Redpoll 126 
Reproduction 34-113, 130-144 
Riparia riparia 127 
Sandpiper, Spotted 115 
Siskin, Pine 126 
Son 38-49, 131-133 
descriptions 41-43, 132 
flight, duration 48, 133 
numbers, per minute 48, 133 
visibility of Lark in 47-48, 133 
numbers, monthly variations in 
0 
38-40, 131-132 
49 
sts 
quantitative studies 
46-47, 133 
relation, to that of other birds 40-41, 132 
season 38, 131 
summary 49 
types 43-46, 132-133 
variations in, through nesting period 40, 132 
throughout a day 40, a 
Sparrow, Grasshopper 
Savannah = 1] ee 
ong 
Sparrow—Continued : 
Tree 
Vesper 
White-crowned 
Spinus pinus pinus 1 
Spiza americana 120-121 
Spizella monticola monticola. 127 
Stelgidopteryx serripennis = 127 
Sturnella magna magna. 117-118 
Summary 128-145 
Swallow, Bank 127 
Barn 127 
Rough-winged 127 
Swift, Chimney 124 
49 
Territory of a male Prairie Herned Lark 
Territories 
Tracks 
52-55, 51, 68, 54 
Tyrannus tyrannus 
Warbler, Palm 
Woodpecker, Red-headed . 
