THE AUK, VOL. XXXIV. PLATE XIII. 
NAturRAL Size. Proto. sy L. W. BrowNELL. 
BuLAcK-THROATED BLUE WARBLER (1 AND 2). 
NORTHERN PARULA WARBLER (3 AND 4). 
WHITE-THROATED SPARROW (5 AND 6). 
SUCCESSIVE SETS FROM THE SAME PAIRS OF BIRDS. 
