a1. Cheeks blue.
b1. Cheeks and collar pale blue. ... lunulatus, [male] (p. 285)
b2. Cheeks and collar bright blue. ... intermedius, [male] (p. 285)
a2. Cheeks green.
b1. Collar deep blue. ... mindanensis, [male] (p. 286)
b2. Collar yellow, with crescent-like black bands. ... lunulatus,
[female] (p. 285); mindanensis, [female] (p. 286)
b3. Collar faint orange-yellow. ... intermedius, [female] (p. 285)