The following should work:
Once the serial monitor is started from within the Arduino IDE. But, alas, it does not.
In case it's relevant, on my system, the only port is "COM5 (Pololu com A-star 32U4)". The Zumo 32U4 is connected to my PC through a USB port.
Everything else works fine. I can upload and run sketches and all of the Zum 32U4 examples work as expected.