31. ELAPHE—32. ARIZONA 



outer rows somewhat larger. Anal plate divided. Gastrosteges 

 varying in number at least from 246 to 260. Urosteges in 

 two series of from 107 to 113. 



The color above is uniform greenish olive. On stretch- 

 ing the skin the base of each scale may be seen to be black, 

 with a whitish spot on each side of the scale. The lower 

 parts are uniform whitish, or yellow. There are no definite 

 markings even in young specimens. 



Length to anus 660 965 



Length of tail 280 



Distribution. — Originally described from specimens 

 from Guerrero and Jalisco, Mexico, this snake has since 

 been found in the Santa Rita Mountains, Santa Cruz County, 

 Arizona. Dr. Stone has recorded the two specimens taken 

 there by Dr. H. A. Pilsbry, in 1910. One of these was 

 secured in Agua Caliente Canyon, at an altitude of 6,000 

 feet. 



Genus 32. Arizona 



Ari-zona Kennicott, U. S. Mex. Bound. Surv., Vol. II, 1859, Rept., 

 p. 18 (type, eUgans); Van Denburgh, Proc. Acad. Sc!., Ser. 3, 

 Vol. 4, 1906, p. 66. 



The body is long and slender, with tail of moderate 

 length. The neck is constricted somewhat, so that the head 

 is distinct. The snout is long, rounded, and but little lower 

 than the flat top of the head. The cephalic plates are nor- 

 mal. The nasals rarely unite above the nostril. One (or 

 two) preocular, two (or one) postoculars, and a loreal are 

 present. Temporals are 2+3 or 2+4. The scales are 

 smooth, in 27 to 31 rows. The anal plate is single. Uros- 

 teges are in two series. The eye is moderately large, with 

 pupil nearly round in many alcohol specimens but vertically 

 elliptic in life. 



