Color pattern distinct; gro"anci color pale "broivn (in Texas grad- 

 ing into pale green on tail), mth large dorsal "blotches 

 of darker chestnut hrovzn (usiaally in the form of a hutterfly 

 with outspread wings). Massachusetts to northern Florida, 

 TTestward to Illinois, Kansas, and Texas- 



Copperhead, highland moccasin, chunkhead, 



poplar leaf, or deaf adder — Agkistrodon mokasen, 



Color pattern ohscure; gro'ond color light to dark brown; 

 cross hands darker, often indistinct and "bordered 

 with yelloiT spots; some of ventral scales on tail 

 -undivided. Lowlands from southeastern Virginia to 

 Florida and the Gulf States northward through the 

 Mississippi Yalley to so-atheastern llissouri and 

 southern Illinois. 

 Cotton-mouth water moccaain — Agkistrodon piscivorus. 



Tail with rattle Sistrurus and Cro taliis . 



A single large scale on top of head between supra- 

 ocular scales (those over eyes) Sistrurus_. 



Size small (adu].ts usxially less than 20 inches 

 long); ground color grayish; Large black 

 blotches on back, smaller series on sides. 

 Southeastern ITorth Carolina to Florida, west 

 •; ■■■/ ' . through the Gulf States to western Texas and 

 '■ " Oklahoma, and northwr?..rd through Mississippi 

 basin to Arkj.nsas. 



Gro"and rattler or pigmy rattle- 



snrie — S istruru-s miliarius . 



Size medium (adults usually 25 to 35 inches 

 long); groiind color brownish; large black 

 blotches on back in close formation. Cen- 

 tral Hew York ajQ.d Pennsylvpjiia to south- 

 eastern Minnesota and southwestrard tliro^igh 

 western Texas .and Hew Mexico to northea.st- 

 ern Mexico (us'oa.lly in moist situations) . 

 Massasauga — Sistrurus catenatus . 



Many small scales on top of head betweon supraocular 



scales (those over eyes) . Pro talus . 



-4.- 



