Arduino Duemilanove 328 not recognizing COM on Mac, only Windows

I have a BotBorduino, which is basically the Arduino Duemilanove, and it works perfectly on my Windows machine. But when I switch over to my OSX machine the ports are all over the place (see image attached). Do I need drivers installed? What am I missing here?

Thanks in advance!
Erica

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The ancient Arduino Duemilanove uses an FTDI chip for USB-to-Serial. Did you install the FTDI driver on your Mac?