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(49)

Mixed Diglossini, July 24, 1965, V.

are quite silent while the Gloriss's are audible.

[[margin]] Scan [[/margin]]  Then I walk across a small patch of Paramó toward another isolated patch of scrub.  In the middle of the Parámo, I am swooped at by a single Scan!!!  (Identification definite.)  Scan then flies away over Páramo.

[[margin]] XIII? Brun [[/margin]]  A second later, see bush with dark red cup-shaped flowers at edge of this isolated patch of scrub.  A single hummingbird is feeding at these flowers.  [[underlined]] Certainly [[/underlined]] not Scan.  Has particularly brilliant patch of green on upper back.  (Possibly no. XIII?????)  Brun suddenly appears.  Attacks hummingbird and drives it off.  Then Brun feeds on flowers itself.  I don't know if this Brun is one of the individuals I have been watching in the other patch of scrub or not.

[[margin]] Brun Gloriss [[/margin]]  A few seconds later, a Brun utters many long phrases in the other patch.  Then shut up.  As soon as it shuts up, I can hear Gloriss song in distance down hill.  Then Brun sings again.  I think Gloriss down hill continues after Brun begins.  Partial overlap.  But then Gloriss apparently shut up.  Brun continues alone.  Brun shut up.  Gloriss starts again.  Shuts up.

[[margin]] Brun [[/margin]] Then 2 Bruns sing in this isolated patch of scrub.  While there is no sound of Bruns from the first patch.  So it seems likely that both patches are occupied by same Bruns.

[[margin]] Gloriss Brun [[/margin]]  Incidentally, the wind here today and yesterday (perhaps typical of the area?) Has been strongly up hill, from the south.  This favors the transmission of Gloriss sounds to the higher Bruns, while impeding the transmission of Brun sounds to the Gloriss's.  Another significant factor probably is a loudness.  The Brun songs seem to be softer than those of Gloriss.  (This difference seems to be characteristic of all forms of [[underlined]] carbonaria [[/underlined]] s.l. and