Empidonax difficilis UC Campus Berkeley, Alameda Co., Calif. Apr. 4, 1940 10:35 25' up in 1st large laurel E of junction of N or S Fks Strawberry Cr. on S FK. - at S edge eucal. grove. Foraging. Still for ½ min or more. Then flies catche, gives pee-ist . at intervals, a slight sic , or seek. Only 1 heard. Quivers wings & tail after and as alights. Calls just after alighting . (At least 2 downys here) 11:58 AM One in old Cr. bed E Cowell. Foraging in low Catalina cherry near (10') laurels 75 yds. upstream from Sr. Women's hall. tseek & tseek - no pee-est Upright posture.