There isn't much said about the Silvan Elves. I would think it's because they don't play a very big part in the books overall.
They play a small part in the Silmarillion, specifically the sub-group Green-Elves of Ossiriand. It doesn't go into much detail about them though.
In The Hobbit of course, the elves of Mirkwood play a significant role. I wouldn't consider their behaviour depicted there to be accurate though. At least I hope not. [img]smilies/wink.gif[/img]
Also, The Fellowship of the Ring gives us the
glimpse of Lórien, and the Lórien elves are Silvan.
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