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Mixed Diglossini, May 18, 1965, III.  (46)

^[[Scan Ater]] Altho one of the Scans here visits small trees and scrubs with Ater territory quite frequently, it does not seem to favor the same trees and bushes.

^[[Scan Ater 207]] 7:57. Aha! Scan appears, just above low scrub. [[underlined]] Ater ^[[checkmark]] flies to it [[/underlined]] Coming from site 30-40 ft away. Lands on branch about 1 ft - 9 inches away from Scan. Scan immediately hovers right above Ater's head. Scan may make a few slight forward movements, i.e. inhibited attack movements; but, if so, they are very slight indeed. But Ater also makes a few forward movements toward Scan. Singing forward with head & bill. Wings once slightly upward (apparently unritualized). Then Ater flies up toward Scan. Brief aerial dispute. Ater perches again. Scan hovers over its head again. Then Scan flies away. Ater would seem to have "won" this dispute. As far as I could tell, both birds were silent during this dispute. But a few seconds later, Ater (presumably same individual) back Singing usual perch. Now, its Song phrases seem to have slight trace terminal R or, at least, hoarse "slur".

^[[Scan Ater]] Apart from the incidents described above, the local Scan(s) are not in the Ater territory very frequently when Ater is visible. It is quite possible that the Scan(s) is (are) [[underlined]] avoiding [[/underlined]] the Ater(s) - when not actually fighting with them. If so, the Ater-Scan situation here may be comparable to the Cy-Laf situation at higher altitudes in this region.

Going to walk on a little further 8:10 am.

^[[Scan Ater]] NOTE: It has just occurred to me that I paid no attention to temporal patterning of vocalizations during observations recorded above. But, as far as I am aware, Ater and Scan vocalizations overlapped at random

8:19. Hear Whitestart Singing. Obviously Yellow-faced. No diglossine audible at the time.

^[[Ater 208]] 8:31. Back to area of Singing ^[[checkmark]] Ater. Bird perched usual place. Utters