Monarcha castaneiventris megarhynchus
Rothschild and E. J. O. Hartert, 1908,
Until recently treated as a race of M. castaneiventris, but genetically#R, morphologically and vocally distinct, with a longer bill, wing and tail (effect size for male bills 6.16, score 3); fractionally paler chestnut underparts (ns); and song with a larger frequency range (3) and different note shape (1)#R. Subsequent treatment as a race of M. ugiensis#R plausible on genetic and geographical grounds, but latter differs strongly in phenotype (see below). Monotypic.
Makira (San Cristobal), in SE Solomons.
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