12, sistRURUS. 571 
Crotalophorus tergeminus, Holbr. N. Am. Herp. 2nd ed. iii. p. 29, 
pl. v. (1842); Gray, Cat. p. 18 (1849); Agassiz, Lake Superior, 
p- 881, pl. vi. figs. 6-8 (1850); Baird § Gir. Cat. N. Am. Rept. 
p. 14 (1858); Wied, N. Acta Ac.. Leop.-Carol, xxxii. i, 1865, - 
no. 8, p. 74. 
kirtlandii, Holbr. t. c. p. 31, pl. vi.; Gray, 1.¢.; Baird §& Gir. 
1. c. p. 16. 
a itera art., Gray, l.c. p. 17. 
consors, Baird § Gir. 1c. p. 12, and Rep. U.S. Explor. 
Surv. R. R.x., Rept. pl. xxiv. fig. 8 (1859). 
edwardsii, Baird ¢ Gir. ll. ec. p. 15, pl. xxv. fig. 10, and Rep. 
U.S. Mex. Bound. Surv., ii. Rept. p. 15, pl. v. fig. 1 (1859) ; 
Dugés, Naturaleza, iv. 1877, p. 27. 
—— massasauga, Baird, Serp. N. York, p. 12 (1854). 
Crotalus miliarius, vars. edwardsii and tergeminus, Jan, Elenco, p. 124 
(1863), and Icon. Gén. 46, pl. iii. figs. 4 & 6 (1874). | 
Caudisona edwardsii, Cope, Check-list N. Am. Rept. p. 34 (1875). 
tergemina, Cope, l. ¢. 
Crotalus catenatus, Garm. N. Am. Rept. p. 118, pl. ix. fig. 2 (1883). 
Sistrurus catenatus, Garm. l.¢. p. 176; Hay, Batr. § Rept. Ind. 
p. 126 (1892); Stejneger, Rep. U.S. Nat. Mus. f. 1893, p. 411, 
pl. v. (1895). 
Crotalophorus catenatus, Cope, Proc. U.S. Nat. Mus. xiv. 1892, 
p- 685. 
Distinguished from the preceding in having the upper preocular 
in contact with the posterior nasal above the loreal, which is very 
small ; two or three series of scales between the eye and the labials ; 
temporal scales smooth; 11 to 14 upper labials. Scales in 23 or 
25 rows. Ventrals 136-153; subcaudals 20-31. A dark spot on 
the parietal shields, between the two occipito-nuchal stripes; a light 
streak from the loreal pit to the angle of the mouth; dorsal spots 
usually larger than in S. miliarius, transversely elliptic or reniform. 
Total length 680 millim.; tail ‘80. 
Great Lakes district ; United States East of the Rocky Mountains 
and West of the Mississippi; Northern Mexico. 
a. 9 (Sc. 25; V. 143; C. 22). Canada. J. Cruickshank, Esq. [P.1. 
b. gd (Se. 25; V. 139; C.28). Illinois. Smithsonian Instit. 
c. 9 (Sc.25; V. 148; C. 22). N. America, me; 
d. 3 (Sc. 25; V. 146; C.31). ——P 
3. Sistrurus ravus. 
Crotalus ravus, Cope, Proc. Ac. Philad. 1865, p. 191. 
Caudisona rava, Cope, Check-list N. Am. Rept. p. 31 (1875). 
Crotalus miliarius, var. ravus, Garm. N, Am. Rept. p. 120 (1885). 
Crotalophorus ravus, Cope, Proc. Amer. Philos. Soc. xxii, 1885, 
p. 382, and Proc. U.S. Nat. Mus. xiv. 1892, p. 684. 
Canthus rostralis rounded. Rostral broader than deep, recurved 
above ; temporak scald3 smooth; 11 or 12 upper labials. Scales in 
21 or 23 rows, the keels on the median dorsal scales thick. 
Ventrals 147; subcaudals 26. Yellowish brown, with a dorsal 
series of deep brown spots, longer than broad, and a series of trans- 
