a1. Without any distinct eyebrow-stripe.
b1. Under parts white, with a wide, strongly marked, pectoral band
dividing the throat from the breast and belly; no white patch in
front of eye. ... albigularis (p. 468)
b2. Under parts whitish with no pectoral band, or with mere traces
of one.
c1. No ring of chestnut feathers around eye; a gray patch in
front of eye. ... ruficauda (p. 470)
c2. A ring of chestnut feathers around eye ... ocularis (p. 470)
a2. With a distinct white eyebrow-stripe.
b1. Crown olive; lores and fore part of cheeks blackish; pectoral
band olive, washed with rufous, shading into clear rust-red on
sides and flanks. ... insignis (p. 471)
b2. Crown dull black; general color above, including wings and tail,
dark slate; below whitish ... goodfellowi (p. 469)