J-D Anderson 1957 Jan 25. Valencia Canyon & Southern Santa Cruz Co, Calif. Canyon at 3 pm. Rain very heavy & steady. After Dark 10 & macrodactylum + 3 or ? more captured marked & released. All of these were in prime breeding condition & all were moving towards the "Canyon" from the oak woods - 1 jiv was not marked, it was moving from the pond towards the oak woods. Interesting factor is that the main wave of juveniles had passed long before the adults began their breeding migration. Are there two sets of stimuli involved - could be either a temp or a rainfall threshold involved. Cannot discount the effect of the "unseasonable" early rain. Perhaps the adults must be at "sexual" peak" before they move & the first rains were too early to hit this. Should be checked. Rain stopped at 9:15. I thought it best to check other cross-road clock - before it became too dry. Did this with no more negative results. Saw several Cercidris liegubis and 1 Eusatinia on San Andreas road. No Ambystoma activity. Left for home about 10.