676 13. COLV BRIDGE 



Loreal well developed. Preoculars two or one. Postoculars 

 two. Temporals normally two followed by two, sometimes 

 1+2 or 2+3. Supralabials eight (rarely nine or seven), 

 fourth and fifth reaching eye, seventh usually largest. In- 

 ferior labials ten, (rarely nine or eleven), fifth usually 

 largest, first pair meeting on median line. Genials in two 

 pairs, posterior longer. Scales on body smooth, in 1 7 rows. 

 Anal plate divided. Gastrosteges varying in number from 

 195 to 21 1. Urosteges in two series of from 127 to 147. 



The color above, for about the anterior third of the 

 body, is olive or bluish gray, becoming yellowish or grayish 

 brown on the posterior two thirds of the body and on the 

 tail. A few or many of the scales may be marked basally 

 with white or yellow, especially on the anterior half of the 

 body, and throughout the whole length many or almost all 

 of the scales may have central dark markings in the form 

 either of lines or spots. Along the third and fourth rows 

 of lateral scales, anteriorly, is a very distinct and definite 

 clear yellow or white stripe, edged with dark brown, and 

 separated, by a stripe of the ground color, from a second, 

 similar light stripe along the scales of the first and second 

 rows. This lower light stripe sometimes is only partially 

 marked off, by a dark line or row of spots, from the light 

 color of the belly. All these stripes become obsolete and 

 disappear on the posterior half of the body. The head is 

 olive above, grayish posteriorly and brownish toward the 

 snout, unmarked. The temporal region is grayish olive. 

 The oculars, loreal, nasals, labials, and lower half of the 

 rostral are yellow. A black line runs along the upper border 

 of the supralabials and across the middle of the rostral. The 

 nasals, loreal and oculars are margined with black. There 

 is no yellow temporal spot. The lower surfaces are light 

 yellow, unmarked. 



A female specimen in life had the upper surface of the 



