152 THE SPRING GRAIN-APHIS OR " GREEN BUG." 



Page. 



Myzus mahaleb, host of Aphelinus mali 125 



persicse, Allotria sp. a secondary parasite 128 



host of Aphelinus semi/lavus 123, 125 



Megorismus sp. a secondary parasite 126 



prey of Aphidoletes sp 133-134 



ribis, host of Aphidius testaceipes 117. 125 



sp. on Hosachia glabra, host of Aphidius testaceipes 117. 125 



Nyssa sylvatica, food plant of Macrosiphum sp 116 



Oats, food plant of spring grain-aphis in America 41, 43 



Europe 41, 43 



(Ecanthus niveus, enemy of spring grain-aphis 136 



Oryza sativa. (See Rice.) 



Pachyneuron sp. hosts 127-128 



probable parasite of Aphelinus sp 127 



secondary parasite of spring grain-aphis 127-128 



Panicum sp. food plant of aphidid 123 



Parasites of spring grain-aphis, artificial introduction 142-143 



Passerculus sandwichensis savanna, enemy of spring grain-aphis 135 



Pasturing. (See Grazing.) 



Peach, food plant of aphidid 125 



Pemphigus fraxinifolii, host of Aphelinus mali 123, 125 



Pigweed. (See Chenopodium album.) 



(?), food plant of aphidid 125 



Plo wing-under infested spots against spring grain-aphis 137 



Plum, food plant of aphidid 116, 125 



Poa annua, food plant of spring grain-aphis in Europe 41, 43 



compressa, food plant of spring grain-aphis in America 42, 43 



pratensis (see also Bluegrass). 



food plant of spring grain-aphis in America 42, 43 



Polypogon montspeliensis, food plant of spring grain-aphis in America 42, 43 



Pocecetes gramineus, enemy of spring grain-aphis 135 



Quail, enemy of spring grain-aphis 135 



Rains, protracted, effects on diffusion of Aphidius testaceipes 121 



Reduviolus ferus, enemy of spring grain-aphis 136 



Rhopalosiphum pox, probable host of Aphelinus semijlarus 123 



Rice, food plant of spring grain-aphis in America 42, 43 



Europe 41, 43 



Rolling against spring-aphis 137 



Rye, food plant of spring grain-aphis in America 41, 43 



Schizoneura americana, host of Aphelinus mali 122, 125 



Pachyneuron sp. a secondary parasite 128 



lanigera, host of Aphelinus mali 122, 123, 125 



Scymnus sp., enemy of spring grain-aphis 136 



Seeding, late, against spring grain-aphis 141 



Siphocoryne avenae should probably be called Aphis avense 47 



Siphonophora avense= Macrosiphum granaria 13, 23 



sp. on Abutilon, host of Aphidius testaceipes 117 



Audibertia stochoides, host of Aphidius testaceipes 117 



Soap against spring grain-aphis 138 



whale-oil, against spring grain-aphis 138-139 



Sorghum, food plant of spring grain-aphis in America 43 



Europe 41, 43 



halepense, food plant of spring grain-aphis 42 



