FROM TEXAS AND MEXICO. 125 



in the rattle there are nine nearly equal rings, some having 

 been lost. From this it is evident the snake was full grown 

 and belonged to a small species. 



This form is closely allied to C. tigris Kenn., in which it 

 is placed as a variety. 



Sibon septentrionale Kenn., SJ)., 1859. 



San Luis Potosi, Mexico. 



Dorsal rows twenty-five ; ventrals two hundred and 

 Beven; anal bifid; subcaudals seventy-two pairs; white 

 transverse hands twenty-six on body, ten on tail; total 

 length nine and seven-eighths inches ; tail two. 



Kegina mesomelana Jan, 1863. 



San Luis Potosi, Mexico. 



The dorsal rows are nineteen in each case ; ventrals 

 one hundred and forty-nine, one hundred and fifty-five, one 

 hundred and fifty-nine ; subcaudals, in the only one entire, 

 sixty-two pairs. On one the lower anteorbital is fused with 

 the loreal on both sides of the head. One has the outer 

 two and a half rows of lighter color; others have a light 

 line on the second ami third rows and below it a brown 

 one on the first. The median line of olive brown on the 

 belly varies greatly in width. 



Eut.enia proxima Say; B. & G. 



Georgetown, Texas. 



Dorsal rows nineteen ; ventrals one hundred and seventy- 

 one ; subcaudals one hundred and five pairs; total length 

 nine and seven-eighths inches, body seven. 



Kit 1 ma marciana B. & G., 1853. 

 San Luis Potosi, Mexico. 

 Dorsal rows twenty-one ; ventrals one hundred and fifty- 



