c1. A red collar on hind neck; chin and throat black with a red spot in center of throat and a red line on middle of abdomen. ... retrocinctum (p. 624) c2. No red on the upper parts.
d1. Throat white; a red streak on middle of breast and abdomen.
e1. Chest black ... hæmatostictum (p. 625) e2. Chest light gray like the sides and flanks ... papuense (p. 626)
d2. Throat and chest red; middle of abdomen black; crissum light yellow.
e1. Larger; wing, 53 to 55 mm.; upper parts with a more steel-green gloss.
f1. Sides of head slaty black; under tail-coverts duller yellow. ... luzoniense (p. 626) f2. Sides of head glossy greenish black; under tail-coverts brighter yellow ... apo (p. 627)
e2. Smaller; wing, 47 mm.; upper parts with more steel-blue gloss. ... bonga (p. 627)
b2. Bright colors of under parts orange or yellow, or both, in males; females much plainer than the males.
c1. Entire breast, abdomen, and crissum yellow, or orange and yellow; in some species the entire under parts yellow.
d1. Under parts entirely bright yellow and orange.
e1. No yellow band on rump.
f1. Fore breast cadmium-orange much brighter than the remaining under parts ... dorsale (p. 628) f2. Fore breast orange in the center not strongly contrasting with the yellow of remaining under parts ... pallidius (p. 628)
e2. A bright yellow band on rump ... xanthopygium (p. 629)
d2. Under parts not entirely yellow and orange; throat, or throat and chin, gray or blackish slate.
e1. Chin not distinctly yellow; center of breast washed with orange.
f1. Throat decidedly lighter gray.
g1. Smaller; chin and throat faintly washed with yellow; rump faintly washed with olive ... intermedium (p. 629) g2. Larger; chin and throat clear gray; rump with a decided wash of olive-green ... sibuyanicum (p. 630)
f2. Throat decidedly darker gray or even blackish slate-color.
g1. Chin and throat ashy gray, lighter than sides of face; rump heavily washed with yellow ... assimile (p. 630) g2. Chin and throat blackish slate, nearly uniform with top and sides of head; rump slightly washed with olive. ... sibutuense (p. 631)
e2. Chin decidedly light yellow in contrast with the gray throat; breast bright orpiment-orange.
f1. Smaller; gray of throat faintly washed with yellow; no olive wash on rump; breast brighter ... cinereigulare (p. 631) f2. Larger; throat gray; rump faintly washed with olive; breast duller orange ... besti (p. 632)
c2. Entire under parts white and ashy gray, except a wide stripe of bright cadmium-yellow on middle of breast ... flaviventer (p. 632)
a2. Adults dull colored, black and white, or at least without red, orange, or bright yellow in any part of the plumage; the sexes alike in colors or similar.
b1. Upper parts nearly uniform in color, or the head and mantle, at least, of one color.
c1. Smaller; bill from nostril, 7 mm.; wing, 40 to 45.
d1. Sides of head and neck ashy or slate-color; rump and tail-coverts washed with yellow ... pygmæum (p. 633) d2. Sides of head and neck black; rump and tail-coverts glossy green like the head and back ... davao (p. 634)
c2. Larger; bill from nostril, about 9 mm.; wing, 53 to 55.
d1. Under parts white or whitish.
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