204 COLUBRID. 
visible from above; internasals broader than long, shorter than the 
prefrontals ; frontal hardly once and a half as long as broad, a 
little longer than its distance from the end of the snout, slightly 
shorter than the parietals; loreal trapezoid, as long as deep; 
one pre- and two or three postoculars; temporals 14+2; seven 
upper labials, third and fourth entering the eye ; four lower labials 
in contact with the anterior chin-shields, which are shorter than 
the posterior. Scales in 19 rows, very strongly keeled, outer row 
perfectly smooth, second row feebly keeled. Ventrals'141-158 ; anal 
entire; subcaudals 46-56. Brown above, scales of the vertebral 
series yellow; a rather ill-defined light lateral streak ; regular dark 
brown cross bars between the light stripes ; head with dark brown 
symmetrical markings; a yellowish streak from the parietals to 
the angle of the mouth; upper lip yellow, the shields edged with 
black ; greyish olive inferiorly, ventrals blackish at the base. 
Total length 370 millim. ; tail 65. 
Mexico. 
a. 9 (V. 141; C. 46). ~ City of Mexico, Mr. Doorman [C.}. 
b. 3 (V. 158; C. 56). 8. Mexico. F. D. Godman, Esq. 
[P.]. 
5. Tropidonotus scalaris. 
Thamnophis scalaris, Cope, Proc. Ac. Philad. 1860, p. 369. - 
Euteenia scalaris, Cope, Proc. Ac. Philad. 1866, p. 306. 
Head narrow, scarcely distinct from neck; eye rather large. 
Rostral broader than deep, visible from above; internasals broader 
than long, shorter than the preefrontals ; frontal twice to twice and 
one fourth as long as broad, much longer than its distance from 
the end of the snout, slightly shorter than the parietals; loreal as 
long as deep or a little deeper than long; one pre- and two or 
three postoculars ; temporals 142; seven upper labials, third and 
fourth entering the eye; four lower labials in contact with the 
anterior chin-shields, which are shorter than the posterior. Scales 
in 19 rows, strongly keeled, outer row smooth or faintly keeled, 
Ventrals 130-145; anal entire; subcaudals 52-75. Brown above, 
with a yellow or orange vertebral line, and a light lateral streak 
on the second or second and third rows of scales; blackish-brown 
cross bars disposed regularly between the light stripes; greyish 
olive or plumbeous grey inferiorly. 
Total length 550 millim, ; tail 125. 
Mexico. 
a..d (V.130; 0.75). Oaxaca. Mr. Hoege [C.]. 
b-d, e. 3 (V. 141, 140; La Cumbre de los Arras- Dr. A. C. Buller 
C.63,71),hgr. 9 (V. _ trados, Talpa Mascota,  [(.]. 
1483; C. 57), & yg. | Jalisco. 
(V. 139; C. 52). 
S-h. 3 (V. 189, 140; C. Colonia Brizuela, Hda. El Dr, A. C. Buller 
C61) & 9 (V. 145; Rosario, Autlan, Jalisco. [O.]. 
