J.P. Myers 1974 Journal 29 November (Contd) Sotania Medaland, 35 km S. of Juan de la Cruz by road Pto de Madariaga, Pcia de Buenos Aires, Argentina and only in a few areas was I did I take sighting records. However, I have the following impression of distribution + abundance of the different species: Vanellus chilensis abundant but dispersed, prevalent in flocks, rarely more than 2-4/hectare, occurring in all grass types under 8" in height + higher if the grass density is not too great. Pluvialis - dominicana - numerically the dominant species with several thousand birds using the grasslands; predominately a short grass bird, but will utilize higher than grass types will also use patches of short grass within other grass types (as opposed to Tryngite, which will not). Pluvialis also can be found along the Arroyo, foraging either from shallow water to the grass edge. But the contribution of Arroyo users to the total # of Pluvialis is minimal. - Charadrius falcklandicus - almost exclusively an Arroyo bird. Fewer now as compared to summer, fall + winter when migrant non-breeders are here. There is a breeding population present this year: minimum of 6 pairs (fixed, probably more), along 5 km of Arroyo. - Tryngite subbricollis - easily the 2nd most numerous shorebird. Almost exclusively a short grass bird, using heights under 4 cm. Very occasionally do I see flocks in grasses up to 10 cm and then only in very thin vegetation - e.g., Junus. They appear to require expanses of uniform suitable habitat, not using the small (25x50 or so) patches of short grass one occasionally finds Pluvialis in. At least 2000 of them on the Sotania. I was amazed this morning - even after roosting flight observations, particularly those of 6 Nov. - to see the numbers very great overall dispersion of them. They appear to be in all suitable areas available. Along our route, the only place we did not see them (except the Arroyo proper) was the potrero between the (8,20) and (10,26) gate. They were especially abundant - more so than Pluvialis, along the (29,17) gate. - Micropalama himantopus - few seen this morning; 528? Their habitat has never really developed this year, and most sightings are in the Arroyo, which last year they did not prefer. Calidris foxicollis - #3 in abundance, perhaps 300-400 including three along the Arroyo and in other marshy areas. Still, their abundance does not compare favorably with last year. Their hide forage almost exclusively on water ≤ 4.5 cm deep.