SNAKES. Hi 



two nasals ; no loreal shield ; anal and subcaudal plates two- 

 rowed. Scales elongate, keeled, in fifteen or seventeen rows. 

 North America. 



Ischnognathus, Dum. Sf Bibr. Mem. de Sc. Nat. 1852, p. , 

 and Erpet. Gen. vii. p. 506. Storeria, Baird 4* Girard, Catal. 

 p. 135. Tropidonotus, sp., Holhrook, Storer. 



1. Ischnognathus dekayi. 



Tropidonotus dekayi, Holbr. N. Amer. Herpet. iv. 1. 14 ; Dekay, 

 Fauna New York, Rept. t. 14. f. 30. Tropidonotus saurita, var., 

 Schleg. Ess. ii. p. 321 . Storeria dekayi, Baird 8f Girard, Catal. 

 p. 135. Ischnognathus dekayi, Dum. Sf~ Bibr. vii, p. 507. 



Scales in seventeen rows. Olive-grey or brown, with a whitish 

 vertebral band, margined by irregular small black spots. Head 

 olive, varied with some black spots in the centre of the crown 

 and on the occiput ; neck without white blotch. 



a, b. Adult. Texas. From Mr. Brandt's Collection, 

 c, d. Adult. Texas. From Mr. Cuming's Collection. 

 e. Adult. New Orleans. 

 /. Adult. North America. 



2. Ischnognathus occipito-maculatus. 



Tropidonotus occipito-maculatus, Storer, Rep. Rept. Massach. 

 p. 230. Coluber venustus, Hallow. Proc. Acad. Nat. Sc. Philad, 

 iii. p. 274. Storeria occi])ito-maculata, Baird Sf Girard, Catal. 

 p. 137. Ischnognathus dekayi, var. B, Dum. 4' Bibr. vii. p. 509. 



Scales in fifteen rows. Olive-grey or brown, sometimes with 

 a paler vertebral band, bordered by blackish spots. Head olive, 

 varied with some black spots in the centre of the crown ; three 

 whitish blotches on the occiput and neck. 



a. Adult. North America. Presented by Sir R. I. Murchison. 



b. Adult : bleached. North America. Presented by Dr. Jacob 



Green. 



c. d. Half-grown. North America. 



e. Half-grown, N. America. From Mr. Stevens's Collection. 

 /. Half-grown : tail injured. North America. 

 g. Half-grown. United States. 



h. Adult : good state. North America. From the Haslar Col- 

 lection. 

 i. Adult : greatly injured. North America. 

 k. Adult : bleached. North America. 

 I. Half-grown. North America. 

 m. Half-grown : bad state. North America. 



E 5 



