Unity 4.6 no microphone devices

I've tried this on two different mac machines with yosemite and am getting no devices. There is a built-in microphone, and usb microsoft microphone that should show up in the list.

 Debug.Log(Microphone.devices.length);
 for (var device in Microphone.devices)
         {
             Debug.Log("Name: " + device);
         }}