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Thanks to Roger Thomason to point this thread out to me!
Awesome pictures, and yes it is clearly Cyphomyia chalybea, a male. I have only the close related C. dominicana (guess from where it is?!) in my collection (So I am of course very interested in the specimen, but I am fine with whatever collection it ends up - no worries). Also Woodley 2014 described a new Cyphomyia and gave a key to the Caribbean species (https://zookeys.pensoft.net/article/4229/). Again great pics and a rare find.