a See refs. (McHenry, 1992 and 1994).
b Endocranial volume is transformed into brain volume by formula 4 in ref (Aiello and Dunbar, 1993).
c EQ is the ratio of brain volume and expected volume. Expected brain volume is 0.0589 (species body weight in g)0.76; see ref. (Martin, 1981).
d Tooth area is the sum of the md × bl diameters of P4, M1, and M2 ; see ref. (McHenry, 1984).
e MQ is the ratio of observed tooth area and expected area; expected area is 12.15 (species body weight in kg)0.86. See ref. (McHenry, 1988).
f Two species may be represented in this sample. Using Wood's 1988 classification, I calculate the values for H. habilis sensu stricto and Homo rudolfensis as follows: male body weight, 37 and 60 kg; female body weight, 32 and 51 kg; brain volume, 579 and 709 cm3; EQ, 3.5 and 3.0; tooth area, 478 and 570 mm2; MQ, 1.9 and 1.5 kg; see ref. (McHenry, 1994b).