INDEX. 149 



Page. 

 Goldfinch. (See Astragalinus tristis.) 

 Grain-aphis, spring (see also Toxoptera graminum) . 



aberrant individuals 81 



age at which females begin reproducing 70-71 



ant enemies 136 



attack, character 44 



bird enemies 135 



birth of young : r 63 



confusion with Macrosiphum granaria 13, 23 



description of different instars 58-59 



summer forms 59-61 



diffusion, influence of temperature thereon 88-94 



winds thereon 81 



distribution in the eastern hemisphere 16-18 



western hemisphere 18-19 



earliest observations in America 13-16 



early records in Europe 16 



egg, description 95-97 



embryology 94-103 



observations 97-102 



summary'. 102-103 



enemies 103-136 



miscellaneous 135-136 



fecundity of oviparous forms 81 



viviparous female 73-75 



wingless versus winged females 75-76 



first generation, fifth instar or adult stem mother, descrip- 

 tion 58-59 



first instar, description 58 



fourth instar, description 58 



second instar, description 58 



third instar, description 58 



food plants 41-43 



fungous enemy 136 



generations, number 52-57 



per year 63-70 



literature consulted 144 



longevity 72 



of sexes 80 



losses from depredations in 1907 39^40 



methods and material for embryological studies 95 



migratory female, description 60 



molting 61-62, 78 



number of generations per year 63-70 



molts 61-62 



oviparous development 78-81 



female, description 77-78 



forms, fecundity 81 



oviposition, age begun by females 78-79 



period 79-80 



place 79 



outbreak of 1890 19-24 



1901 24 



