Cogswell 1949 Rana boylii Willow Creek, 400 ft., Humboldt Co., Calif. aug. 29 The Trinity River 1/2 to 1 mile N. of town here is swarming with these frogs. They leap into the water, even the fairly swiftly flowing parts over the rocky rapids in a side current carrying knee-deep water. One was collected near such a site and 1 from a tribu- tary stream where it trickled down across algal covered stones on the winter flood banks of the main stream. One large tadpole, probably of this species, was seen.