Table 1.

Measurements and predictions from the primate specimens analyzed

SampleObserved colourPeak reflectance (nm)Peak spatial frequency (nm-1)Modal interfibre distance (nm)Peak predicted reflectance (nm)Prediction error (nm)Sample size
Mandrillus sphinx
    Male face (A24)Light blue4670.006461544303714
    Male face (A23)Light blue4580.005471824903220
    Male rump (A25)Dark blue3780.006661504103239
    Male rump (A22)Dark blue3870.00726138390329
    Female face (A20)Light blue4900.006861464603030
    Female face (A21)Light blue4910.0078612736013119
Cercopithecus aethiops sabaeus
    Scrotum (A09)Pearly blue5060.004282337602606
Cercopithecus aethiops pygerythrus
    Scrotum (A13)Vivid blue∼475*0.00587170400∼757
  • * Reflectance data for Cercopithecus aethiops pygerythrus from Findlay (1970).