210 COLUBRIDJE. 



of head and lips finely dotted with dark brown ; lower parts uniform 

 white. 



Total length 225 millim. ; tail 57. 



Lower California, California, Arizona, Texas, North Mexico. 



a-b. $ (V. 172, 171; C. Duval Co., Texas. W. Taylor, Esq. [P.]. 



41, 43). 



c. (S (V. 168; C. 45). Nuevo Leon, Mexico. W. Taylor, Esq. [P.]. 



2. Hypsiglena torquata. 



Leptodira torquata, Gunth. Ann. $ Mag. N. H. (3) v. 1860, p. 170, 

 pi. x. fig. A ; Peters, Mon. Berl Ac. i860, jp. 621. 



Comastes quincunciatus, Jan, Elenco, p. 102 (1863), and Icon. Gen. 38, 

 pi. i. fig. 1 (1871). 



Hypsiglena torquata, Cope, Bull. U.S. Nat. Mus. no. 32, 1887, p. 78. 



torquata, part., Gunth. Biol. C.-Am., Rept. p. 137 (1894). 



Snout rounded, obtuse. Rostral nearly twice as broad as deep, 

 the portion visible from above one fourth to one third as long as its 

 distance from the frontal ; internasals shorter than the praefrontals ; 

 frontal once and one third to once and a half as long as broad, as 

 long as or a little longer than its distance from the end of the snout, 

 much shorter than the parietals ; loreal longer than deep ; one prae- 

 ocular, with a subocular below it ; two postoculars ; temporals 1 + 2 ; 

 eight (exceptionally seven) upper labials, fourth and fifth (or third 

 and fourth) entering the eye ; five lower labials in contact with the 

 anterior chin-shields, which are a little shorter than the posterior. 

 Scales in 21 rows. Ventrals 169-174 ; anal divided; subcaudals 

 41-55. Greyish or pale brown above, with a dorsal or two alter- 

 nating dorsal series of large dark brown spots separated by yellowish 

 interspaces ; sides with two or three alternating series of small dark 

 brown spots ; a large dark brown blotch on the nape, preceded by a 

 yellow collar ; a dark brown streak on each side of the head, passing 

 through the eye ; head speckled with dark brown ; lower parts white. 



Total length 400 millim.; tail 60. 



Mexico to Venezuela. 



a. <$ (V. 169 ; C. 53). Ventanas, Durango. Hr. A. Forrer [C.1 



b-c. rf (V. 170, 171 ; Presidio, near Mazat- Hr. A. Forrer [0.1. 

 C. 49, 50). Ian. 



d. $ (V. 174 ; C. 41). Nicaragua. Derby Museum. 



(One of the types.) 



3. Hypsiglena afflnis. (PLATE VIII. fig. 1.) 

 Hypsiglena torquata, var., Gunth. Biol. C.-Am., Rept. p. 137 (1894). 



Agrees in structure and coloration with H. torquata, except that 

 the subocular is absent, the upper labials are seven in number, third 

 and fourth entering the eye, and the scales form only 19 rows. 

 Ventrals 162-168 ; subcaudals 39-51. 



Total length 310 millim. ; tail 52. 



Mexico. 



a. d 1 (V. 164; C. 43). Zacatecaa. J. M. Cameron, Esq. [P.]. 



