In the original Fig. 1, the callitrichids were inadvertently omitted, not just the strepsirrhines as stated in the text. We correct this with a revised figure that includes all primates for which we have data. Because the residuals are calculated from a new regression (additional data points), their absolute values shift slightly; nonetheless, the pattern remains the same: vervets lie very near the regression line of rm versus ln body size (residuals near zero), whereas patas monkeys have a very high rm for their body size. The point to the right of the patas monkeys represents ruffed lemurs, Varecia variegata.