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46 
Mixed Diglossini, Sept. 25, 1962, III      

[[left margin]] Glor [[/left margin]]
This was obviously a cop. attempt. Almost certainly unsuccessful.

[[left margin]] Glor [[/left margin]]
It looks as if song is a regular immediate, or nearly immediate preliminary to copulation in Diglossa!

[[left margin]] Glor [[/left margin]]
This copulation took place in bush, about 3 ft from nest and about 2 ft off ground.

[[left margin]] Glor [[/left margin]]
Nest is built in clump of grass or low bush, only a few inches above ground, on top of 12 ft cliff, right at the edge of the road.

[[left margin]] Glor [[/left margin]]
7:07. Female X is now building pretty steadily. Trip after trip. Male seems to be ignoring her. I can't see him around, and he isn't even singing. It looks as if his sex drive is satisfied for the morning. It looks, in fact, if some of his singing must have been clue to frustration of the copulatory drive. Which is perhaps what one would expect in a species without "real" pair-formation.

[[left margin]] Glor [[/left margin]]
The fact that males stop singing when joined by a female, apart from copulation, would suggest that the presence of a female may actively inhibit singing.

[[left margin]] Glor [[/left margin]]
I am now fairly certain that the St pattern seen earlier this morning must have been performed in an X male — X female encounter Comparable to St's male Ramphocelus, etc.?

Leaving X area 7:13.

Other Glors all very quiet. It is another bright sunny day

[[left margin]] Glor [[/left margin]]
Incidentally, it strikes me that there is a surprising amount of individual variation in this population of Glors. In song, plumage and general activity & mannerisms. Not what one would expect in a relatively small isolated population. (Altho it also seems to be true of plumbea in Chiriqui — to some extent at least) These birds seem

Transcription Notes:
Please verify words to the left of [[unsure]] in the form. Does he write "presence" or "precence?" PRESENCE