CONTENTS 



Page 



Introduction 1 



Genus Pituophis Holbrook 5 



Synopsis of the forms of Pituophis (Table 1) 22 



Key to the forms of Pituophis 23 



Pituophis deppei deppei (Dum6rU and Bibron) 25 



deppei jani (Cope) 42 



lineaticollis (Cope) 47 



melanoleucus melanoleucus (Daudin) 52 



melanoleucus mugitus Barbour 66 



melanoleucus ruthveni Stull 74 



melanoleucus lodingi Blanchard 79 



vertebralis (Blainville) 82 



sayi sayi (Schlegel) 91 



sayi affinis Hallowell 123 



catenifer catenifer (Blainville) 140 



catenifer deserticola Stejneger 166 



catenifer annectens Baird and Girard 185 



General conclusions 204 



Bibliography... 209 



Index 223 



m 



