Key to the Species. 
Summer-plwnage. 
A. Lores black. 
a'. Smaller ; bill more slender. . . . . . S. alhifrons placens, p. 375. 
h\ Larger ; bill heavier and longer . . . . S. alhifrons tormenti, p. 382. 
B. Lores white. 
c'. Darker ; with less white on forehead . . 8. nereis nereis, p. 383. 
d\ Lighter ; with more white on forehead . . 8. nereis horni, p. 386. 
374 
