SNAKES. 81 



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

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

 North America. 



Ischnognathus. Dum. 4- Bibr. Mem. de Sc. Nat. 1*52, p. 

 and Erpet. Gen. vii. p. 506. Storeria, Baird 4' Girard, Catul. 

 p. 135. Tropidonotus, sp.. Holbrook, Storer. 



1. IsCHXOGXATHUS 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. § 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-macllatus. 



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

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

 iii. p. 274. Storeria occipito-maculata, Baird 4' 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. Murcliison. 



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. 



/. H If-g uii : tail injured. North America. 



g. Half-grown. United Spates. 



h. Adult :": »ood state. North America. From the Haslar < 



lection. 

 i. Adult: greatly injured. North America, 

 k. Adult : bleached." North America. 

 /. Half-crown. North America. 



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



e o 



