1. Zweifel Contra Costa Co., Calif. 6.3 mi SSE Clayton Rana boylii and Rana aurora were moderately common. Five boylii and two aurora were collected and preserved within the house with a view toward examining the stomach contents. The ecologic separation noted previously holds up. The Rana aurora eggs noted last week have almost all disappeared, the jelly masses disintegrating. The water temperature was 15°C. A Thamnophis elegans atratus BT 15.8°C, was found on a rock in the stream. 9.4 mi SSE Clayton Another Thamnophis elegans atratus collected here.