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CONTENTS—con/, page 



Italy : A new Gall-making Aphia on Elm . . . . . . . , . . 174 



Italy : The Vine Phylloxera 195 



Italy : Notes on the Bryony Fly, Gonyglossum wiedemamii 174 



Italy : Oecanthus pellucens and its Parasites . . . . . . 175 



Mauritius: Lachnosterna stnithi and other Pests . . 145,185 



Mauritius : The Bionomics of Batocera tubus . . . . . . . . 185 



New Zealand : Regulations for the Introduction of iBees and Apiary 



Appliances . . . . . . . . . . . . . . . . 146 



New Zealand : An Ichneumonid Parasite of Porina . . . . 179 



New Zealand : Insects inhabiting the Gum Fluid of Pkormium . . 179 



Philippines : Pests of Sugar-cane . . . . . . . . . . 150 



Philippines : Insect Pests of Roselle . . . . . . 173 



Philippines : The Importance of a Plant Quarantine Service . . 173 

 Sumatra: The Biormcs ol Helopeltis .. .. .. 176,177 



Sweden : Notes on Apple and Pear Suckers . . . . . . . . 155 



Switzerland : Notes on the Nun Moth . . . . . . . . . . 196 



Switzerland : The Symbiosis of Wood-boring Coleoptera and Fiingi . . 196 



Switzerland : The Bionomics of Vine Moths . . . . . . . . 197 



U.S.A. : Dry Sulphur Compounds for the Control of San Jos6 Scale . . 148 



U.S.A. : A New Scolytid from Florida 150 



U.S.A.: Orchard Sprays in S. Carolina .. .. .. .. .. 151 



U.S.A.: Rhabdopterus picipes a.s an Apple Pest .. .. 151 



U.S.A.: Insect Pests in Colorado in 1919 .. .. 153 



U.S.A. : Notes on the European Elm Scale, Gossyparia spuria . . . . 154 



U.S.A.: Insect Pests in Texas in 1918-19 154,155 



U.S.A. : Insect Pests of the Evening Primrose . . . . . . 159 



U.S.A. : Two Wood-boring Buprestids 159 



U.S.A. : Notes on the Ecology of Tenebrionid Pests of Cereals . . . . 162 



U.S.A. : Notes on Microlepidopterous Pests . . . . . . . . 162 



U.S.A. : The Bionomics and Control of Aegeria opalescens . . . . 163 



U.S.A. : Improved Sprays for Codhng-Moth . . . . . . 163 



U.S.A. ^ The Fruit-tree Leaf-roller in Oregon . . . . . . . . 164 



U.S.A.: The Pear Thrips, Taeniothrips inconsequeus, in Oregon. . .. 164 



U.S.A. : Buprestids infesting Orchard Trees in Oregon . . . . 165 



U.S.A. : Grasshoppers and their Control in Oregon . . . . . . 165 



U.S.A. : The Alfalfa Weevil in Oregon 166 



U.S.A. : The Bionomics and Control of the Loganberry Crown Borer . . 166 



U.S.A. : Amounts of Spray required on Trees of different Ages . . . . 167 



U.S.A. : The Rusty Leaf-mite in Oregon 167 



U.S.A. : Measures against Tree-crickets . . . . . . . . • . 167 



U.S.A. : Notes on Miscellaneous Pests in Oregon . . . . . . . . 167 



U.S.A. : A Nematode Disease of Strawberry and Clover in Oregon . . 168 

 U.S.A. : The Effect of Injections of Carbon Bisulphide against Eriosotna 



lanigerum . . . . . . . . . . . - . . . . • . 170 



U.S.A. : The Sugar-beet Root Louse and its Control . . . . . - 177 



U.S.A. : The Fight against the Pink Bollworm 178 



U.S.A. : Orchard Pests and their Control in New York . . . . . . 179 



U.S.A. : The European Corn Borer in Massachasetts . . . . . - 180 



U.S.A. : Orchard Pests and their Control in New York . . . . 180, 181, 182 



U.S.A. : The Beet Leaf-hopper and its Para.sites . . . . . . . . 182 



U.S.A. : Infestation of Maize by Calandra oryzae . . . . . . . . 182 



U.S.A. : The Tamarind Pod-borer in Florida 183 



U.S.A. : Measures against Insect Pests in California in 1919-20 . . 188, 189 



U.S.A. : Biological Control Work directed against Coccids in CaUfomia 190 



U.S.A. : Plant Quarantine Service in CaUfomia . . .... . . 191 



U.S.A.: Pests of Grape Vines in California .. .. .. .. 191 



U.S.A. : The Life-history of Pachypsylla celtidis-gemma . . . . . . 198 



U.S.A. : A Bibhography on Fungous Insects and their Hosts . . - . 199 



U.S.A. : New Synonomy in a recent Paper on the European Corn Borer 199 



U.S.A. : Notes on the Periodical Cicada in 1919 199 



U.S.A. : Notes on the Identity of certain Chalcids . . 199 



U.S.A. ; The Bionomics and Control of Sapera creiata . . . . . . 200 



Grain Pests 145 



Notes on Palaearctic Ichneumonids . . . . ■ • 158 



The Nature of Toxicity in Metals . . . . . . . . . . 159 



The Chemical and Physical Properties of the Arsenates of Lead . . 164 



Insects of Economic Importance (Review) . . . . . . . . . . 184 



Chemical Fertilizers and Parasiticides (Review) . . . . . . 185 



The Coccidae (Review) . . . . . . . . . . . . . • 192 



Legislation against Pyrausla nubilalis in Canada . . . . . . . • 160 



