Phyllorhynchus decurtatus nuhilus Klauher 

 Cloudy Leaf-nosed Snake 

 With 34 or less dark blotches along the middle of the back 54. 



54. Dorsal blotches about as far apart as the depth (lengthwise) of the 



blotches; Lower Cal. into Ariz. 



Phyllorhynchus decurtatus decurtatus (Cope) 

 Peninsula Leaf-nosed Snake 

 Dorsal blotches farther apart than the depth of the blotches; S. Cal., Nev. 

 and Ariz. 



Phyllorhynchus decurtatus per\insi Klauber 

 Perkins' Leaf-nosed Snake 



55. Scales of back keeled 56. 

 Scales of back smooth (scales of tail smooth or keeled) 9L 



56. With 25 or more rows of scales around the body anteriorly or in the 



middle (usually 29 to 35); usually light-colored, with dark blotches, 



above, or sometimes completely dark Bull Snakes 57. 



With 23 or less rows of scales around the body (not counting the ventral 



plates) ; striped, with rows of small spots, or solid dark color above 66. 



57. With two upper labial plates touching the eye on each side; normally 



with two prefrontal plates; a Mexican species which extends into S. 

 Texas and Cal. 



Pituophis deppei deppei (D. ^ B.) Mexican Bull Snake 

 {Epiglottophis pleurostictus of Cope) 

 With one or no upper labial touching the eye on each side; normally 

 with four prefrontal plates 58. 



58. With less than 38 well separated dorsal blotches (on back and tail) or 



sometimes completely dark; width of rostrum about one-half height; 

 head spotted, but without bands or stripes 59. 



With more than 38 mid-dorsal blotches only three or four scales apart; 

 width of rostrum more than one'half height; head with a band or 

 bands 6L 



59. Black above, gray below; adjoining sections of Ala. and Miss. 



Pituophis melanoleucus lodingi Blanchard Black Pine Snake 

 Brownish or light above, with dark blotches 60. 



60. Brownish above, with obscure blotches; Fla. 



Pituophis melanoleucus mugitus Barbour Florida Pine Snake 

 Whitish above, with distinct dark blotches; Tenn. to N. Y. and S. C. 



Pituophis melanoleucus melanoleucus (Daudin) Common Pine 

 Snake 



61. Rostral plate noticeably narrower than high; yellowish, with dark 



blotches on the back, and a noticeable row of smaller dark spots along 

 each side; Ind. to Cal. 62. 



Rostral plate about as wide as high; yellowish, with dark blotches on the 

 back; smaller dark spots along each side often obscure; Colo, west' 

 ward 63. 



62. Dorsal blotches squarish; Wis. and Ind. to the Rockies, and southward 



into Mexico 



398 



