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February 21, 1970
Puerto Umbria 

Going to work around here this morning in the hope of seeing Callimico (or something). Start out 7:00 am Weather good, but lots of rain last night. Everything flooded. Reach island 7:45 am. 
8:10. Walking thru mixed but on the whole young second growth, very flat poorly drained laud (very dense, almost suitable for moloch but with fewer lianas). Hear unmistakable Saguinus sounds. Lots of LSN's and "real" Trll's. Don't see the animals, but they sound typically fuscicollis-like, like the inds in the Caquetá. 
9:50 am. Continuing thru more or less same type of wet thicket. (Actually, there are lots of small streams and pools about. This is as much swamp forest as the bush near Valparaiso.) See a single monkey leaping thru dense tangle ca 10 ft up. Silent. Disappears immediately. Probably a Saguinus. Apparently alone
11:30 am. Arrive at a small farm where there is a captive jiw.-infant tamarin. Very definitely fuscicollis Uttering QDC-KDC. Owner says that the animal was caught only 10 days right here. This seems to be definitive
Owner says that groups of this tamarin are sometiemes accomanied by the presumed Callimico. Vut I don't think that I believe him.
Stop observations 1:20 pm. Just as rain starts