P. L. Sclater, 1865,
Demerara, British Guiana.
Hitherto treated as conspecific with M. rivularis, but differs in its absence of (or very weak) lateral crown-stripes (2); buffish to ochre vs whitish supercilium (1); more whitish vs dull fulvous on lateral underparts (1); slightly shorter bill and tail (1); faster-ending song (6–8 vs 5 notes in last second of song phrase; score 2)#R. Two subspecies recognized.
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