181 



The scales are arranged in 19 rows. A^entral plates 132 to 135 ; sub- 

 caudals 52 to 71. The outer row of scales is smooth, the second nearly 

 so. The ground-color is greenish brown. The middle of the back is of 

 the groundcolor, but on each side of this there is a narrow dark stripe, 

 which centers on the 8th row of scales. These stripes are usually dis- 

 tinct. Along the flanks, lying on the 2d row of scales, is a baud of pale 

 color. The belly is yellowish, with two rows of dark spots, which lie 

 close together and run from the throat to the vent. Upper jaw, lower 

 jaw and throat yellow. 



A specimen with 170 ventrals, from Illinois, on which, in Jordan's 

 Manual, I assigned rigida to that State, seems to be rather a specimen of 

 N. grahamii. 



Natrix grahamii, (B. & G.). 

 Graham's Water Snake. 



Regina grahamii, Baird and Girard, 1853, 6, 47 ; Tropidonotus grahamii, 

 Giinther, 1858, 26, 78; Tropidonotus leberis, var. grahamii, Garman, 

 18-3, 13, 28; Natrix grahamii, Cope, 1892, 3, 668. 



This species occurs from Michigan to Louisiana and Texas. It is there- 

 fore certain to be found in Indiana, though no one has yet recorded it. 



The rows of scales are 19, and ail keeled ; and the number of ventral 

 plates is greater than in the related species, being from 160 to 170. Pairs 

 of subcaudals about 60. 



The general color is brown. The middle of the back has a pale band 

 occupying 3 scales in width. Outside of this, on the 8th row of scales, 

 is a narrow dark stripe. On each flank, occupying the three outer rows 

 of scales, is a pale streak. Both above and below this is a very narrow 

 dark stripe. The belly is uniform yellow, except that in the middle line, 

 along the hinder portion of the body, there is a dusky stripe. 



The eggs of N. grahamii (taken from the oviducts) were found to be 

 1.5 inch long by .75 in the short diameter. The young, taken from such 

 an egg, was 7 inches long, and was partly enclosed in a sort of concave 

 disk formed of the remains of the yolk. The stripes of the young were 

 much more distinct than those of the adult, and the determination of the 

 species was less difiicult. The young are no doubt brought forth alive 

 and active, 



Natrix cyclopion, (Dum. & Bib.) 



Florida Water-snake. 



Tropidonotus cyclopion, Dumeril & Bibron, 1854, 74-, vii, 576; Garman, 

 1883, 13, 26, pi. 2, fig. 4; Natrix cydopium. Cope, 1892, 3, 673. 



Natrix cyclopion is best known as a Floridan snake ; but it has been 



