5 PMyers 1979 Journal 43 Arroyo Chico, Estancia Medeland, 35 Km. S. of Juanjaco by road, Ptdo de Madariaga, Proia de Buenos Aires, Argentina 11 March (cont'd) Neotropic cormorant 1,2(3); Southern Screamer 0,2(2); Speckled teal 0,1(1); Southern Shoveler 0,4(4), Anas sibilatrix 0,5(5), Brown-headed Gull 9,3(12); Black Skimmer 1,0(1); Rufous-backed Negrito 1,3(4). Both the White-rump and the Ch.falklandicus totals are up considerably. Within the WR total the flock also picked up in the grid run (subunit 6), and another flock found between 5 and 4. The latter flock had Rpl.r within it, + therefore had moved up from below the grid (5 of) since I began reading at 08:00. (See WR sp accent) Tower Llanos, Estancia Medeland, Ptdo de Madariaga, Proia de Buenos Aires, Argentina Went up onto llanos at 1000, covering area examined 7 March. Saw 13 buffies, all but one near the area where they had been 7 March. One at head of small drainage ditch going into Arroyo at linear grid subunit 3. Then 1100 3 more appeared there, 2 of which we collected (109,110). No Thinocorus. Many White-rump and Cliff Swallows in air (latter approaching, 50% of flock). Many Rufous-backed Negritos, and Conoverdera pipits foraging in short grass + flowers. The pipit density has risen considerably inland few weeks. Saw a Queerous Harrier chasing a Negrito for ~10 sec. Unsuccessful. Arroyo Chico, Estancia Medeland, Ptdo de Madariaga, Proia de Buenos Aires, Argentina 12 March 0805 Reached curve in Arroyo below river - 18 WR present including Rpl.r. Furry processing, throstle feeding. The temperature this morning at 0600 was 14°, by 0900 it had dropped to 13.5. No sky or mist by camp (but in patches over the llanos and pintaonas a thin mist prevailed). Now in Arroyo, Clouds heavy along the eastern horizon. No wind. Began reading linear grid at 0808 with sun WNL = 700 ft. Arroyo laid similar to yesterday. Grid totals: White-rump 22,11(33), Charadrius falklandicus 7,8(15); Greater Yellowlegs 0,1(1); Southern Lapwing 1,4(5); Southern screamer 0,2(2); Speckled teal 2,0(2); Cocoi heron 0,1(1); Gresitta coniculata 1,0(1); Rufous-backed Negrito 1,2(3); Lavenderera pipit 5,0(1). Running Jaws Arroyo totals: White-rump 32,92(124), Charadrius falklandicus 16,41(57); Hudsonian Godwit 1,4(5); Greater Yellowlegs 1,1(2); Black-necked Stilt 0,1(1); Southern Lapwing 7,2(33); Neotropic cormorant 0,5(5); Southern Screamer 0,2(2); Speckled teal 0,1,13(13); Southern Shoveler 0,1(1); Cocoi heron 0,1(1); Brown-headed gull 0,5(5); Rufous-backed Negrito 6,2(8); Gresitta coniculata 0,1(1); Pseudoleistes virescens 3,0(1); Conoverdera pipit 1,3(A). As yesterday, White-rump and