ZAMENIS. 121 
Hab. Mzxico, Colima (U. S. Nat. Mus.), Presidio and Tres Marias Is. (Forrer), Autlan 
in Jalisco, Guadalajara (Buller), Amula in Guerrero (H. H. Smith), Tehuantepec 
(Sumichrast); GUATEMALA, between Coban and Chisec (Hague), San Ger6énimo, 
Vera Paz, Rio Chisoy (Salvin). 
I do not consider the confluence of the two upper labial shields below the eye (as 
found in Z. mentovarius) to be of sufficient importance to justify distinction by a 
binomial term. Black spots at and below the tips of the scales are frequently very 
distinct (Z. lineatus, figured by Bocourt, op. cit. t. 48. fig. 1¢), but are also visible, 
though more faintly, in examples which would be referred to Z. mentovarius. 
5. Zamenis flagelliformis. 
Natrix flagelliformis, Laur. Syn. Rept. p. 79. 
Masticophis flageliformis, Baird & Girard, N. Amer. Rept. p. 98; Jan, Iconogr. Ophid. xx. t. 6. 
Herpetodryas flagelliformis, Dum. & Bibr. Erpét. vii. p. 210; Giinth. Cat. Col. Sn. p. 118. 
Bascanium flagelliforme, Cope, Bull. U. S. Nat. Mus. no. 82, p. 71; and Proc. U.S. Nat. Mus. 
Xlv. p. 625 (1892). 
Zamenis flagelliformis, Boulenger, Cat. Sn. i. p. 389. 
Herpetodryas psammophis (part.), Schleg. Phys. Serp. ii. p. 195; and Abbild. t. 44. figg, 21-24, 
Hab. Norta America, Southern States.—? MExico. 
Cope mentions that he has seen specimens of this species from Guadalajara and 
Chihuahua. I myself have not been able to refer a Mexican specimen to it, if the 
specific characters are admitted to consist of a contracted end of the snout, occipitals 
narrowed behind, seventeen rows of scales, a moderate number of subcaudal scutes (not 
exceeding 112), &c. 
6, Zamenis semilineatus. (Tab. XLVI. fig. A.) 
Herpetodryas flavigularis, var., Giinth. Cat. Col. Sn. p. 118*. 
? Bascanium semilineatum, Cope, Proc. U. S. Nat. Mus. xiv. p. 626 (1892). 
Zamenis teniatus (part.), Boulenger, Cat. Sn. i. p. 390. 
Hab. Nortu America, Arizona (Cope):—MExico, Presidio (forrer). 
Body and tail very slender, the tail being nearly one third of the total length. Head 
rather elongate, flat above, deeply concave in the loreal region. Vertical shield bell- 
shaped, with concave lateral edges; its anterior portion wider than a supra-ocular and 
in contact with the preorbital. Anterior frontals scarcely half the size of posterior. 
Eight supra-labials, the fourth and fifth entering the eye; loreal longer than deep; 
two preoculars, two postoculars; temporals 24-242; occipitals truncated behind ; 
posterior chin-shields longer than anterior, Scales in seventeen rows. Ventrals,196- 
201; anal divided; subcaudals 132-134 (and more, Cope). 
* Where nineteen series of scales have been counted by error. 
BIOL. CENTR.-AMER., Rept., February 1894. *16 
