I. THE LIFE-HISTORY AND ANATOMY OF BUTTERFLIES 3-25 _The Eggs of Butterflies. Caterpillars_: Structure, Form, Color, etc.; Moults; Food of Caterpillars; Duration of Larval State; Transformation. _The Pupa, or Chrysalis_: The Form of Chrysalids; Duration of Pupal Life; The Transformation from the Chrysalis to the Imago. _Anatomy of Butterflies_: The Head; The Thorax; The Abdomen; The Legs; The Wings; Internal Organs; Polymorphism and Dimorphism; Albinism and Melanism; Monstrosities; Mimicry. _The Distribution of Butterflies._ II. THE CAPTURE, PREPARATION, AND PRESERVATION OF SPECIMENS 26-57 _Collecting Apparatus_: Nets; Collecting-Jars; Field-Boxes; The Use of the Net; Baits; Beating. _The Breeding of Specimens_: How to Get the Eggs of Butterflies; Breeding-Cages; How to Find Caterpillars; Hibernating Caterpillars. _The Preservation of Specimens_: Papering Specimens; Mounting Butterflies; Relaxing Specimens; The Preparation and Preservation of Butterfly Eggs; The Preservation of Chrysalids; The Preservation of Caterpillars. _The Preservation and Arrangement of Collections_: Boxes; Cabinets and Drawers; Labeling; Arrangement of Specimens; Insect Pests; Greasy Specimens; Mould; Repairing Specimens; Packing and Forwarding Specimens; Pins; The Forceps. III. THE CLASSIFICATION OF BUTTERFLIES 58-68 The Place of Butterflies in the Animal Kingdom; The Principles of Scientific Arrangement; The Species; The Genus; The Family, etc.; Scientific Names; Synonyms; Popular Names. IV. BOOKS ABOUT NORTH AMERICAN BUTTERFLIES 69-74 Early Writers; Later Writers; Periodicals. THE BOOK PAGE THE BUTTERFLIES OF NORTH AMERICA NORTH OF MEXICO. Family I. _Nymphalidae_, the Brush-footed Butterflies 77 Subfamily _Euplaeinae_, the Milkweed Butterflies 80 Subfamily _Ithomiinae_, the Long-winged Butterflies 85 Subfamily _Heliconiinae_, the Heliconians 91 Subfamily _Nymphalinae_, the Nymphs 93 Subfamily _Satyrinae_, the Satyrs, Meadow-browns, and Arctics 197 Subfamily _Libytheinae_, the Snout-butterflies 226 Family II. _Lemoniidae_ 228 Subfamily _Erycininae_, the Metal-marks 228 Family III. _Lycaenidae_ 236 Subfamily _Lycaeninae_, the Hair-streaks, the Blues, and the Coppers 236 Family IV. _Papilionidae_, the Swallowtails and Allies 272 Subfamily _Pierinae_, the Whites, the Sulphurs, the Orange-tips 272 Subfamily _Papilioninae_, the Parnassians and Swallowtails 304