J.P. Myers 1974 Journal (8,11) Estancia Medaland, 35 km S. of Jujuydo by road, Pto de Madariaga, Pcia de Bs. Aires, Argentina 9 October (cont'd) of Tower Llanos. A vast flock of several hundred birds built up there, with a large majority of those counted to night settling in that area. We witnessed a remarkably constant in flight path of both species involving flocks approaching from the West of the Arroyo and presumably (almost certainly) involving (9,18) region birds: they entered the arroyo after diving low on the far side, swooping down into the arroyo out of our line of sight, then coming out of the Arroyo following the drainage ditch which begins on tower llanos in (8,11) and enters the Arroyo at (8,12). The flocks fly both in the ditch + parallel to it on T. Llanos, less than 1m above the ground, and then parallel the fence to the 11,10 region. 4 separate flocks of [illegible] followed this path. 11,10 Estancia Medaland, Pto de Madariaga, Pcia de Bs. Aires, Argentina 13 October mid afternoon we took micro-daln for Pluvialis and Tryngites in the (6,12) and 194 regions. The birds proved to be very difficult to work with, not allowing good site-specification very often. As a result in 3 hours we got only 4 points (2 of each spp). Weather during this time period was charac- terized by the threat of rain - heavy clouds moving over from NW + W, and occasional light sprinkles. Temp ± 16°C. At 17:30 we moved to 11,10, to an observation point slightly removed from the area where 9 October we had discovered a large Tryngites roost. (9,10) gate fence cattle tod area ditch area of concentrated roosting short grass with interspersed with patches of bau dirt Cover-grazed stubble of bunch-type grass Patch of bau dirt ~ 1 month See flocking count for details of the birds movement this evening. Due to the very heavy cloud cover light levels were low, earlier in the evening. To my surprise, however