There are several thousand species of humans, but only 5 surviving species. And when we say 5 surviving species, we really mean 1 that has any significant numbers, 4 down to their last members.
According to wikipedia (http://en.wikipedia.org/wiki/Homo_(genus)) there is only one species of humans remaining, Homo Sapiens. The last species of humans besides homo sapiens died out about 12,000 years ago.
"Just think of a computer as hardware you can program." -- Nigel de la Tierre