Holmes, R 1960 Erolia alpine 3 1 June Barrow, Alaska The intervals of 1/2-1 sec, the wing was vibrated very rapidly in a terminal position. This is usually the form when the bird just alighted. 2 June Barrow, Alaska One bird heard displaying behind the lot, one heard on the west shore of footprint. Now seen as heard near Barrowik. One heard in the evening near the south end of village slough. 3 June Barrow, Alaska One seen along the beach ridge, feeding in one to small thawed ponds. One seen near Elna town collected. Then a pair? seen feeding on a polygon top. There two took flight from my approach & flew 30 yards towards the south. The ? landed and the male did a low (10-15 ft) aerial display. Just as he finished, another bird flew in & closed the pair out & followed closely behind them for about 200 yards before turning back. Territorial boundaries have been established. Further south along the lagoon, a bird was seen feeding in the polygon troughs. After a few minutes she was joined by a displaying male. Both birds fed for awhile & then both chased a third bird migrating pair berry chased 1st sign of territorial boundaries