INDEX. 147 



Page. 



Aphis middletoni, host of Aphidius testaceipes 116 



monardx, host of Aphelinus mali 123, 125 



wnotherx, host of Apliidius testaceipes 116, 125 



on peach, host of Apliidius testaceipes 117 



rumicis, host of Apliidius 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 



setarix 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 



hordeaceus, 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 



