J.P. Myers 1974 Journal Grid 15, (0.18) region, Estancia Medaland, 35 Km S of Juncha by road, Pte de Madariaga, Provincia de Bs. Aires, Argentina. 18 October (cant'd) by 0930. We sampled the grid twice, from 0915→0946 and 1115→1148. Grid totals (species: 1st sample, 2nd sample) Tryngite subroficollis 71,64; Pluvialis dominica 120,126; Vanellus chilensis 6,8; Limosna haemastica 1,0; Speohto coniculatia 3,3. Recall that Grid 15 covers 10 hectares (see 8 Oct. description). Tryngites have obviously decreased since the last sample (9 October) but Pluvialis is remaining remarkably constant: Oct 8: 125; Oct 9: 124; Oct 18: 120 and 126. Equally interesting are these graphs of #’s of units containing a given number of birds (i.e. a frequency histogram): [Graph with axes labeled: # of units (y-axis) and #’s of individuals within a given unit (x-axis). Data points marked as circles for Pluvialis and crosses for Tryngites.] What the graph reflects is the remarkably even dispersion of golden in grid 15 — a dispersion strongly suggesting either a very precise individual spacing plus a packed habitat or a strong tendency towards territoriality. Tryngites, on the other hand, is quite clumped in dispersing, showing many units with ≤5 birds/unit, as well as a smattering of units with up to ≥30 birds/unit. (8.11) Estancia Medaland, Pte de Madariaga, Provincia de Bs. Aires, Argentina 1740 began counting flying shorebirds from some area that we had observed 9 October, i.e., in the SW part of Town’s claim near the drainage ditch which that might have served as a funnel for roosting traffic coming in from the west. 5% clouds, and 5 wind temp. 12°C. The evening remained largely clear until we stopped counting at 1930.