INDEX. 153 



Page. 

 Sparrow, chipping. (See Spizella socialis.) 



savanna. (See Passerculus sandwichensis savanna.) 

 song. (See Melospiza melodia.) 

 vesper. (See Pocecetes 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 



vulgar e. (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 Com.) 



o 



