43. TANTILLA 883 
internasals, a pair of prefrontals, a frontal, the supraocular 
of each side, and a pair of parietals. Posterior nasal in con- 
tact with preocular. No loreal. One preocular. Two post- 
oculars. Temporals elongate, 1+1. Supralabials seven, the 
last largest, the third and fourth reaching eye. Infralabials 
seven or six, the first pair not, or but just meeting on the 
midline. Anterior genials elongate, posterior much shorter. 
Scales smooth, in fifteen rows. Anal divided. Gastrosteges 
varying in number from 148 to 157. Urosteges in two 
series of about 58. 
The general color above is pale brownish gray or hair 
brown. The top and sides of the head are dark brownish 
gray or slate, the labials being light in color. A whitish 
transverse collar crosses the nape, involving the posterior 
portion of the parietals and about two rows of scales on the 
neck. It is about as wide as the length of two or three 
scales, and is bordered behind by a dark band of brownish 
gray about the width of one or one and a half scales, and 
may be edged with dark brown anteriorly. The color below 
is coral red, becoming grayish white in alcohol. 
Mhenpthntopamus setae oe ee AS 22; 
Wenpthyofmtatlas scm woroe ee nes tee eee ee 5 
Distribution —This snake is known only from three 
specimens from the Huachuca Mountains, Cochise County, 
and one from Mowry, Patagonia Mountains, Santa Cruz 
County, Arizona. 
Remarks.—Nothing is known regarding the habits of 
this snake. The single specimen in the collection of the 
California Academy of Sciences was removed from the 
stomach of a Diadophis regalis caught in Ramsey Canyon 
late in the afternoon of July 29, 1912. This snake may be 
distinguished from the other members of the genus which 
