CONTENTS. 341 



The Pit Vipers — family CrofoJida'—ContuineA. Page. 



The Copperhead — Ai/kistrodou contort rix 401 



Synonymy 101 



Figures 402 



Remarks to syuony my 402 



Description 402 



Variation 404 



Geographical distribution 404 



Habits 405 



The Water Moccasin — Agkintrodon piscivoriin 406 



Synonymy 406 



Figures 406 



Description 407 



Variation 408 



Geographical distribution 408 



Habits 408 



Genus Sistrarus 410 



Synopsis of species in the United States 410 



The Massasauga — Sistrurus catenatus 411 



Synonymy 411 



Figures 412 



Description 412 



Variation 413 



Geographical distribution 413 



Habits 414 



The Gulf-coast Massasauga — Sistrurus catenatus consors 415 



Synonymy 415 



Figures 415 



Remarks 415 



Description 415 



Edwards' Massasauga — Sist^'urus calenatus Edwardsii 416 



Synonymy 416 



Figures 417 



Description 417 



Variation 417 



Geographical distribution 417 



Habits 418 



The Ground Rattlesnake — Sistnirus miUarinn 418 



Synonymy 418 



Figures 418 



Description 418 



Variation 419 



Geographical distribution 420 



Habits 420 



Genus Crotahts 421 



Synonymy 421 



Geographical distribution 421 



Synopsis of species in United States 423 



The Dog-laced Rattlesnake — Crotalns inolossua 424 



Synonymy 424 



Figures 424 



Description 424 



Variation 425 



Geographical distribution 426 



Habits 426 



