J Pillars 1974 Journal 23 March (cont'd) Arroyo Chico, Estancia Medeland, 35 km S. of Tucumano by road, Ptdo de Madariaga, Provincia de Bs As, Argentina and I suspect that it is due to coastal fog, as it sometimes penetrates inland to here. By 0805 a slight NE wind was up. At that time I began reading the linear grid. Totals: White-rump 4,9(8); Charadrius falklandicus 6,11(17); Hudsonian godwit 1,0(1); Greater Yellowlegs 1,2(3); Neotropical cormorant 1,6(7); Speckled teal 10,3(13); Brown hooded gull 0,2(2); Rufous backed Negrito 0,3(3). After sampling the grid I continued North into Patron 19 grant to where Rly (gr. has been) remaining for 1.5 hrs while observing w.rumps (see apparent). Before leaving I collected 2 flocking WR (120,121). While returning I passed through the Tower Llanos, finding (after considerable searching) one flock of ~20 buffleys, and I collected 3 (122,123,124). 24 March Sun on the horizon at 0800 when I began reading the linear grid. Temp = 18°, clouds 40% - a very rosy dawn in color, with high stratus carrying the color over the fog bank along the N horizon. Wind: slight from N even at this early hour. Grid totals: White- rump 9,7(16); Charadrius falklandicus 9,7(16); Greater Yellowlegs 0,1(1); Rufous- backed Negrito 1,3(4); Geositta 1,0(1). At 0835 I turned S and ran the Arroya. Totals: White-rump 13,28(41) ; Charadrius falklandicus 16(30)46; [illegible] Buff-breasted Sandpiper 0,1(1); Hudsonian godwit 0,1(1); Southern Lapwing 3,11(14) Southern Screamer 0,4(4); Maguari Stork 0,1(1); Speckled teal 0,7(7); B. Hooded gull 0,5(5); Kelp gull 0,1(1); Agelaius thilius 0,7,0(7); Geositta 1,1(2); Cinclodes 1,0(1); RB Negrito 3,4(7); Corvendra pipit 1,6(7). The increase in WR#s were due to several small groups, including one with RrLp, 6 Banded WR, 2 Banded falklandicus. Finished run down at 0905 and went out to the Tower Llanos Swamp. Tower Llanos, Estancia Medeland, Ptdo de Madariaga, Provincia de Bs As, Argentina (wind picks) up to moderate from the N. I went across the Llanos to the swamp at the E. end, seeing WR and Cliff swallows, Leucophaeus rufus, Anthus cor- andens, Vanellus, Thresorcoris ruminicivorus, Rhea and several [illegible] unidentified tall grass dwelling juncariids en route (the latter just before Horscamp).