Gould and G. R. Gray#R, 1839,
San Cristóbal Island (Chatham), Galapagos.
Usually considered conspecific with P. rubinus and P. nanus, differing from former in similar (or more marked) characters to those for P. nanus. Differed from latter in its smaller size (effect size for male wing –4.85; score 2); paler red underparts in male (1); browner upperparts in male (1); darker buffy-yellow underparts and buffy-yellow vs whitish throat and supercilium in female (3); split supported by recent DNA study#R. Monotypic.
San Cristóbal I, in Galapagos.
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