288 COLTJBKIDiE. 



Eostral broader than deep, visible from above ; nasal divided or 

 semidivided, in contact with the prseooulars ; internasals broader 

 than long, shorter than the prsefrontals ; frontal about once and a 

 half as long as broad, longer than its distance from the end of the 

 snout, shorter than the parietals ; two prse- and two poatoculars ; 

 temporals 1 + 2 ; six upper labials, third and fourth entering the 

 eye ; four lower labials in contact with the anterior chin-shields ; 

 posterior chin-shields shorter than the anterior and iu contact with 

 each other. Scales in 15 rows, all keeled. Ventrals 110-128 ; 

 anal divided ; subcaudals 38-52. Olive-brown above, usually with 

 a lighter vertebral stripe bordered by two series of dark dots or by 

 two dark brown lines ; a more or less distinct dark lateral line, 

 below which the sides and the outer ends of the ventrals are speckled 

 or vermiculate with black ; three yellow spots behind the shielded 

 part of the head ; belly yellowish or coral-red in the middle. 



Total length 320 millim. ; tail 60. 



Canada and United States, east of the Kocky Mountains. 



a. Hgr. (V. 125 ; C. 38). Nova Scotia. J. M. Jones, Esq. [P.], 



b-d,e,f. 2 (V. 125,127, 128; N.America. 



0. 39, 42, 43) & hgr. (V. 119, 



110 ; C. 50, 50). 



4. Ischnognatlius storerioides. 



Tropidoclonium storerioides. Cope, Proc. Ac. Philad. 1866, p. 190. 



Storeria storerioides, Qarm. N. Am. Pept. p. 29 (1883). 



Natrix storerioides, Cope, Proc. U.S. Nat. Mm. xi. 1889, p. 891. 



Rostral just visible from above ; nasal semidivided or completely 

 divided ; loreal present, sometimes entering the eye ; internasals 

 broader than long, shorter than the praefrontals ; frontal once and 

 a half as long as broad, a little longer than its distance from the 

 end of the snout, shorter than the parietals ; two prse- and two or 

 three postoculars ; temporals l-|-2; six or seven upper labials, 

 third and fourth entering the eye ; three or four lower labials in 

 contact with the anterior chin-shields ; posterior chin-shields sepa- 

 rated from each other or in contact anteriorly. Scales in 15 rows, 

 outer row smooth. Ventrals 120-135 ; anal divided ; subcaudals 

 37-51. Olive-brown, reddish or blackish above, with small black 

 spots ; vertebral region occasionally somewhat lighter and crossed 

 by narrow black lines ; a blackish blotch, bifid posteriorly, on the 

 back of the head ; grey or reddish beneath, sides usually speckled 

 with black. yyi/ 



Total length 340 millim. ; tail 65. 



Mexico. 



a. $ (V. 129 ; C. 41). Plateau of Mexico. Mr. Doorman [P.]. 



b-c, d-i. S (V. 128, 183 ; La Cumbe de los Arra- Dr. A. 0. BuUer 



C. 42, 45), 9 (V. 180, strados, Talpa, JaHs- [C.]. • 



133, 134, 130, 131 ; 0. co, 8500 ft. 



41, 88, 38, 41, 88), & 



yg. (V.135; 0. 40). 



