J.P. Myers 1944 Journal Arroyo Chico Estancia Mardland 35 Kms. of Juancho by road, Pteb at Madariaga, Provincia de Bs. Aires, Argentina 12 April Left camp for Linear grid subunit 9 at 0600 in a heavy low fog. Temp 9° at 0600. Within the floor a slight N wind picked up. We came out for setting, by 0710 having 3 nets placed. Driving up the Arroyo from the fence at the Send of Tower Clams I found @ Chalk-roosting Charadrius [illegible] Zonibyx, and [illegible] WR. I was almost able to grab them spot-lighted in the Arroyo. Ajai was present, foraging in the dark with its typically back-forth sweeping. Nycticorax also there. At 0900 I heard one WR, + we caught one just about that time. They did not appear in quantity until 0730, though Charadrius falllandicus, Himantopus, Vanellus, and Tringa were calling by 025. We netted 7 WRs, one previously banded (Ry./pr.), and returned to camp after finding the nets. (See WR sp accent) 13 April At subunit 1 of Linear grid at 0800. temp 0900 = 16°. heavy low fog, northeast N wind. Cloud cover other than the fog cypers to be 0, and the cover occasionally reveals clear patches above. I came out to the Arroyo at 0900, + spent the hour walking round with the headlamp. En route driving up to the tower, I found WR rooting in the Arroyo - there were several small groups by the curve S. of the tower. Also Chalk and Zonibyx. On the llanos near the tower I found Thinocorus still rooting while they had been foraging 11 in the evening, reinforcing my opinion that they root where they forage. Began radiating grid at 0806. Totals: White-rump 13,20(53); Hudsonian godwit 41(2); G.Ylega 3,0(2); Ch. falllandicus 6,9(13); Zonibyx 0,4(4); Black Necked Stilt 12,12(24); Neotropic Cormorant 2,0(2); Maguari Stork 1,5(4); Coccinella 1,0(1); Spickled teal 1,9(10); BH (scull) 41(2); Rufous-backed megito 1,0(1); Cinclus fuscus 3,0(2). Running down total: White-rump 26,46(72); H.godwit 54(9); Gallinago gallinago 0,4,0(1); G.Ylega 0,2(2); L.Legs 0,1(1); S.Lapwing 3,8(11); Charfalllandicus 13,0(47); Zonibyx 3,7(10); B.N.Stilt 28,32(60); S.Screamers 0,2(2); Neotropic Cormorant 2,2(4); Spatal 9,0(4); Y.B.Pintail 4,2(6); Maguari Stork 4,5(5); WF/ibis 0,3(3); B.H.Gull 5,30(35); Cinclus fuscus 1,1(2); R.B.Negrito 2,5(7); C.pijit 1,0(1). White-rump numbers are very close to those from the land survey, 4,11. See sp accent. After finishing the latter count I returned to subunit 10-9, at 0930, and sat there until 1100. When I arrived a small flock of WR was present, along with a Zonibyx and Ch.falllandicus. However the flock soon left, followed in less than one minute by a larger flock of small shorebirds,