J P Myers 1943 03 Tryngites subruficollis Arroyo Chico, from Farmhouse road bridge 2km W along Arroyo, Estancia Medland, 35 km S of Juancho, Pucia de Buenos Aires, Argentina. 23 November cont'd Walking along the Arroyo we found many flocks of buffies foraging in the short grass. They were generally small, with the birds fairly close to one another — as close as 1 or 2 feet. The birds allowed me to approach within 20' before flying off. I heard no vocalizations. They appear to be well along in body molt, and perhaps very small as well: belly is white (i), breast a dirty buff, wings have a definite white patch on the secondary coverts (I think). 21 November We continued our exploration of the Arroyo all the way to the bridge at 1k 11 today. Buffies were all along it. Many suitable areas for a grid except for the lack of elevation. 2km N of Farmhouse, Estancia Medland, Pucia de Buenos Aires, Arg. 1430 while out photographing I came across a flock of 30-40 buffies preening in a short grass field. Looked very much like the roosting flock of 60+ found at Whale Cove, Golf San Jose, Peninsular Valdivia (22 October). I watched them and photographed from the roof of the Citizen until too dark to see 2045. The preening did not continue — after a while the birds started to feed again. But then, by 2015 approximately, they were roosting. As far as I could tell they did not fly before dusk, and roosted there overnight. 25 November No buffies at "roost site" observed last night when I looked at 0530 this morning. Sun was on horizon. A few buffies feeding in a flock about 200 m to N. Arroyo Chico Llanos, Estancia Medland, 35 km S of Juancho by road, Pucia de Buenos Aires, Argentina. 28 November Scattered buffies present in the short grass fields here. The car (I am perched upon the roof; Lois is driving) has a definite spooking effect — spooking birds up to 30 m away, perhaps more. The buffies are less spooked than goldens. I still have not heard a buffy call when spooked. Because of the car, I'm not sure what to think of my impression this afternoon of the birds' dispersion — there are small groups spread sporadically over the llanos, more near the Arroyo than away from it. It stopped for an hour at the potential grid site, and eventually the birds came back, 4 or 5 always.