Holmes, R. 1960 Erolia fascicollis 7. 1 July Skrovaik, Alaska The map on the previous page shows the activity of the various white-rumps on the census area. The original ncts are on the census sheets. I am still not clear as to what was happening today. There seemed to be an exceptional amount of chasing, and it was difficult, if not impossible, to establish territorial boundaries. During these chases the birds are erratic flyers. They fly close behind each other, weave back and forth, make sharp turns, etc.. It is my im- pression that there are at least 2 to 3 pair here, but even this is certainly hard to say with any [illegible] degree of certainty. 2 July - White-rump activity was again noted near the south end of the plot. At one moment, 3 or 5 were heard displaying, so there are at least 3 displaying birds. I also believe that this is conservative, that there are at least 5, if not 6 pair. 6 birds were involved in one chase while another bird was heard displaying behind me at 2.30.