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 23-2-') rows. No suborbital plates present. 



N. SIPEDOX. 



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



N. OYCLOPIUM. 



Nerodia sipedon, Linn. Spotted Water Sn^ake. 

 Var. sipedon. 



Coluber -sipedon, Linn., Syst. Nat., ed. 10, 1758, I., p. 219. 

 Tro])ido not US sipedon, Holbr., X. A. Herp., 1842, IV., p. 29, pi. 6.— 



De Kay, Xat. Hist. N. Y., I., Zoul. III., Rept. and Arapli.. 



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

 Nerodia sipedon, Bd. and Gir., Cat. X. A. Rept., Ft. I., 1853, p. 38ij. 



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

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

 Tropidonotns sipedon. subsp. sipjedon. Davis and Rice, Bull. 111. 



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



Acad. Sci., 1883. 

 Troj)idonotns sipedon, .S. Garman, Mem. Mus. Comp. Zool., 1883, 



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



\'ar. fasciatus. 



('olnhf-r fdsfintn.s. Linn., Syst. Nat., ed. 12, 17W, I., p. 378. 

 Nerodia fusciata. Bd. and Gir.. ('at. N. A. Rept., Pt. I., 1853, p. 39. 

 Tropndonotus fasciatus. Davis and Rice, Bull. 111. State Lab. 

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



Var. erythrogaster. 



Coluber erytliroyujiter. Shaw, Gen. Zoul., III., 1804, p. 458. 

 Nerodia erythrogaster, Bd. and Gir., Cat. N. A. Rept., Pt. I., 1H53, 



p. 40. 

 Tropidonotus sipedon. subsp. f-rythrogaster. Davis and Rice. 



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



rhicago Acad. Sci., 1883. 

 T ropndonotus sipedon. var. erythrogasffr. S. Garman, Mem. 



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



Var. rhombifer. 



Tropidonotus rhombifer. Hallowell. l^roc. Acad. Nat. Sci. Phila., 



VL, 1852, p. 177. 

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

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



Nat. Hist., I., No. 5, 1883, p. 4.3; Bull. Chicago Acad. Sci.. 1883. 

 Tropidonotus sipedon. var. rliombift-r. S. Garman. Mem. Mus. 



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



