...
cgminer --icarus-timing long -S /dev/ttyUSB0
Will work for the first one (I can see the light and it start hashing away.)
cgminer --icarus-timing long -S /dev/ttyUSB1
Works for the second one... How can I get them to both mine together?
Did you try:
cgminer --icarus-timing long -S /dev/ttyUSB0 -S /dev/ttyUSB1
?