JP Myers 1974 Journal 29 September (09.13) Arroyo Chico, Estancia Medaland, 35 km S. of Trenque by road, Pto. de Madariaga, Pcia. de Bs. Aires. 7 fuscolillis, 2 bairdii, and 1 Cinclodes fuscus. Also caught, but did not band, a Sicilis lubola. After banding we placed a grid in the area, 50 x 15 m in dimensions with subunits of 5 x 5 m, finishing ~ 0930. Between 0930 and 1130 I recorded the local wip flock for landed birds (see ap. accent) (12.13) Tower Llanos, Estancia Medaland, Pto. de Madariaga, Pcia. de Bs. Aires, Argentina 1800 entered the roosting area of Tower Llanos, after briefly surveying Tower Llanos swamp (and finding nothing). We parked facing west near the edge of the short-grass habitat in a position where I could see several places where we have found bairdii roosting previously. At 1806 we saw the first bairdii flight. See flocking occurrence details of evening movements. Although we were not lucky after able to locate a mixed roost of goldlens + bairdii and successfully follow them until dusk, I decided not to net because they were very spooky. Returning to camp from W which still on the Llanos (from where we found 3 CW) as they pooped from a roost site after dark. (see ap. accent). 30 September (01.19) region, Estancia Medaland, Pto. de Madariaga, Pcia. de Bs. Aires, Argentina 0445 arrived in the newly gridded area along Rk II in order to net Tryngites. Placed 4 nets by 0530. (Clouds = 0. No wind). Temp at 0345 = 3°C, but by dawn there was a heavy front. At 0557 I heard the first Pluvialis call, at this time 1V L day not register, even though I can see the nets from the car. 1V L at 0600 = 0.065fc; could cover increasing to 10%. 1V L at 0610 = [illegible] 2 fc, at which time I began to see a few Zemaidas. However, after the first Pluvialis no more appeared until 0613 when a burst in calling came, many goldlens began to appear, and a flock of ~ 30 bairdii appeared, avoiding the net, flying low. 1V L at this time = 7 fc. From this sighting on bairdii were flying continuously over the field), but we caught none. The only bird which fell was a Zemotrichia, which I cursed and released. 0620 1V L = 13fc. Sun on horizon at 0628. Just before it appeared a heavy mist almost enveloped the nets, but stopped just short. It does not appear that foreign site-banding will work for Tryngites