VI CONTENTS 



Page 



Malacosoma americanum (Fabricius) Ill 



The western tentbuilders — a comparison of Malacosoma californicum and 



Malacosoma incurmm in the southwestern United States 118 



Malacosoma californicum (Packard) 123 



The Mendocino-Trinity population 129 



The Aspen populations 130 



Possible relationships between the Aspen populations of M. califor- 

 nicum and populatloiis of M. incurvum 134 



Malacosoma californicum californicum (Packard) 138 



Malacosoma californicum ambisimile (Dyar) 142 



Malacosoma californicum recenseo Dyar 148 



Malacosoma californicum pluviale (Dyar) 1 52 



The bog populations of A/. fo/i/bmcMm /)/uz;2a/^ 156 



Malacosoma californicum lutescens (Neumoegen and Dyar) 1 60 



Malacosoma calif ornicum fragile (Stretch) 164 



Malacosoma incurvum (Henry Edwards) 169 



Malacosoma incurvum incurvum (Henry Edwards) 173 



Malacosoma incurvum discolor alum (Neumoegen) 177 



Malacosoma incurvum aztecum (Neumoegen) 183 



The Palearctic species and a brief comparison with the North American 



species 187 



The relationships between the North American species 190 



Literature cited 193 



Illustrations 201 



Appendix I — Collection Data 253 



Appendix H — Explanatory notes on North American Malacosoma 



types 283 



Appendix IH — Common names of Malacosoma species 289 



Appendix IV — Parasites 291 



Index 303 



Host Plant Index 316 



Parasite Index 320 



