JPMayers 1974 Journal 65 1 April (cont'd) Arroyo Chico, Estancia Mieland, 35 km S. of Juancho by road, Ptdo de Madariaga, Pcia. de Bs. Aires, Argentina After completing the sample I drove S. along the linear grid looking for banded birds. Despite the 30 cm. rain of 30-31 April the Arroyo was at its lowest level yet with several new islands appearing and all foraging areas disappearing. Totals: White-rump 23,42 (65); (Haradius fallax) 20,29 (49); Zonibyx modestus 1,0(1); Hudsonian godwit 4,1(8); Black-headed Stilt 4,10(14); Southern lapwing 4,10(14); Greater Yellowlegs 0,2(2); Spotted teal 0,25(25); Brown-headed gull 4,20(24), Geositta cunicularia 9,7(3); Cicadula fuscus 0,1(1); Rufous-backed Nighthawk 4,9(13); Coundera Pipit 1,0(1). 6 banded WR, 4 territorial and 2 non. 4 banded Ch falconiticus. The WR numbers are obviously up from the last few readings of March, and the increase did not result from the presence of any tighter flock. Rather, the birds there were generally more birds in all areas (except where they had been banded before, + three areas appeared to have similar #s) than the 'invaders' as in holes. Tower Llanos, Estancia Weekland, Ptdo de Madariaga, Pcia. de Bs. Aires, Argentina After finishing in the Arroyo I went out onto the Llanos to search for buffle. After a considerable search I found a flock of 20 between the thistle patch S. of the tower and the ditch before the gate. One other solitary buffle to the E. from there. Also found 5 Oreopholus on Grid 7 (100 percent). Thinocous are very numerous now, I found several Shuandard in the SW quarter of the Llanos. Numerous Lenoria, Anthus, and Vanellus are still dispersed over the short grass areas. By 1000, about half-way through my search, the fog was not completely cleared off, but it had dissipated enough to show a perfectly clear sky above. Wind continued to pick up from SW, but never became strong. Returned to camp at 1030. 2 April. Mouth of Canal Fijito Laguna Mar Chiquita, 21 km N. of Mar Chiquita by road, Ptdo de Mar Chiquita, Pcia de Bs. Aires, Argentina 1800 began walking from end of road out to the mouth of Canal 7. 0% clouds, wind light to moderate from E. Temp 22-23°C. Moon invisible, 3/5 full. [illegible] at 200m ahead of the canal edge, Entering Laguna Mar Chiquita, Canal 7 splits into one main channel and a minor one, forming a broad delta - a very shallow sand plain of over 300 x 200 m dimensions. In this broad area when we arrived were several exposed flats of sand, terminating 125m from shore, and broken by several shallow 'channels'. The total effect is one of an intricate mosaic of interrupted sand, mud & water. To make the habitat more intricate, [illegible]