Key to Scientific Names in Ornithology
L. subalaris under the arms < sub underneath; ala armpit, wing (cf. Late L. subalaris under the wings, under-wing).
● “allied to B[radornis]. pallidus Müll., but is smaller, darker, and above all distinguished by its dark fawn-coloured under wing-coverts” (Sharpe 1874) (subsp. Agricola pallidus).