Quoting dictionary.com here in both cases:
Telesthesia: sensation or perception received at a distance without the normal operation of the recognized sense organs.
Synesthesia: A condition in which one type of stimulation evokes the sensation of another, as when the hearing of a sound produces the visualization of a color.
The first is, of course, just a fancy way of saying "extrasensory perception," but I like the flow of the word and the "formal" feeling of it. The second - well, I'm fascinated by synethesia in general. In fiction, it's a fascinating way to convey sensation.