Katydid or Grasshopper?

Taxonomy is both exact and fuzzy at once. Common names are the fuzzy. Latin names generally bring exactness into the occasion, but exactness that sometimes necessitates the destruction of a specimen to properly catalog it and know for sure where it belongs.

Grasshopper and Katydid are, of course, common names. And even experts often disagree on common names.

I would consider this guy (who may be a girl?) both a Grasshopper and a Katydid. This guy certainly does hop and leap as a grasshopper should. It also sports those long antenna and long hind legs as a Katydid should.