CONTENTS. 



Page. 



Introduction 59 



History and extent of the outbreak in New Mexico 60 



Occurrence of the moths outside of New Mexico 62 



The specific identity of the insect concerned 63 



Description 65 



The egg 65 



The larval stages 65 



The pupa 67 



The adult or moth 67 



Life history and habits 69 



The eggs , 69 



Oviposition 69 



Location of the egg masses 71 



Hatching 71 



The larvae 73 



Habits of the young larvae 73 



Habits of the older larvae 74 



Molting 75 



Length of larval stages 76 



Irritating effects of larval spines 76 



Abundance of larvae 77 



Fatal effects of heat on larvae 78 



Food habits and food plants 79 



The pupae 79 



Pupation 79 



Length of pupal stage 82 



The moths 82 



Emergence. 82 



Character of flight , 84 



Attraction to lights 86 



Flight during storms 86 



Color as affected by changes in temperature 86 



Defensive methods 87 



Natural enemies 87 



Insect parasites 87 



Other insect enemies 92 



Mites 92 



Ants found in pupal shells 93 



Birds 93 



Effects on the range caterpillar of pasturing 93 



Remedial measures 94 



in 



