides by an accumulation of red pigment. The throats are dark.