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The image below is from a 2003 Pontiac Sunfire. Credits to (http://en.wikipedia.org/wiki/Pontiac_Sunfire) for the photo.
I've put arrows to the the part that I'd like to know what it's called.
I bought a used car and that part is missing.
Thanks
PS: Please feel free to update the post with more accurate information.
That is called the Engine Crankcase Ventilation Hose ... The part number is 24467120 and is #18 in this diagram:
To add to Paul's answer - the crankcase ventilation hose is required in order to prevent fumes from the engine oil escaping to atmosphere - instead they are ventilated into the air intake, so they pass through the engine and are burnt with the fuel.
