CONTENTS 



Page 



Introduction 1 



Material and acknowledgments 2 



Abbreviations and measurements 3 



Differential characters of the American species of Myotis 4 



List of the forty-six recognized forms of American Myotis, with their 



type localities 10 



Geographical relations of the American species of Myotis 11 



Nomenclature of the American species of Myotis 15 



The Genera Myotis and Pizonyx and their American species 30 



Genus Myotis 30 



Genus Pizonyx 33 



Key to the American species and subspecies of Myotis and Pizonyx__ 34 



Species of Myotis occurring in Temperate North America 38 



Myotis lucifugus 38 



Myotis lucifugus lucifugus 48 



Myotis lucifugus alascensis 47 



Myotis lucifugus carissima 50 



Myotis lucifugus phasma 53 



Myotis lucifugus fortidens 54 



Myotis yumanensis 61 



Myotis yumanensis yumanensis 65 



Myotis yumanensis sociabilis 68 



Myotis yumanensis saturatus 70 



Myotis yumanensis lutosus 72 



Myotis austroriparius 76 



Myotis grisescens 80 



Myotis velifer 86 



Myotis velifer velifer 89 



Myotis velifer Incautus 92 



Myotis velifer peninsularis 93 



Myotis occultus ^^-^.»^_ji^_' 97 



Myotis keenii 101 



Myotis keenii keenii 104 



Myotis keenii septentrionalis 105 



Myotis evotis 111 



Myotis evotis evotis 114 



Myotis evotis chrysonotus 116 



Myotis milleri 118 



Myotis thysanodes 122 



Myotis thysanodes thysanodes 126 



Myotis thysanodes aztecus 128 



Myotis sodalis 130 



Myotis volans 135 



Myotis volans volans '. 139 



Myotis volans longicrus 140 



Myotis volans interior 142 



Myotis volans amotus 145 



