J.P. Myers 1974 Journal Estancia Medaland Tower Llanos, 35 Km S. of Juncha by road, Pteo de Madariaga, Pcia de Bs. Aires, Arg. 17 November (cents) Clearing until at sunset (1936) cloud cover was under 20%. In the llanos around the observation post was a flock of foraging, supplanted Tryngite. Thus for the first time in three roost counts Tryngite has a low but finite based rate of flying during the pre-roost hours. The importance of these birds in the total count is exaggerated because the total % of traffic was down considerably. Why, I know not - observation conditions were excellent, and I knew that buffy still abounded in usual foraging areas, although there have been some shifts. It was obvious, however, that we were not placed any longer along a major flight path to the roosts. One clue may have been provided by the fact that I spotted flocks going down on the other side of the Arroyo in an area which was just sowed with corn - a place where they could now be conceivably roosting. Totals observed: Tryngite subroficollis 506; Calidris fuscicollis 22; Calidris baudii 1; Micropalama him- antopus 21; Limosa haemastica 58; Tringa s. 1; Vanellus chilensis 14; Pluvialis dominica 313; Stagnops tricolor 2. See Tryngite sp. accent re possible function of early roosting times of buffy. (10,0) to (23,15), Estancia Medaland, Pteo. de Madariaga, Pcia de Bs. Aires, Argentina. 18 November Sigh - it rained this morning, enough to make roads impassable but not enough to open the marshes. 20mm accumulated. A strong NW wind and much electrical dra- matics. So we weren't able to get to 17,28 for a continuation of the cve % TB calculation begun here yesterday. 1400 we drove from the farmhouse to the NW or far as the 2nd wind- will, taking microhabitat data on various species and reviewing cens. In general, the area is abysmally dry - the roost site at 189-19.9 has almost dried, even with today's rain. The small (18,30) tide bordered lake has finally developed mud borders - the first time that I have ever seen it with water running to or beyond the edge of the vegetation. In fact there were fuscicollis and other shorebirds foraging along the S shore. One notable event of the afternoon was the sighting of 200+ Swainson's hawks, soaring in a large flock over the Pampas grasslands.