MEXICAN SNAKES ANiD CROCODIIilANS — SMITH 395 



separated from parietal by an elongate temporal; otherwise as in 

 neotype. 



The Museum has no others. 



The type is not now in existence, as Duges (1887, p. 20) states, 

 "No tengo en mi poder el cuerpo mismo del reptil, pero he conservado 

 un craneo en muy buen estado ..." A specimen now present in the 

 Duges Museum, Guanajuato, is labeled "Cupataro" (perhaps Tupa- 

 taro, Guanajuato) and is designated neotype. It may be described as 

 follows : 



Head not flattened, somewhat conical; portion of rostral visible 

 from above narrow, but its length about two-thirds length of inter- 

 nasals; latter about a third broader than long, their length slightly 

 less than half that of prefrontals ; latter nearly twice as broad as long, 

 extending onto sides of head between preocular and nasal, in contact 

 with second and third supralabials; greatest width of frontal about 

 three-fifths length of same; posterior angle of frontal nearly a right 

 angle; sides of frontal slightly sinuous; greatest width of a supra- 

 ocular slightly more than greatest width of frontal; greatest length 

 of parietal one and one-half times the greatest length of frontal, their 

 length about equal to their distance from tip of snout. 



Nasal large, its length as great as its distance from orbit, the two 

 separated from each other medially by a distance equal to half the 

 greatest width of an internasal; nasal divided below naris (on one 

 side there is an incomplete suture above the naris), the anterior moiety 

 about half the size of the posterior; no loreal, the prefrontal in contact 

 with labials; one preocular, twice as high as long; diameter of orbit 

 about two-thirds its distance from rostral; pupil round; third and 

 fourth supralabials entering orbit, the third narrowly ; two postocu- 

 lars, the upper about twice as large as lower, which is wedge-shaped ; 

 five supralabials, the last much the largest, its length nearly equal to 

 length of others combined; fifth supralabial broadly in contact with 

 parietals, bordered posteriorly by three scales. 



Labial border of mental apparently slightly greater than that of 

 rostral (a small injury on right side) ; five infralabials, the first in 

 contact with its fellow medially ; fifth inf ralabial as long as the third 

 and fourth combined ; two pairs of chin shields, the posterior slightly 

 the longer and broader than anterior; three scales between chin 

 shields and first enlarged ventral. 



Scale rows 15-15-15 ; dorsal scales keeled, except those of outer two 

 rows on each side; scales of first (outer) row broader than long, 

 those of second row as broad as long and at least twice as broad as 

 scales of inner dorsal rows; some of the scales appear to have two 

 pits, but this cannot be determined because of the flabby character of 



