312 lUiitois St'tte Lahorafori/ of Nafiind lliaiorij. 



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. Gahman. 



S. Garman, Mem. Mus. Comp. Zool., 1883, pp. 110, 17(3. 



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



Bd. and Gir., Crotalophorus, Cat. N. A. Ilept., 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, Puaikik Rattle- 

 snake. 



(JnAalinns catciuUii.s, liaf., Am. Month. Mat?., 1818. IV., p. 41. 

 Crotalophonis tergeinini(s,Ho\br. N. A. llerp.. 1842, 111., p. 29, pi. 



5.— De Kay, Nat. Hist. N. Y., I., Zool. III., 1842, Kept, and 



Amph. p. 57.— P>d. and Gir., Cat. N. A. Ilept., Pt. I.. 1853, p. 14.— 



Kenn., Trans. 111. State Agr. Soc, 1853 54, I., p. 5U2. 

 ('rotiilo/ihonis l;irtl.aii(lii. Kenn., 1. c— I)um. et liibr., Krp. (!t'n. 



VII., Pt. 11., 1854, p. 1482. 

 Crotalns' ieryiini iiiis, Dam. et lUbr., ICip. Grii., VII., PL. II., 1S54, 



p. 1479. 

 Caudisona tciyi tnina, Davis i\i Kice, IJull. 111. State I^ab. Nat. 



Hist., I., No. 5, 1883. p. 28; liuU. Ciiicasco Acad. Sci., 1883. 

 f'rotalifs (■((tciitihi.s, S. Garman, Mem. Mus. Comp. Zoi'il., 1883, p. 



118, pi. It, tig. 2. 

 SisI riinis itili'iiatiis, idem, 1. c. p. 176. 



Small. liody fusiform. Head moderately wide. Neck 

 slender. Tail short, scarcely tapering. Dorsal scales carinate 



