312 lUinois State Lahomtonj of Nat Krai Uistonj. 



Beneath yellow, more or less blotched and speckled with black 

 at the sides. Head uniform brown above, with a wide brown 

 band extending from the eye obliquely downward and back- 

 ward over the angle of the mouth. Tail black in adults, banded 

 in young. 



Total length of specimen from Mt. Vernon, 40; tail, with 

 nine rattles, 4.50. 



Throughout the State in hilly forest regions, but being 

 rapidly exterminated. Cook Co. (Kennicott), Peoria (Brendel), 

 Wabash Valley (Ridgway), Mt. Vernon, Union Co. 



SiSTRURUS, S. G ARM IN. 



S. Garman, Mem. Mus. Comp. ZoOl., 1883, pp. 110, 176. 



Wagler, Caudisona, Syst. Amph. 1830, p. 176. 



Bd. and Gir., Crotalophorus, Cat. N. A. Rept., Pt. I., 1853, p. 11. 



With large symmetrical cephalic plates. Loreal present. 

 Pit between eye and nostril large. Fangs and poison gland 

 well developed. Supralabials separated from the orbit by two 

 series of small scales. Dorsal scales in twenty-three to twenty- 

 five rows, from one to three outer rows smooth. Subcaudals 

 entire or but few divided. Rattle present. Body stout. Tail 

 short. 



Sistrurus catenatus, Raf. Massasauga, Prairie Rattle- 

 snake. 



Crotalinus catenatus, Raf., Am. Month. Mag., 1818. IV"., p. 41. 

 Crotalophorus tergeminus, Holbr. N. A. Herp., 1842, III., p. 29, pi. 



5.— De Kay, Xat. Hist. N. Y., I., Zool. III., 1842, Rept. and 



Amph. p. 57.— J3d. and Gir., Cat. N. A. Rept., Ft. I., 1853, p. 14.— 



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

 Crotalo2>horvs kirtlandll, Kenn., 1. c— Dum. et Bibr., Erp. Gen. 



VII., Pt. II., 1854, p. 1482. 

 Crotalus tergeminus, Dum. et Bibr., Erp. Gea., VII., Pt. II., 1854, 



p. 1479. 

 Caudisona tergemina, Davis & Rice, Bull. 111. State Lab. Nat. 



Hist., I., No. 5, 1883, p. 28; Bull. Chicago Acad. Sci., 1883. 

 Crotalus catenatus, S. Garman, Mem. Mus. Comp. ZocU., 1883, p. 



118. pi. 9, fig. 2. 

 Sistrurus catenatus, idem, 1. c, p. 176. 



Small. Body fusiform. Head moderately wide. Neck 

 slender. Tail short, scarcely tapering. Dorsal scales carinate 



