582 VIPERID 2. 
— (Se. 23; V.147; Orizaba, Vera Cruz. 
. 24). 
ef. 2 (Sc. 21; V. 184; Omilteme, Guerrero. Mr. H. H. Smitk 
C. 19) & yg. (Se. 21; [C.j; F. D. God- 
V. 177; C. 24). man, Esq. [P.]. 
(Types of C. omii «3.) 
g. 2 (Sc. 23; V. 142; 8S. Mexico. PP: Godman, Esq- 
C. 80). ]. 
h. Yg. (Sc. 21; V.150; Mexico. M. Salis [C.]. 
C. 25). 
9. Crotalus polystictus. 
Crotalus lugubris, part., Jan, Rev. § Mag. Zool. 1859, p eer ; 
91, and 1866, 
Caudisona polysticta, Cope, Proc. Ac. Philad. 1865, p. 
Coptalen Tad var. multimaculata, Jan, Icon. Gén. 46, pl. iii. 
fig. 3 (1874). 
—— jimenezii, Duges, Naturaleza, iv. 1876, p. 23, pl. i. figs. 18-20. 
—— polystictus, Cope, Proc. Amer. Philos. Soc. xxii. 1885, p. 179; 
Dugés, Naturaleza, (2) i. 1888, p.134; Cope, Proc. U.S. Nat. Mus. 
xiv. 1892, p. 689; Giinth. Biol. C.-Am., Rept. p. 192 (1895), 
Closely allied to C. triseriatus, but four internasals, 14 or 15 
upper labials, and scales in 27 to 30 rows. Ventrals 123-151 ; 
subcaudals 18-23. Elegantly marked with six or seven longi- 
tudinal series of alternating elongate dark brown, black-and-white 
edged spots separated by narrow interspaces of the yellowish-brown 
ground-colour ; a pair of diverging dark bands on the top of the 
head, divided by a light line across the supraocular shields, an 
oblique dark band below the eye and another from the eye to the 
angle of the mouth; these dark bands separated by narrow pinkish- 
white streaks; pinkish or yellowish beneath, spotted with dark 
brown. 
Total length 600 millim. ; tail 60. 
Tableland of Mexico, 
10. Crotalus lepidus. 
Caudisona lepida, Kennicott, Proc. Ac. Philad. 1861, p. 206. 
Aploaspis lepida, Cope, Proc. Ac. Philad. 1866, p. 310. 
Crotalus lepidus, Cope, Proce, Ac, Philad. 1883, p. 13; Garm. N. 
Am. Rept. p. 117 (1883); Cope; Proc. U.S. Nat. Mus. xiv. 1892, 
Pot Steyneger, Rep. U.S. Nat. Mus. f. 1893, p. 452, pl. xvi- 
-—— palmeri, Garm, Bull. Essex Inst. xix. 1887, p. 124. 
Canthus rostralis obtuse. Rostral broader than deep, in contact 
with the nasal, which is semidivided ; upper surface of snout with 
eight small smooth shields; supraoculars as broad as the space 
between them, which is occupied by three series of scales ; upper 
preocular divided vertically ; two series of scales between the eye 
and the labials ; 12 upper labials. Scales in 21 or 23 rows, dorsals 
strongly keeled. Ventrals 153-169 ; anal entire; subcaudals 24-31. 
Brown or greenish grey above, with distant dark brown or jet-black 
