Petelka 1943 June 24 Lim W Hyampom, just past Trinity Co., Calif. Tyrannus verticalis washes near the South Fork. Between the low washes, there are areas of grassy flats which border also on the thicket occupied by the kingbirds. They apparently prefer the tall, open, partially dead Cottonwoods. From high perches there, they moved out over the grassy flats to forage. The two pairs mentioned earlier occupied areas adjoining each other. At one time during my observations, a member of one pair flew onto a high dead limb in the area of the neighboring pair. One adult of the second pair chased the intruder and during the chase was joined by the other adult. Both birds then chased the intruder, who withdrew to his own area where he perched in a cottonwood along with hi (her?) mate nearby.