X CONTENTS 



11 Affinities and Origins of the Northern and Montane 



Insects of Western North America 

 Herbert H. Ross 231 



1 2 The Origin and Affinities of the Dermaptera and Orthop- 



tera of \\^estern North America 

 James A. G. Rehn 253 



13 Geographical Origins and Phylogenetic Affinities of the 



Cerambycid Beetle Fauna of Western North America 



E. Gorton Linsley 299 



14 Distribution of Butterflies in the New World 



William Hovanitz 321 



Part II Geographic Distributioji of Contemporary Organisms 

 Introduction E. Raymond Hall 371 



15 Pleistocene Ecology and Biogeography of North America 



Paul S. Martin 375 



16 The Palaearctic Element in the New World Avifauna 



Kenneth C. Parkes 421 



17 Distributional Patterns of Vertebrates in the Southern 



United States in Relation to Past and Present En- 

 vironments 



W. Frank Blair 433 



General Conclusions 



Carl L. Hubbs 469 



Author Index 479 



Index of Scientific Names 487 



