Key to the Species and Subspecies. 
A. Under-surface grey. 
a. Upper-surface greenish-grey , . . . B. striata stagnatilis, p. 466. 
b. Upper-surface dark green . . . . B. s. macrorhyncha, p. 468. 
B. Under-surface more or less rufous. 
c. Upper-surface mostly dark green . . . . B. s. Uttleri, p. 470. 
d. Upper-surface mostly rufous . . . . . . B. rogersi, p. 471. 
