S.P. Myers 1974 Journal (7,12) Estancia Medeland, 35 km S. of Juanico by road, Partido de Madariaga, Provincia de Buenos Aires, Argentina 28 November (contd) the new site at (7,12) lies directly above the Arroyo and a flightway for other species, particularly fiscicollis, which otherwise we miss. As usual, procedure is for the two of us to count all flying shorebirds within 500 m of the car on all directions; Lois takes on 'e' circle, I take the other. Any flying shorebird is counted, even if, for e.g., it is a bird which is obviously supplementing or supplemented. Usually, on this evening, these contributions of fiscicollis to the total are overwhelmed by the flux during roosting flights. Totalo: Calidris fiscicollis 124; Calidris baili 25; Calidris melanotos 8; Micropalama himalayana 9; Tryngite subficollis 322; Limosa haemastica 135; Tringa flampe 6; Platalea leucorodia culeyrae 1; Porzania Dominicana 58; Vistello dulcissimus 29; Heimankopas 4-6. Several surprises, but first — Tryngite peaked strongly at their usual time, ~20 min before sunset: the peak was considerably stronger last time, not smothered by a pre-peak (although there was a slight pre-peak). Further, most of the birds were picked up in flocks of 10+, including one of 40. The drop in golden plovers was precipitous — disastrously and enigmatically so. (We picked up no roosting flights. I see two possibilities, which must be interpreted in light of the fact that golden are still the most numerous species of migrant on the Estancia. 1) — (7,12) is not on a roosting pathway — but I can see golden roosts for more than 1 km distant and tonight, even though we knew they were out there this afternoon, there were none. 2) they are flying back individually. Difficult to believe such a drastic change would occur so quickly. 3) they are remaining on territories. I know that there were birds supplementing by us until 20:10, when we could just barely see them. But this too would require a drastic change to produce such a difference in the count. Anyway... Estancia Medeland, 35 km S. of Juanico by road, Partido de Madariaga, Provincia de Buenos Aires, Argentina 29 November Spent this a.m. taking micro-habitat data on an assortment of species of shorebird in both upland and shore habitats. We began by driving along the road to (4,15), then cutting north to the (8,20) gate, and following the series of gates along the Rk II side as far as (2,34). From (2,34) we followed the Arroyo all the way back down to (8,13) and then returned directly to camp. I did not count #'s of shorebirds seen