"18 



AGKISTRODON. 



blotches extend to the vertebral line, where they may be truncated 

 or end in a rounded apex. Generally those of opposite sides alter- 

 nate with each other, but frequently they are confluent above, form- 

 ing continuous bands. They are so disposed, that the intervals 

 between the successive blotches are pretty much of the same shape 

 and size, though inverted. The centres of the blotches are lighter; 

 in some cases so much so as greatly to increase the Y-shaped resem- 

 blance. Color beneath dull yellowish, with a series of distinct large 

 dark blotches, 35—45 in number, on each side. Chin and throat un- 

 spotted. Sides of head cream color; the line of demarcation very 

 distinct ; this passes along the upper edge of the head, in front of the 

 eye, and involving the lower three-fourths of the orbit, intersects the 

 middle of the 2d postorbital plate, (counting from above,) and ex- 

 tends along the 1st row above the labials, to the posterior edge of the 

 last labial ; the line then comes back through the middle of the lower 

 labial range, where it is marked by a narrow black line. Rostral of 

 the same color. A small areolated dark spot near the inner edge of 

 each occipital plate. 



Cleveland. 



ic 



Foxhurg, Pa. 



153. 40+10. 23. 

 152. 42+10. 23. 

 152. 32+18. 23. 

 152.32+18.23. 



271. 

 29. 

 261 

 321. 



3|. 

 41. 

 31. 

 4*. 

 3f. 



Dr. Kirtland. 



S. F. Baird. 



a 



u 



Carlisle, Pa. 

 (I 



Charleston. 



221. 

 28^ 



2f 

 4i. 



II 



2-g-. 



" 150.48. 23. 



154. 42. 23. 



154.48. 23. 



150.40+8. 23. 



Prairie Mer Rouge,La. 153.40+8. 23. 



" *' 150.30+18.23. 



Blotches larger and fewer, about 15 in number, and running more 



upon the abdomen. Vertical plate larger and more acute posteriorly. 



Bet. Indianola <^' 1 i r^n o 



San Antonio. j 

 Sabinal. 150.31+17.23. Hi If. " 



24|. 31 



20J 



201.3 



C. Girard, 

 Jas. Fairie. 



Col. Graham. 



