Pterocha 1943 Vireo gilvus June 1678 2 mi E Hayfork, 2100 ft., Trinity Co., Calif. Regularly present and fairly common in willows and poplars along streams (e.g., Hayfork Creek, stream in Duncan Creek); also ranging into oaks and occasionally conifers in the vicinity of streams. June 19 Hayfork Valley, 5-300 ft., Trinity Co., Calif. Warbling Vireo singing in conifers (white fir and incense cedar) in the vicinity of an opening cut by a small stream along which there was a deciduous growth of Cornus, Corylus, and Acer. June 24 1 mi W Hyampom, 1200 ft., Trinity Co., Calif. Common in open Garry oak woodland and on ashes, willows, and cottonwoods at the base of the slope.