lups

Hi Everyone, A couple of weeks ago i took my car for repair. The thing is that i no longer see the hose that is connected to the motor cap (The one on the red square) I believe its got something to do with the throttle body. Could someone please enlighten me and tell me what is this hose called? and where does the other side connects to? Ill need to buy and replace it. PD: The pictures are not from my car. I really appreciate any help. Regards.