of the upper jaw; Family Elapidae Coral Snakes 119. 



Color not so; no poison fangs so situated; non-poisonous and semi' 



poisonous snakes; Family Coluhridae (part) 122. 



119. With a yellow cross band on the head, followed by a red ring; yellow 



rings on body three or more scales wide; N. M., Ariz, and S. Idaho 

 Micruroides eiiryxanthus (Kennicott) Sonora Coral Snake 

 With a yellow cross band on the head and a black ring behind it; yellow 

 rings on body one or two scales wide 120. 



120. Red areas relatively clear; S. Florida 



Mjcrurus fidinus harhonri Schmidt Florida Coral Snake 

 Red areas dark spotted 121. 



121. Red areas irregularly dark spotted; Miss, to Texas 



Micrurus fulvius tenere (B. & G.) Southern Coral Snake 

 Usually with two dark areas or spots on each red band; Ind. to the Gulf, 

 and eastward in the coastal states to N. C. and Fla. 



M\crurns fulvius fulvius (Linn.) Common Coral Snake 

 (Elaps fulvius (Linn.) ) 



122. Snout very long and slender, with distance from eye to end of snout 



about four times as long as the eye; tail more than one.'third total 

 length; with poison fangs in the back part of the upper jaw; color 

 reddish; belly white striped; Ariz;. 



Oxyhelis microphthalmns B. & A. Arizona Vine Snake 

 Not so 123. 



123. With some or all of the scales of the back keeled 124. 

 Scales of back smooth (scales of tail smooth or keeled) 152. 



124. Rostral plate with a ridge above and turned up at the end Hog-nosed 



Snakes, Puffing Adders, Sand Vipers or Flat -nosed Adders 125. 



Rostral plate not so 129, 



125. Prefrontals adjacent; light areas usually dark dotted 126. 

 With small scales between the prefrontals; light areas clear 127. 



126. Usually no small scale behind the rostrum, separating the internasals; 



mid-dorsal dark blotches less than 20; Fla. (See note at end of chap' 

 ter.) 



Heterodon contortrix hroivm (Stejneger) Florida Hog-nosed 

 Snake 

 With a small scale (azygous) behind the rostrum, separating the inter- 

 nasals; mid-dorsal dark blotches often more than 20, or sometimes the 

 back is entirely dark; N. H. to Minn., and southward 



Heterodon contortrix contortrix (Linn.) Puffing or Spreading 



Adder, Common Hog-nosed Snake 

 (Heterodon platyrhinos of Cope) 



127. Middle of belly light; Ind. to N. C. and Fla. 



Heterodon sinius (Linn.) Southern Hog-nosed Snake 

 With a black area lengthwise along the middle of the belly 128. 



128. With six or less small scales around the azygous (small scale behind ros- 



trum) ; belly mostly dark; southward from Ariz, to Texas 



409 



