When did the last of the High Elves leave Middle Earth ?

[Galin]

Originally Posted by Inziladun

I had forgotten that quote from the Prologue. I recalled Celeborn going to Rivendell, but I don't believe Celeborn was of the High Elves. Wasn't he one of the Sindar from Doriath?

Yes Celeborn was Sindarin -- the Teler of Aman idea being essentially a draft idea.

The only explanation for the apparent variance between the statements in the Silm and FOTR would seem to be that some of the remaining High Elves were not of the Noldor, though I don't know how that could be.

It could be because the term High-Elves appears sometimes equated with Eldar (despite the definition of Tareldar published in Morgoth's Ring). For the latest bolstering of this usage (gleaned from Tolkien's own examples), see Christopher Tolkien's description of the Quendi in his Introduction to The Children of Húrin.

I don't know if Tolkien meant the two texts to be taken this way: in other words, maybe the text published in The Lord of the Rings was meant to supersede the description in Of the Rings of Power; but in any case it appears that 'High Elves' can have more than one application.