Wouldn't that be the Tribes of Israel? 
Wouldn't that be the Tribes of Israel?
We lost a few along the way. 8>)
Actually, there is a term among Jews to refer to other Jews -- M.O.T., i.e., Member of the Tribe. So there is a tendency that, at least I have, to think of a singular tribe.
Usage note: "M.O.T." is more often used as an adjective than a noun, as in "I never knew Harrison Ford was M.O.T."