The Shipley Collection of Scientific Papers, Volume 164

abdomen abdominal segment abundant adult antennæ ants aphid Aphis Appearance apple arsenic attacked body breeding brood buds California caterpillars cells cent citrus cocoons colonies color Commissioner cornicles cyanide damage dark brown deposited destructive Distribution dorsal early eggs Entomologist erichsonii Family feed femora flies foliage Food Plants Formica fruit fumigation gallons genus green hatch head hibernate History horticultural host inch long infested injurious instabilis ladybird beetle larch Larch Sawfly large numbers larva larvæ lateral leaves legs Linn louse maggots male mealy bug mermithergates mites mosquitoes moth muscles Natural Enemies nest numbers observations Orasema orchards ovipositor P. C. Jr parasites Paris green pest Pheidole plant lice Plate Polyederkrankheit pound pseudogynes pupa pupæ pupal pupate quarantine queen Raupen sawfly scale insects southern species specimens spiracles spray spring stage summer surface thorax thrips trees usually ventral winged female winter workers yellow young