1901.] NATURAL SCIENCES OF PIIILADELPIIIA. 33 



scales iu 19 nnvs; ventrals 14G-151; subeaiulals 64-86. Dark 

 brown above Avith three narrow longitudinal l)lack stripes on the 

 back; a yellow stripe on the two outer rows of scales ; belly yellow- 

 ish with four black stripes. Length 580 mm, (tail 154). 



Hab. — United States east of the Mississippi; not common in 

 Florida. 

 Tropidonotus graliami B. and G. 



Regina Graliamii B. and G., I. c, 47 ; Natrix r/ra7iamii Cope, I. c, 

 668, and Kep. Nat. Mus., 991 ; T. grahami Boul., I. c, I, 240. 



Size moderate; oculars 2-2 (3); temporals 1-2; upper labials 7; 

 scales in 19 rows (occ. 21) ; ventrals 150-173; subcaudals 45-65, 

 A light brown or clay-colored dorsal stripe, one and a halt scales 

 wide, bordered by a narrow black line; below this, an olive-brown 

 stripe three scales wide, bordered below by another black line on the 

 fourth row; belly and three outer rows straw yellow. There is a 

 narrow black line along the juncture between the ventrals and the 

 outer scale row, and frequently another along the middle of the 

 ventrals. In old individuals the colors darken and the appear- 

 ance is sometimes presented of a brown snake with three narrow 

 black stripes on each side. Length 880 mm. (tail 130). 



Hab. — The Mississippi valley, from Michigan to Texas. 



Tropidonotus rigidus Say. 



Coluber rigidus Say, Jour. Acad. Phila., IV, 1825, 239 ; Regina rigida 

 B. and G., I. c, 49; Nntrix rigida Cope, I. c, 668, and Eep. Nat. 

 Mus., 989; T. rigidus Boul., L c, I, 240. 



Size rather small ; oculars 2-2 ; temporals 1-2 ; upper labials 7 ; 

 19 rows of scales; ventrals 132-142; subcaudals 51-71. 



Greenish brown, with two narrow black stripes on the back; 

 labials and belly yellow, with two series of black spots on the ven- 

 trals, which sometimes merge into a clouded stripe in front and 

 behind. Length 536 mm. (tail 102). 



Hab. — Pennsylvania, south and southwest to the Gulf; rare in 



Florida. 



Tropidonotus clarkii B. and G. 



Regina Clarkii B. aud G., I. c, 48 ; Natrix clarkii Cope, I. c, 669, aud 

 Kep. Nat. Mus., 987 ; T. clarkii Boul., I. c, I, 238. 



Size moderate; oculars 1-3 (2); temporals 1-3 (2); upper 



labials 8 (occ. 7); scales in 19 or 21 rows; ventrals 130-135; 



subcaudals 57-68. 



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