JPM Myers 1979 19 Tryngites subruficollis Tower Llanos, Estancia Medeland, 35 Km S. of Juancho by road, Ptdo de Madariaga, Provincia de Buenos Aires, Argentina 29 January cont'd 0752 d began following 1/24C, beginning in (3,0). This bird ranged from (2,1) to the edge of the drainage area behind the tower, an elliptical area with dimensions ~ 35m x 12 m. Most of its activity was between the grid + the drainase. After 36 minutes from beginning of sampling time - during which chased 2 birds and was chased back into its area by another - the bird flew across Arroyo Chico. [illegible] followed the bird to a point near (2,1) where it stopped for a few seconds. Then I followed 1/24B - which remained on the grid throughout the entire sample period, from 0755-0855. At 0813 I noted it flying from (3,4) to (1,2) in order to supplant a just landed bird. However, the new bird chased low, looked mean, and 1/24B flew back to (3,4) to paren. The territory defended by 1/24B (other 5 chases, all but 1 successful) was extraordinarily similar to that defended by 1/23C, so similar that I believe them to be the same bird. 0814 0816 124D tegan walking toward 1/24C. Rather than an obvious supplantation, when 1/24D got within 15 m of C, C began heading away from D. Both birds were feeding all the time. This was noticeable because until D began approaching, C had moved less than 5 meters in 3 minutes, whereas upon the encroachment of D, C moved 8 meters in 3 minutes (and 2 minutes later flew 15 m to supplant another buffy). However, there was no tail dragging. As soon as C left the area (i.e. entered (3,0)), D turned around + headed back + went to (0,4). How subtle! - this occurred after a buffy from the opposite side of the drainage area flew to lure to supplant another buffy. 1/24C stalked it week up, began chertling, + suppled the supplanter by flying. 0826 I picked up a buffy as it flew into (2,2) with another buffy. Followed it for 15 minutes during which time it worked steadily on toward (1,5). After 15 min it flew. It had one fight with another bird that has been frequending the (0,6)-offgrid area. This bird unsuccessfully tried to supplant 1/24E from (0,5) - 0836 - the tail dragging display again, this time by 1/24B, which I happened to be watching with binoculars. I was puzzled because 1/24B was in tail-dragging, yet there was no other bird in immediate field of binoculars. All of a sudden 1/24B flew and suppled another bird 10 m away (11). [illegible] This began at 0836 when outsider flew up + began feeding by 1/24E parallel but with tail down. 1/24E may also