JPMYPS 1974 Journal (5,13) to (15,27), Arroyo Chico, Estancia Medaland, 35 Km S. of Tandil by road, Pto. de Madariaga, Provincia de Bs. Aires, Argentina 11 September (contd) of disturbance rendered further observing impossible: sheep, cattle, and Kesy, a local Irish peon. Grid totals: White-rump 12.5 (8-17)25; Baird's 2.5 (2-3)5. See Baird's and WR sp. accent. The water line at the grid was up, running ~1 m in land from the (n,1) stake. Recighting today: Rplg White-rump banded I-15-74 in the Arroyo, Hallerijn! Collected 2 WR to camp, also 1 Thincocus (9,18) Estancia Medaland, Pto de Madariaga, Provincia de Buenos Aires, Argentina Lois and I drove out to the bumpy foraging field by Rte II at 1730 in order to look for a roosting site again. On arrival, I began to census, but light was too low to allow adequate checking. Clouds 100% with a slight W wind, ~15°C. Oryzomys and Tryngite appeared to be the prevalent species, the former less abundant but more widely dispersed and therefore more evident. The huffers, ~40, were in one flock. They took off at 1803 and flew off (see Tryngite sp. accent). Plavialis present but not many. Farmhouse Monte (#2) to La Orqueta (2,3), Estancia Medaland, 35 km S. of Tandil by road, Pto de Madariaga, Provincia de Bs. Aires, Argentina 13 September 0815 left the monte in order to survey the effect of yesterday's rain, 17 mm which fell between 0430 and 2030. Temperature at dawn this morning = 10°C; clouds, 100% (fog) and no wind. I followed farmhouse road ~500 m NE, and then began working my way through a series of Spathio ridge and across a broad field to La Orqueta. This took ~50 min. I remained along the midway at La Orqueta until 1045, and then followed it and another body of water ~1000 m S, then I turned around, and returned via the old Medaland Farmhouse Rd to Farmhouse monte, arriving at 1230. Although the early morning fog disappeared before I left camp, at 1105 a SE wind began, quietly blowing over a dense fog presumably of ocean origin (the smell of salt and spray was unmistakably just as the fog arrived). Habitat of this area was described 26 August; it has changed little - a new mushroom line or blade there, the grasslands may be a bit greener, the sound is certainly thicker as a result of the heavy rains - but the precipitation did not [illegible]