20 1964 10 June Deep Springs, Inyo Co., Calif. Of this species I have seen west of the Sierras. We went to Big Pines for dinner, then returned to Deep Springs where we spent the night. 11 June It was cold and windy during the night, but clear. It became quite evident that birds had moved during the night, as there were only 1/4-1/3 as many flycatchers about compared to yesterday. Wilson Warblers were gone, and there were 6-8 Western Flycatchers about now. Heard one traili song (tits-bow). Only 1 in 2 Olive-sideds. Along the E side of the same area we found three pairs of Cassin Kingbirds. The birds were in pairs and rather evenly spaced along this area. The birds were very concerned with each other's presence, and wing fluttering & tail fanning were frequently seen. They seemed to be excluding members of adj. pairs and also Western Kingbirds. All were quite vocal, giving loud, clear "leip" notes and the characteristic "chi-boo" call. Guy saw one putting sticks on what is a good kingbird nest site, the broken end of a large branch high in a cotton wood, but the birds seemed disturbed by our presence and would not perform for me. One of the pairs is in the same area they have been the last two years, the others were in areas that were occupied by Westerns. Along here I heard a vulture singing and Guy spotted in a field maybe Indigo Bunting. This bird had blackish wings and the