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Mixed Diglossini, May 29, 1965, III.

Picking insects off trees.  Silent.  No other species very close by.  Then both WCC's fly off into distant tree.  [[underlined]] Nothing follows. [[/underlined]]

[[margin]] WCC [[/margin]]  Perhaps WCC's are not [[underlined]] obligate [[/underlined]] commensals in this area, at this season, at this time of day???  Perhaps coming into breeding condition???

Starting down hill 7:55 a.m.

[[margin]] Albi? 51 [[/margin]]  Just as I go see single [[underlined]] grayish [[/underlined]] Diglossa in scrub, 2 ft up "[[female symbol]]" Albi (?), I think, but it looks more olive-gray than most – at least above (I did not get good view of underparts).  Silent and alone.

[[margin]] Ensifera [[/margin]]  Ca 8900 ft.  See single [[underlined]] Ensifera [[/underlined]] feeding in tree.  Apparently alone.

SEE ALSO TODAY'S NOTES ON GENERAL MIXED FLOCKS

REMARKS:

[[margin]] Sitti [[/margin]]  I.  I have come to the conclusion that the coloration of [[underlined]] C. sitticolor [[/underlined]] is "bright neutral".  It includes all the conspicuous "colors", except white that the Diglossini are "capable" of producing.

[[margin]] Gen [[/margin]]  II.  Just in case the preceding notes are not clear ....  I don't think that any of the local hummingbirds are [[underlined]] "obligate" [[/underlined]] commensals.  Viz the observation of a single [[underlined]] Ensifera [[/underlined]] cited above.  [[underlined]] Certainly, [[/underlined]] I have seen hummingbird X by itself alone [[underlined]] very frequently. [[/underlined]]  And I think that I have seen hummingbird XI by itself occasionally.