CONTENTS 



PAGE 



The genus Crataegus 1046 



Ecological summary , 1047 



The relation of Crataegus insects to apple, pear, and quince 1050 



Biological notes on insects feeding on Crataegus, as observed by the writer from 1917 



to 1920 1051 



Acarina 1051 



Tetranychidae : 1051 



Eriophyidae 1052 



Orthoptera 1054 



Acridiidae 1054 



Hemiptera . 1054 



Miridae (Capsidae) 1054 



Tingitidae 1056 



Cicadellidae (Jassidae) 1061 



Membracidae 1063 



Aphididae ". 1063 



Coccidae 1065 



Thysanoptera 1066 



Thrypidae 1066 



Coleoptera 1066 



Elateridae 1066 



Buprestidae 4 1066 



Scarabaeidae '. 1066 



Chrysomelidae 1067 



Curculionidae 1068 



Lepidoptera 1072 



Papilionidae 1072 



Saturniidae 1073 



Arctiidae ' 1073 



Noctuidae 1073 



Notodontidae 1074 



Lymantriidae 1075 



Lasiocampidae . . . .' 1075 



Geometridae 1076 



Sesiidae (Aegeriidae) 1076 



Pyralidae 1077 



Tortricidae 1077 



Yponomeutidae 1078 



Elachistidae 1079 



Lyonetiidae , . : : 1079 



Ccsmopterygidae 1080 



Diptera 1080 



Cecidomyiidae (Itonididae) 1080 



Trypetidae : 1085 



Hymenoptera 1086 



Tenthredinidae 



1041 



r r 



5077C1 



