Petersen 1943 Tyrannus verticalis June 12-15 2mi SE Beegum, 1650 ft., Tehama Co., Calif. One pair was established in a comparatively open stand of pine oak on the valley flat. Some attention was paid to the territory (rather feeding and activity range, since no actual encounters were noted) of the kingbirds in relation to those of several pairs of flycatchers (Myiarchus) immediately neighboring. The areas of kingbirds and flycatchers were exclusive, and I suspect that probably were observations to be made, the two species would be found hostile - at least under these circumstances. On one occasion (June 15), one kingbird fed on a slope just above camp, coming to the ground and picking insects. Here, the kingbird was feeding on an area [illegible] in the home area of one of the Ash-throats. No encounter was observed. But the kingbird remained only briefly and was silent during his foraging. On the kingbird home area, their calls were heard regularly. June 24 1mi W Hyampom, 1200 ft., Trinity Co., Calif. Two pairs established in a grove of cottonwoods and willows, surrounded by patches of willow thickets, along cobble