What's On: Citigroup, Mid-Caps and Off-the-Radar Stocks

Here's what's up on Tuesday's Squawk on the Street:

--Citigroup reports quarterly numbers. Wall Street will react. The numbers will also say a lot about the health of the big banks so tune in for that.

--We're also talking about a mid-cap rally and its sustainability. Mid-cappers hit an intra-day high Friday.

--Plus, why you need to pay attention to these three off the radar stocks: Pioneer Natural, Ritchie Brothers and ParkerHannafin.

--And we'll have key housing data.

--Also Tuesday morning, the new push to teach American kids, Chinese. Our Street Poll asks if you had young kids, would you make them learn it? Share your opinion, and watch Squawk on the Street, live from the New York Stock Exchange, 9am.