670 ■ NORTH AMEEK'AN SNAKES COPE. 



tioi). Euds of gastrosteges yellow on the auterior liltli of the length. 

 10(581:137 + 1+?; IGT""", "?, (tail injured). 



Natrix compressicauda compsolaema Cope. 



Tropidonotm comsolamus Copo, Proc. Acad. Pbila., 18G0, p. IJOH ; Check Li.st N. Am. 

 Batr. Kept., 1875, p. 42. 



Key West, Florida. 



Natrix valida Keuuicott. 

 liegina ralida Kenu., Proc. Acad. Phila., 1860, p. 3;J4. 



Scales iu twenty-oue rows, the inferior smooth. Head distinct from 

 body, elongate and tapering to the muzzle. Inter nasals longer than wide; 

 rostral elevated. Oculars 2-3 and 1-3; temporals 1-2. Superior labials 

 eight, eye over fourth and fifth. Tail not compressed at base. Gray 

 or brown, with more or less distinct small spots on the sides. Belly not 

 spotted. 



There are two subspecies of the Natrix valida, as follows : 



Spots small, no Lauds ; belly pale N. v. valida. 



Lateral spots large; a yertebral dark, aud lateral light bauds; belly dark.. A", r. ceiwuo. 



Natrix valida valida Keun. 



Eegina valida Kenu., Proc. Acad. Phila., 18G0, p. 334. 



Tropidoiiufiis ralidns Cope, Proc. Acad. Phila., 1806, p. 310; Check List Eatr. Rej)t. 



N. Aiiier., 1875, p. 42, Geol. Siirv., W. 100th mer., 1875, p. 612, PI. xxi. 

 Tropidonotus tephrojiletira Co])e, Proc. Acad. Phila., I860, p. 341. 



Lower California, Sonora. 



Natrix valida celceno Cope. 



Tropidonotus cdcvHo Co\)Q, Proc. Acad. Phila., I860, p. 341 ; Tropidonotus validus celteno 

 Cope, Check List N. Am. Batr. Rept., 1875, p. 42. 



Lower California. 



Natrix bisecta Cope. 



TropidonolHH bifuctiix Cope, I'roc. U. S. Nat. Mus. 1887, p. MG. 



Washington, District of Columbia. But one specimen known. 



Natrix fasciata Linn. 



Cope, Proc. U. S. Nat. Mas. 1888, p. 31)2 ; Coluher fasciulus lAus C. siptdon Liuii., Syst. 



Nat. I, 1766, pp. 378-37;); Tropidonof us fasciatus Bi\m. Bibr., Etp, Gen., vn, 1854, 



p. 566: Giinther, Cat. Col. Snakes Brit. Mus., 1858, p. 76. 

 Trojridonotus si2)cdon Cope, Check List Batr. Rept. N. Am., 1875, p. 42. 



Scales in twenty-three or twenty-five rows, all keeled, the external 

 larger than the others. Eight superior labials, center of eye over 



