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cies near Quito)? If it is sometimes advantageous for previously "Allo-gregarious" species to become non-allo-gregarious, after having occupied a new area; then it is logical to suppose that selection pressure would affect passive nuclear species more strongly (and probably earlier) than active nuclear species. Active species can regulate their associations with other species more easily than can passive species. So one might expect passive nuclear species to become non-allo-gregarious before their associated active nuclear and attendant species. The latter would then be in state comparable to that of a mature strangler fig after its original support has disappeared. The flock seen this morning may [[underlined]]represent this hypothetical stage[[/underlined]].
     (If one wanted to select the local species which once played the passive nuclear role in this particular association--there is always [[underlined]]Basileuterus nigrocristatus[[/underlined]] available.)
     I lost sight of this flock after approximately 20 minutes when a passer-by appeared and asked loud questions. I [[underlined]]think[[/underlined]] the flock turned at right angles, leaving the road, and continuing uphill more directly.

September 30, 1962
Above Guasca

     This morning I came across a mixed flock twice. In exactly the same area as yesterday's flock. Obviously essentially the "same" flock both times today and yesterday.
     Flock first seen 7:35am. At this time, I saw a [[two checks in blue above here]] pair of
[[margin note]]5 [[in blue]]
II HO [[in purple]][[/margin note]]