Reptiles and Amphibians of Illinois. "-'<>*•» 



bitals. Two or three postorbitals. Anal divided. Aquatic 

 serpents of medium size, spotted with black or dark brown. 

 Dorsal scales in 23-2r> rows. No suborbital plates present. 



N. SIPEDON. 



Dorsal scales in 29-^33 rows. Suborbital plates present. 



N. OYCLOPIUM. 



Nerodia sipedon, Linn. Spotted Water Snake. 



Var. sipedon. 



Cohiber si/),^(/on, Linn..Syst. Nat., ed. 10, 1758, I., p. 219. 

 Tropi<lo,wt,issip,(lnn, Holbr., N. A. Herp., 1842, IV., p. 29, pi. 6.- 



De Kay, Nat. Hist. N. Y., I., Zool. III., Kept, and Ampb., 



1842, p. 42, pi. 14, tig. 31. 

 Nerodia ^ii^edon, Bd. and Gir., Cat. N. A. Kept., Ft. I., 1853, p. 38(j. 



— Kenn., Trans. 111. State Agr. See, 1853-54, 1., p. 592. 

 Tropidoiwtns sipedon. Dum.et Bibr., Erp. Gen., 1854. YII., p. 568. 

 Tropidonotusni^edon. subsp. sipedon. Davis and Rice, Bull. 111. 



State Lab. Nat. Hist., I., No. 5, 1883, p. 42; Bull. Chicago 



Acad. Sci., 1883. 

 Tropidonotii.s sipedon, S. Garman, Mem. Mus. Comp. Zo()l., 1883, 



pp. 25, 140, pi. 2, fig. 3. 



Var. fasciatus. 



Coluber fasciatus. Linn., Syst. Nat., ed. 12,1766, I., p. 378. 

 Nerodia fasriata. Bd. and Gir.. Cat. N. A. Kept., Ft. 1., 1853, p. 39. 

 Tropidonotus faseiatvs. Davis and Rice, Bull. 111. State Lab. 

 Nat. Hist., I., No. 5, 1883, p. 42; Bull. Chicago Acad. Sci, 1883. 



Var. erythrogaster. 



doluber erythrogaster. Shaw, Gen. Zo()l., III., 1804, p. 458. 

 Nerodia eri/thr'of/asti^r. Hd. and Gir., Cat. N. A. Rept., Ft. I., 1853, 



p. 40. 

 Tropidonotas sipedon. subsp. erythrogaster. Davis and Rice, 



Bull. 111. State Lab. Nat. Hist., I., No. 5, 1883, p. 42; Bull. 



Chicago Acad. Sci., 1883. 

 Tropidonotus sipedon. var. ergthrogtf^ter. S. Garman, Mem. 



Mus. Comp. Zool., 1883, pp. 26, 141. 



Var. rhombifer. 



Tropidonotas rhombifer. Hallowell. Free. Acad. Nat. Sci. Fhila.. 



VI., 1852, p. 177. 

 Nerodia rhombifer, Bd. and Gir., Cat. N. A. Rept., 1853. p. 147. 

 Tropidonotas rhombifer. Davis and Rice, Bull. 111. State Lab. 



Nat. Hist., I., No. 5, 1883, p. 43; Bull. Chicago Acad. Sci., 1883. 

 Tropidonotus sipedon, var. rhombifer. S. Garman, Mem. Mus. 



Comp. Zool., 1883, pp, 26, 141. 



