Napothera crispifrons calcicola
Hin Lap, East Siam.
Hitherto treated as conspecific with T. crispifrons, but differs in its tawny central belly with white shaft streaks vs grey belly with white-and-dark-brown streaks (3); smaller, more organized black arrowheads on white throat (1); paler upperparts, wings and flanks (1); shorter wing (mean of 3 males 73.7 mm vs 15 male nominate 78.6; mean of 2 females 69 vs 15 female nominate 77.5; at least 1); song a short (0.7–1.5 s) phrase of 3–6 notes vs a much more protracted (4–30 s) phrase of at least 16 notes, commonly many more (at least 2)#R. Monotypic.
SW part of NE Thailand.
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