51 JPMyers 1994 Journal Estancia Mickelbland, 35 km S. of Trencho by road, Pto de Maccariaga, Provincia de Buenos Aires, Argentina. 20 March contd and both Yellowlegs. White-rumps can stand at least as far as 15m out from the shore along much of the lagoon. Yet despite all this habitat, there were few birds. After exploring the marsh for ~0.5 hours, I returned to the car, and followed the swamp W to where it intersects a fence (~300 m). For the first time this year I was Humble to go East, as a patch of swamp has by now caked over completely. This put me in an area where I hadn't been since horse-back riding w/ Aureli Chiici, 13 February. I found 2 Buffles (collected on, 11c) and 7 Thinoconus. (springs) also present. Their stock of lagoon presents a scrappier appearance than Tower Llanos proper - the grass is lower, has more open space between it. The Buffles + Thinoconus were quite close to each other, but they moved separately in flight, even after I shut the traffic. After searching for more of either species, unsuccessfully, I turned North and passed through the gate W of the Tower Llanos Swamp (see map p29 Journal), tower (lones) is called La Landing Swamplin this map). Continuing N, I investigated the series of swamps only indicated on that map, and also the large lagoon. Saw a total of 12 WR, all in flight, headed (consciously) North. Also with them were several Hud- sorian Godwit. [illegible] Much of this area is drying up, and a lot of exposed, caked black mud can be found. However, apparently suitable grass still remains, much of it without any signs of WR foraging. The large lagoon had over 50 black-backed swans, a large flock of rosy-billed Pochard, shovellers, yellow-billed pintail, spotted teal. Upon reaching the next gate, I passed through and followed the fence to Arroyo Claro, reaching the Arroyo just above the Lincoln Grid Subunit 10. I followed the Arroyo North to the bridge at Route 11, ~5 km, where I had gone on foot 15 March. The moulting of WR along here has increased, and instead of being predominantly in a few flocks (the birds are much more dispersed). Tight flocks remain, but near the bend of this stretch of the Arroyo, i.e. [illegible] the W end of the linear grid, there are considerably #s of WR behaving territorially, and some that if not territorial, are certainly off spaced out. ~40 WR were in here, perhaps as many as 60. Two birds, Ry Lro and Ry Lgr were within 20 m of one another in a spit of water off the Arroyo ~500 m N of the linear grid. The latter was Muteberg, the former may have been. Further up the Arroyo, however, the prominent mode of dispersion appeared to be a tight flock. There were exceptions, certainly. In fact a significant %