Species              Lived when      Adult        Adult       Brain volume 
                     (mill. yrs)     height (m)   mass (kg)   (cm**3) 
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H. habilis           2.2 - 1.6       1.0 - 1.5    33 - 55     660
H. erectus           1.4 - 0.2       1.8          60          850 (early) - 1100 (late)
H. ergaster          1.9 - 1.4       1.9                      700 - 850
H. heidelbergensis   0.6 - 0.35      1.8          60          1100 - 1400
H. neanderthalensis  0.35 - 0.03     1.6          55 - 70     1200 - 1700
H. sapiens sapiens   0.2 - present   1.4 - 1.9    50 - 100    1000 - 1850
H. floresiensis      0.10 - 0.012    1.0          25          400
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Source: http://en.wikipedia.org/wiki/Human_evolution