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where there is a tame captive tamarin. Supposedly caught by bridge right in front of campomento. Certainly a Bebileche type. But apparently not the same as the fuscicollis of the Caquetá. Color as follows:
Black face and crown. White muzzle. With black tooth marks on lower jaw.
Nape and comparatively small area of upper back bright rufous.
Most of back rather finely brindled (grizzled) black and yellow.
A small area of the lower back, and the proximal third of the tail, are rufous. The distal part of the tail is black.
All or most of the underparts are rufous.
This would seem to essentially "trizonal" in Hershkovitz's sense. But unfortunately not as clear as might be [dewied?].
The individual was comparatively small.
Going on the assumption that all the local tamarins belong to this form, the population would seem to have two or three distinctive behavioral features: (1) A relatively weak (not sharp or piercing) voice, at least in the audible range. (2) Perhaps a tending to utter Whistles comparatively frequency. (3) A definitely very strong  tending to remain hidden and silent when alarmed instead of mobbing and/or uttering LSN's and [Trulls?] very frequently.