W. Rimmer 1951 Journal 17 Mar. Calif.: Contra Costa Co. Spent the hrs. 0835-1320 at Lafayette Reservoir. Objective: to determine what the Triturus were doing in regard to breeding activity. In certain areas Triturus abundant. (See T. torosus account for this date). Walked along western side of lake almost to far end i.e. and part nearest from dam. Picked up 4 Rana aurora, about 12 Hyla regilla. In addition saw Rana catesbeiana and 1 Sceloporus occidentalis. In shallow, 3-4 inch, pools in flat grassy areas above the reservoir found Hyla (?) tadpoles well along in development. Other small black larvae also present. Much silby green algae. Dense population of crustaceans and other small water animals here. Frogs, probably aurora, abundant on wet grassy margins of pools. Also in same pool saw cluster of larvae in jelly mass the size and shape of a T. torosus egg mass. Larvae elongated, pale tannish- gray, no eyes yet visible. Could be Hyla? Egg cluster attached to algae in 3 in. water. Many eggs decomposed. In main portion of reservoir in quiet water near shore two other clusters noted attached to small twig and grass stalks. One of these clusters elongate and with about 100 larvae.