Key to Scientific Names in Ornithology

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(Tyrannidae; Ϯ Greyish Mourner R. simplex) Gr. ῥυτις rhutis, ῥυτιδος rhutidos  wrinkle; πτερνα pterna  heel; Reichenbach's 1850, plate LXV, shows the corrugations on the upper hinder part of the tarsus later commented on by Sharpe 1888.