122 | OPHIDIA. 
A specimen from Presidio, fifty-six inches long, is light olive-coloured, greenish in 
the anterior fourth of the body ; the lower part of the sides is ornamented with narrow 
continuous yellow and brownish lines. They are most distinct in the anterior part of 
the body and disappear in the posterior. One of these yellow lines runs along the 
meeting edges of the outermost and second series of scales, the second along the third 
and fourth series, and both have narrow black or brown edges. The upper labials are 
yellow with black upper margin ; this black margin passes into the black upper edge 
of the outer yellow line. Lower parts yellow, with a few small black spots on the 
lower part of the head. 
Twelve maxillary teeth, of which the two posterior are somewhat separated from, 
but scarcely larger than, the preceding. 
A second specimen, which was probably obtained in North Mexico, scarcely differs 
from the one described, but the lower yellow band is somewhat broader and more’ 
distinct ; and the scales of the back of the posterior part of the trunk. are finely 
mottled with black. 
This form seems to me to come nearest to Bascanium semilineatum of Cope, although 
the description of the colours does not apply in every respect. The “ second ” specimen 
was referred by me at first to H. flavogularis, which, however, seems to have a 
somewhat shorter tail, and has no longitudinal bands on the sides; even now I. have 
some doubts as to the propriety of separating these two forms. Boulenger applies the 
name “¢eniatus, Hallowell,’’ to both these specimens; but, according to the unanimous 
testimony of other authors, teniatus of Hallowell has only fifteen rows of scales, and 
ought to be kept distinct. Also Leptophis lateralis (Hallowell), from California, is, in 
my opinion, a very distinct species, characterized inter alia by a very peculiar physio- 
gnomy, and by the very large size of the anterior frontals. 
7. Zamenis ornatus, (Tab. XLVI. fig. B.) 
Masticophis ornatus, Baird & Girard, Cat. N. Amer. Rept. pp. 102, 159. 
Bascanium ornatum, Cope, Proc. U. S. Nat. Mus. xiv. pp. 622, 629 (1892). 
Zamenis teniatus (part.), Boulenger, Cat. Sn. i. p. 391. 
Hab. Nort America, Texas.—Mexico, Coahuila (W. Taylor). 
This species is distinguished not only by its 15 rows of scales, but by an extremely 
narrow vertical shield, the anterior portion of which is narrower than a supraocular, 
and which is widely separate from the preocular. 
8. Zamenis melanolomus. 
Masticophis bilineatus *, Cope, Proc. Ac. N. Sc. Phil. xviii. p. 127 (1866) (nec Schleg.). 
* Cope introduces also in his list of Central-American Reptiles (Bull. U. §. Nat. Mus. no. 32, 1887, p. 70) 
the true Herpetodryas bilineatus of Schlegel, figured by Jan, Iconogr. Ophid. xxxi. t. 4. fig. 3. But its origin 
