45. Dark dorsal saddles usually with a straight edge or two points at each 



end (laterally) ; light interspaces about one-half depth (lengthwise) of 

 dark saddles, white and almost clear; Ariz., Nev. and S. Cal. 



RhinocheUus lecontei clarus Klauber Banded Long-nosed Snake 

 Dark dorsal saddles coming to a single point at each end; light inter- 

 spaces usually more than one-half depth of dark saddles, cream-colored, 

 often red-tinted and usually much spotted laterally 46. 



46. End of snout turned upwards, with the margin of the rostral plate raised 



above the surrounding scales; Kansas to Texas and N. M. 



Rhinocheilus lecontei tesselatus Garman Spotted Long-nosed 

 Snake 

 Margin of the rostral plate on the same plane as the surrounding scales; 

 Idaho to Aris. and Cal. 



RJnnocheilus lecontei lecontei B. & G. LeConte's Long-nosed 

 Snake 



47. With a large plate on top of the head between the eyes; back grayish 



or brownish; belly clear yellow; Wash, and Mont, to Cal. and Utah 

 Charina hottae (Blainville) Rubber or Ball Snake 

 With many small scales on top of the head between the eyes; back gray- 

 ish or brownish, often with three lengthwise stripes; belly reddish or 

 yellowish, with brown markings 48. 



48. Dorsal stripes zigzag and often obscure; Cal. 



Lichanura roseofusca roseofusca (Cope) California Rosy Boa 

 Dorsal stripes almost straight, but with serrate margins, and usually quite 

 distinct; Cal. and Ariz. 



Lichanura roseofusca gracia Klauber Desert Rosy Boa 



49. With a single large plate before and below the anus; Family Coluhridae 



(part) 50. 



With a divided large plate before and below the anus 118. 



50. With a flat, triangular plate at the end of the snout, with prominent, 



projecting edges like a protecting shield; pupil of eye vertical; with a 



row of small scales between the eye and the upper labials 51. 



Plate on end of snout normal; pupil of eye round, except in Trimorpho' 



don; eye adjacent to one or more of the upper labials 55. 



51. With less than 17 dark blotches along the middle of the back (not count- 



ing the tail) 52. 



With more than 17 dark blotches along the middle of the back 53. 



52. Dorsal blotches much nearer together than the depth (lengthwise) of 



the blotches; S. Ariz. 



Phyllorhynchus browni hrowni Stejneger Brown's Leaf-nosed 

 Snake 

 Dorsal blotches scarcely nearer together than the depth of the blotches; 

 Maricopa Co., Ariz. 



Phyllorhynchus hroumi lucidus Klauber Maricopa Leaf-nosed 

 Snake 



53. With 35 or more dark blotches along the middle of the back; around 



Tucson, Ariz. 



397 



