INDEX. 153 
Page. 
Sparrow, chipping. (S.ee Spizella socialis.) 
savanna. (See Passerculus sandivichensis savanna.) 
song. (See Melospiza melodia.) 
vesper. (See Pooecetes gramineus.) " . 
Spelt, food plant of spring, grain-aphis in America 43 
Europe 41, 43 
Sphserophoria cylindrica, enemy of Macrosiphum granaria 131-132 
spring grain-aphis 131 
Spizella socialis, enemy of spring grain-aphis 135 
Sporobolus neglectus, food plant of spring grain-aphis in America 42, 43 
Spraying experiments against spring grain-aphis 137-139 
Stipa leucotricha, food plant of spring grain-aphis in America 42, 43 
viridula, food plant of spring grain-aphis in America 42, 43 
Sulphur and lime against spring grain-aphis 139 
Syrphid flies, enemies of spring grain-aphis 129-133 
Syrphus americanus, enemy of Macrosiphum granaria 131 
spring grain-aphis 130 
Temperature, influence on diffusion of spring grain-aphis 88-94 
influences on Aphidius testaceipes 119-121 
in relation to development of spring grain-aphis in North 49-50 
South 44-49 
outbreak of spring grain-aphis in 1907 28-29 
Tetraneura colophoidea (?), host of Aphelinus mali 123, 125 
"Texas louse," early name for spring grain-aphis 22 
Tobacco dust against spring grain-aphis 138 
extract against spring grain-aphis 138 
Toxoptera graminum (see also Grain-aphis, spring). 
parasites and their hosts 125 
Triticum repens. (See Agropyron repens.) 
spelta. (See Spelt.) 
villosum, food plant of spring grain-aphis in Europe 41-43 
vulgare. (See Wheat.) 
Volunteer growth of grain in relation to outbreaks of spring grain-aphis 140, 141 
Weather, wet, effect on diffusion of Aphidius testaceipes 121 
Wheat, food plant of spring grain-aphis in America 41, 43 
Europe 41, 43 
Winds, influence on dispersion of Aphidius testaceipes 118-119 
spring grain-aphis 81-88 
Zea mays. (See Corn.) 
o 
