32 EUTAINIA. 



tween the stripes bright olivaceous, in which on each side is indis- 

 tinctly seen a series of rather large spots, about 74 in number from 

 head to anus, and ranged just above the lateral stripe. Abdomen, 

 and below the lateral stripes greenish white, not materially differing 

 from the stripes in color, only rather darker. Sides of abdominal 

 scutellae, and the upper basal edge of the scales in the exterior dorsal 

 row margined with black. A series of black dots on each side of the 

 abdominal scutella3 at the base. The scales in the exterior dorsal 

 row acutely emarginated, as are some of those in the 2d row. 



A specimen collected between Monclova, Mexico, and the Rio 

 Grande, by General Churchill. 



Rio Grande, Texas. 166. 81. 19. 25^ 61. Gen. S. Churchill. 



10. Eutainia ordinata, B. & G.— Olive, with three distinct rows 

 of square dark spots on each side : about 85 from head to anus. Lateral 

 stripe wanting ; dorsal, very indistinct. 



Syn. Coluber ordinatus, Linn. Syst. Nat. I, 1766, 879. — Gm. Linn. Syst. 

 Nat. ed. xiii, I, iii, 1788, 1097.— Harl. Journ. Acad. Nat. Sc. Philad. V, 

 1827, 349. 



Tropidonotus ordinatus, Holbr. N. Amer. Herp. Ill, 1842, 45. PI. xii. 



Vipera gracilis maculatus, Catesb. Nat. Hist. Carol. II, 1743, 51. LI. 



Vipera viridis maculatus, Catesb. Nat. Hist. Carol. II, 1743, 53. LIII. 



Garter Snake, or Grass Snake. 



General color greenish brown or olive. Vertebral yellowish line 

 more or less inconspicuous. Lateral stripe on the 2d and 3d rows 

 of scales very little evident. In fact it might be almost said to be 

 wanting, but for a faint trace. Three series of small square dark 

 blotches on each side, about 85 in number from head to anus. The 

 first is on the outer row of dorsal scales, involving the edges of the 

 contiguous scales. The second on the 4th row ; the third on each 

 side of the dorsal stripe, both like the first, involving the edges of, 

 and intervals between the contiguous scales ; indeed, on stretching 

 apart the skin, the black spots are seen to be converted into a net- 

 work of black along the skin. Beneath greenish white, with spots 

 of black near each end of the abdominal scutellae. Upper labial 

 plates all prominently edged vertically with black. 



This species strongly resembles E. sirtalis, especially the spotted 

 varieties. It may, however, be readily distinguished by the three 

 regular series of tessellated black spots on each side, their promi- 



