COXTEXTv 



Page. 



Letter of submittal 



Introduction 7 



Four Principal Leaf-eaters 



THE IMPORTED ELM LEAF-BEETLE 8 



ax importation from e orope 



Habits and natural history 



Remedies 11 



More recent experience at the Department 14 



Past history of the elms in question 14 



Condition and characteristics of the grove in 15::2 and 1883 14 



Extent of injury in 1662 and 1663 14 



Preference of the elm beetles for certain varieties 15 



Effects of arsenical poisons on insect and plant 15 



Preventive effects of the poison 16 



Treatment with London purple IT 



Preparation of the poison 1? 



Effects of the mixture „ IT 



Treatment with Paris green 1? 



Mechanical means of applying the jwison 19 



THE BAG-WORM 



Habits and natural history 23 



The eggs 23 



The larva and its bag 



Pupation 



The imago or perfect insect 



Geographical distribution 



Food-plants 



Enemies ■:: 



THE WHITE-MARKED TLSSOCK-MOTH 



Habit- and natural history 



The eggs 



Development and characters of the larva 



Habits of the larva 



A new form of Orgyia attack 



Pupation 



TIi e imago 



Hibernation 



Number of annual generations 



F00D-PLANT> 



Natural enemies and parasites 33 



Geographical DISTRIBUTION 



THE FALL WEB- WO EM 



Natural history 3<J 



Limitation of broods , 



The eggs 



The larva 



Pupa and cocoon 



The moth 



Injury done in 1886 40 



3 



