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Saccopteryx sp.
Looks a lot like tent making bats but are not making a tent like shape.
On the shores of Costa Rica
Absolutely correct, Bayucca! Rhynchonycteris naso as kind of "striped" forearms, have a look at some pictures here:
http://www.inaturalist.org/taxa/41396-Rh...
@Afribats: As I remember Rhynchonycteris naso looks very similar, but has somehow "striped" legs. Is that correct or are there any other criteria to separate them? Any interesting links? Thanks!