J.P. WILYAS 1974 Journal (15,21) Estancia Medaland, 35 Km S. of Juancho by road, Pteo de Madariaga, Pcia de Bs. Aires, Argentina 15 September (only) nor did it appear that few were as many shorebirds involved. The behaviour of departing flock was also difficult: about was the local whirling + swirling of the birds over this particular field; instead they flew directly off to the east. I followed several flocks 300m as they flew, and it appeared as if they landed in the vicinity of the 2nd Windmill (i.e. (24,15)). Those appearing to land there included Tryngite and Pluvialis, and flocks which passed over us from the W several minutes after the main exodus. Other birds took a more northerly course. Incident vertical light at the time of departure (measured with Weston Lima Pro light meter) = 200 ft.cnd. (10,13) Arroyo Chico, Estancia Medaland, Pteo de Madariaga, Pcia de Bs. Aires, Argentina 1815 stopped at the curve in the Arroyo downstream from the Tower while returning from previous location. A mixed flock of Calidris baikii and fuscicollis, and Charadrius pallidulus were there foraging in shallow water and exposed mud. During some 45 minute observation period took notes on the calidridine flock. See Calidris baikii. This location is described 5 September journal. Rain lightly and briefly during our stay there. (0,18) region, Estancia Medaland, 35 Km S. of Juancho by road, Pteo de Madariaga, Pcia de Bs. Aires, Argentina 17 September reached (2,19) at 0645, ~ 0.5 hours after first light of dawn. I parked the car in a close position to where I'd been during the morning of 15 September as I could obtain with the scout light available for navigation. A heavy cloud cover (100%) accompanied a persistently moderate SE wind which blew all night. Temp at 0530 = 7°C. Drizzling infrequently and lightly. I heard the first Pluvialis dominica ~ 7 min after arriving, and am certain that more speckled in front of the car en route. By 0623 I could just barely perceive Pluvialis and Oxyrhynchos ~ 70 m away. Tryngite did not appear until 0632, and in number only after 06415 (see apparent) I remained until 0930. Weather conditions remained fairly constant. Collected one Tryngite (160) returning to camp in (3,16). (24,16) Estancia Medaland, 35 Km S. of Juancho by road, Pteo de Madariaga, Pcia de Bs. Aires, Argentina 1630 drove to the second windmill, 4.5 Km NE of farm house works. Clouds 100% low and H/catering but thin. Strong, persistent SE wind. Temp = 13°C. Was this one of the Estancia we first entered this season 25 August. Upon arriving at the [illegible] windmill [illegible]