INDEX. 147 
Page. 
Aphis middletoni, host of Aphidius testaceipes 116 
monardx, host of Aphelirfus mali 123, 125 
cenotherx, host of Aphidius testaceipes 116, 125 
on peach, host of Aphidius testaceipes 117 
rumicis, host of Aphidius testaceipes 116, 125 
sacchari (?), host of Aphelinus mali 123, 125 
setarise, host of Aphelinus mali 122, 125 
nigritus 123, 125 
Aphidius testaceipes 116, 125 
Pachyneuron sp. , a secondary parasite 127 
prey of Baccha clavata 132 
sp. , host of Aphidius testaceipes 125 
viticola. (See Macrosiphum viticola.) 
Arrhenatherum elatius, food plant of spring grain-aphis in Europe 41, 43 
Astragalinus tristis, enemy of spring grain-aphis 135 
Audibertia stochoides, food plant of Macrosiphum sp 117 
Avena barbata, food plant of spring grain-aphis in Europe 41, 43 
elatior= Arrhenatherum elatius 41, 43 
fatua, food plant of spring grain-aphis in Europe 41, 43 
sativa. (See Oats.) 
Baccha clavata, enemy of Aphis maidis 132 
medicaginis 132 
setarise 132 
Baccharis viminalis, food plant of aphidid 117, 125 
Barley, food plant of spring grain-aphis in America 43 
Europe 41, 43 
' ' Bermuda grass, ' ' food plant of spring grain-aphis in Africa 43 
Birds, enemies of Aphis avenx 135 
Macrosiphum granaria 135 
spring grain-aphis 135 
Black gum. (See Nyssa sylvatica.) 
Bluegrass (see also Poa pratensis). 
food plant of Rhopalosiphum pox *. 123 
African. (See Andropogon hirtus.) 
Bromus commutatus, food plant of spring grain-aphis in America 42, 43 
erectus, food plant of spring grain-aphis in Europe 41, 43 
hordcaceus, food plant of spring grain-aphis in Europe 41, 43 
inermis, food plant of spring grain-aphis in America 42, 43 
maximus= Bromus villosus 41, 43 
mollis=Bromus hordeaceus 41, 43 
porteri, food plant of spring grain-aphis in America 42, 43 
secalinus, food plant of spring grain-aphis in America 41, 42, 43 
tectorum (?), food plant of spring grain-aphis in America 42, 43 
unioloides, food plant of spring grain-aphis in America 42, 43 
villosus, food plant of spring grain-aphis in Europe 41, 43 
Brush drag against spring grain-aphis 136-137 
Buckwheat. (See Fagopyrum esculentum.) 
Burning-over infested spots against spring grain-aphis 137 
pastures against spring grain-aphis 142 
Capriola dactylon, food plant of spring grain-aphis in America 42, 43 
Europe 43 
Capsella bursa-pastoris, food plant of aphidid 116, 125 
Cecidomyiidae, enemies of spring grain-aphis .-,«,...-,. , 133-134 
