Contents. 



PAGE 



Introduction. ... ... ... ... ... ... ... ... i 



Experiments with Insecticides. ... 4 



Report and Summary of the 1906 Investigation on the Black-Currant 



Gall-Mite. 9 



Eelworms 9 



Woodlice. ... ... ... ... ... ... ... ... .. 9 



The Mussel Scale. Mytilaspis pomorum, Bouche 10 



The White Wooly Currant Scale. Pnlvinana ribesii, Sign. ... n 



The Felted Beech Coccus. Cryptococcus fagi, Barensp. ... ... 13 



The Hop Aphis. Phorodon hunmli, Schrank. ... ... ... ... 14 



The Plum Aphis. Aphis pntni, Reaumur 14 



The Apple Leaf Aphis. Aphis fitchii, Sanderson. ... ... ... 14 



The Willow Aphis. Melanoxanthns salicis (Linn.) ... 15 



The Apple Sucker. Psylla mali, Forster. (Illustrations.) 15 



The Rhinoceros Beetle. Sinodendron cylindvicnw, Linn. ... ... 18 



Wireworms. (Illustrations.) 18 



The Large Poplar Longicorn. Saperda carcharias, Linn. 



(Illustrations.) 18 



The Small Poplar Longicorn. Sapeyda populnea, Linn. 



(Illustrations.) 19 



The Pine Beetle. Myelophilus piniperda, Linn. (Illustrations.) ... 19 



The Ash Bark Beetle. Hylescimts fraxini, Pz. (Illustrations.) ... 20 



The Cabbage Gall Weevil. Ceuthorhynchus sulcicollis, Gyll. 



(Illustrations.) 21 



The Currant Clearwing. Sesia tipuliformis, Linn 22 



