183, SCOLECOPHIS. 211 
Synopsis of the Species. 
Scales smooth; nostril between two : 
nasals; ventrals 181-198 ........ 1. atrocinctus, p. 211. 
Scales smooth; nasal single; ventrals 
152-170... .. 5:4 sie e+ Sinem tas 2. michoacanensis, p. 211. 
Posterior dorsal and caudal scales 
keeled ; nostril between two nasals ; 
ventrals 148... .....-. a adn; Sets 3. emulus, p. 212. 
1. Scolecophis atrocinctus. 
Calamaria atrocincta, Schleg. Phys. Serp. ii. p. 47 (1837). 
Homalocranium atrocinctum, Dum. & Bibr. vii. p. 864 (1854); Jan, 
Icon. Gén. 15, pl. ii. fg. 7 (1866). 
Elaps zonatus, Hallow. Proc. Ac. Philad. 1855, p. 35. 
Scolecophis atrocinctus, Cope, Proc. Ac. Philad. 1860, p. 259; 
Bocourt, Miss. Se. Mex., Rept. p. 577, pl. xxxvii. fig. 2 (1883) ; 
Giinth. Biol. C-Am., Rept. p. 156 (1895). 
zonatus, Cope, J. ¢. 
Eye not quite half as long as the snout. Rostral broader than 
deep, just visible from above; internasals not more than half as 
long as the prefrontals ; frontal longer than broad, as long as or 
longer than its distance from the end of the snout, much shorter 
than the parietals ; nostril between two nasals; loreal as long as 
deep or a little longer than deep; one pre- and two postoculars ; 
temporals 1+ 15; seven upper labials, third and fourth entering the 
eye ; four lower labials in contact with the anterior chin-shields, 
which are longer than the posterior. Scales in 15 rows. Ventrals 
angulate laterally, 181-198; anal divided; subcaudals. 45-54. 
Annulate black and yellow, the black annuli broader than the 
yellow ones; head black above, with a yellow cross-bar on the 
snout, and a yellow spot behind the eye. 
Total length 370 millim. ; tail 47. 
Guatemala. 
a-c. § (V.181; C.47) Duefias, Guatemala. O. Salvin, Esq. [C.]. 
& 9 (V. 198, 188; 
C. 45, 50). 
d, Yg.(V. 193; C.47), —P Dr. Giinther [P.], 
2. Scolecophis michoacanensis. 
Po eae Cope, Proc, Amer. Philos. Soc. xxii. 1885, 
p. 178. 
Homalocranium michoacanense, Giinth. Biol. C:-Am., Rept. p. 150, 
pl. xxxvi. figs. B & C (1895). 
Elapomorphus michoacanensis, Cope, Trans, Amer. Philos. Soc. xviii. 
1895, p. 218. 
Eye nearly half as long as the snout. Rostral broader than deep, 
visible from above; internasals more than half as long as the 
P2 
