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Saccopteryx leptura
A common an small bat from the rainforest, The name sac-winge refers to small pouches on the wings . These sacs are used by males to attract females and to mark their harem territory.
RAINFOREST
It is either Saccopteryx bilineata or Saccopteryx leptura. I think it is the larger and darker Saccopteryx bilineata. Here is Leptura:
http://www.projectnoah.org/spottings/852...
http://www.science.smith.edu/msi/pdf/i00...