R. Zonfel Mar. 23, 1953 181 Calaveras Co., Calif. We visited Camp Cornell to see this Rana sinal locality under late winter conditions. The stream temperature was 5.0° C. A nearly continuous snow cover was present, any to two feet deep in spots. According to topo. sheet (Big Tree Quadrangle), the stream is San Antonio Creek. If the topo map is correct, the head of this stream is only about a mile above Camp Cornell. In the small creek which crosses State Highway 4 at the south boundary of Calaveras Big Tree State Park, Bill Brewer collected an adult Rana boylii . This is about 3 1/2 miles air line from Camp Cornell, at nearly the same elevation (4600') and in the same drainage. It should be possible to find the zone of contact or overlay between these two species by working San Antonio Creek.