G68 NORTH AMERICAN RNAKES COPE. 



II. Temopral scales 2, 4-5; parietals niucli reduced iu size, 

 iX Oculars 1-2 ; scales 31-33 rows. 

 Eye resting on oue labial ; alternating dorsal and lateral square spots which do 

 not touch -lY. taxispiJota. 



Of these species N. leheris and N.fasciata are distributed over both 

 the eastern and the Austroriparian districts. The other species belong 

 to the Austroriparian district, except the N. valida, which is the only 

 species of the Sonoran district. The N. grahamii extends up the Mis- 

 sissippi River to north of the Austroriparian limits to northern Illinois 

 and Indiana, and is not known from east of the latter State. N. rhom- 

 bifera has a similar distribution, except that it remains within the 

 boundaries of the Austroriparian district, not extending north of south- 

 ern Illinois and Indiana. JSf. cycJopium has not been found out of this 

 district, while the iV. compressicauda and N. usta are restricted to Florida. 

 N. taxispUota is confined to the eastern part of the Austroriparian 

 region and Florida; w^hile A. rigida has a similar range, omitting 

 Florida, and apparently extending north to Pennsylvania. A. bisecta 

 is known from but one specimen. 



Natrix leberis Linn. 



Cohdicrhieris Linn., Syst. Nat., Ed. xi, 176G, 216 ; Gmel., Linn. Syst. Nat., Ed. Xlii, Liii, 



17t'e, 1086; Shaw, (.ieu. ZoiA, iii, pt. 2, 1802, p. 433; Daudin, Hist. Nat. Rept., vi, 



1803, 218. 

 Tropidoiioiis leberis Holbr., N. Araer. Herpt., iv, 1842, 118, PI. xii ; Dekay, N. York 



Fauna Rept., 1842, 45; PI. xi. Fig. 23; Dum. Bibr., Erp. Gen., vii, 1854, 579; 



Giiuther, Cat. Col. Snakes, Brit. Mus., 1858, p. 78 ; Jan, Icon. Gen. Ofid., ii, 27, V. 



Fi"-. 2. 

 liegina leheris Bd. and Gird., Cat. Serpt. N. Auier., 1853, p. 45. 

 Coluber sepiemvittdtiis Say, Jonru. Acad. Phila., 1825, p. 243; Harlan, I.e., 1827, p. 355. 



Eastern and Austrorii)arian regions. 



Natrix grahamii Bd. and (iird. 



Befjina {irahamii Bd. and Gird., Cat. Serpt. N. Anier., 1853, p. 47. 

 Tropidotiotiitujrahamii Giiuther, Cat. Col. Snakes Brit. Mus., 1858, p. 78; Cope, Check; 

 List Batr. Rept. N. Amer., 1875, p. 42; Jan, Icon. Gen. Ofid., n, 27, v, Fig. 1. 



Austroriparian region. 



Natrix rigida Say. 



Coluber rigida Say, Journ. Acad. Phila., 1825, p. 3t) ; Harlan, 1. c., 1827, p. 355. 

 Tropidonotus rigidus Holbr., N. Araer. Herpt., 1842, iii, p. 39, PI. x. 

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



Austroriparian region. 



Natrix usta Cope. 



Proc. U. S. Nat, Mus., 1888, p, 392; Tropidonotus ustuaCope, Proc. Acad, Phila., 1860, 

 p. 340. 



Florida. 



