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Desmia sp. (maybe D. ploralis)
I wonder if they were 2 different moths spotted on the same night. The white markings look a little different, but with the way they flew around, it was difficult to tell.
Definitely a Desmia sp., but as Philip pointed out it is really hard to impossible to separate the several Desmia sp. for sure from only a picture without the native specimen. Personally I would leave this as Desmia sp. and not going down to species level. The first spot looks for me more slim than usual Ploralis show. It might be a candidate, but we can't be 100% sure.
http://www.boldsystems.org/index.php/Tax...
I'm IDing it as Desmia ploralis, because it looks a bit like it: http://mothphotographersgroup.msstate.ed...,
and I know from bold that it is in Costa Rica.
Honestly, that genera is one of the hardest to differentiate by picture, so take that ID with a grain of salt.