Hey! The Bittrex.com exchange has an account on Steem called @bittrex. It looks like you transferred to the real bittrex, not some fake bittrex.
It looks like you didn't include a memo with your transaction, and that's probably why your deposit hasn't shown up in your bittrex wallet. I think you'll have to open a support ticket with Bittrex.com to get the deposit credited.
But don't worry, it doesn't look like your money was stolen. Just don't transfer to @bitrex or @bitrrex. Those might be scam accounts. ;)
RE: This guy is stealing our steem