814 13. COW BRIDGE 



blackish streak usually runs back from the eye in specimens 

 light enough to show it. The labials are bluish gray or 

 yellowish. The pineal spot is often present on the suture 

 between the parietal plates. The belly may be yellowish, 

 olive, plumbeous, or slate; the throat is yellowish white; 

 the lower surface of the tail is sometimes brick red. 



Length to anus 372 395 420 518 560 585 



Length of tail 105 112 115 133 164 138 



Variation. Three specimens have no loreal plates; one 

 has a loreal on one side only; the others have the normal 

 loreal 1 1. The preoculars are 1 1 in two hundred and 

 seventy-nine, or 86%; 1 2 in twenty-six, or 8%; and 

 2 2 in twenty, or 6%. The postoculars are 3 3 in two 

 hundred and eighty-four, or 87%; 2 3 in twenty-four, or 

 7%; 2 2 in sixteen, or 5%?; and 1 2 in one. The tem- 

 porals are 1+2 1+2 in two hundred and eighty-nine, 

 or 89%;l+2 1 + 1 in eighteen, or 6%; 1+2 1+3 in 

 eight, or 2%; 1 + 11 + 1 in four, or 1 %; and 3+33+3 

 in three, or 1 %. The supralabials are 7 7 in two hundred 

 and eighty-three, or 85%; 7 8 in twenty, or 6%; 7 6 

 in nine, or 3%; 8 8 in five, or 2%; 6 6 in four, or 1 %; 

 5 5 in one, and 8 6 in one. The infralabials are 8 8 

 in one hundred and seventy-nine, or 55%; 9 9 in fifty- 

 eight, or 18%; 8 9 in fifty-four, or 17%; 7 8 in six- 

 teen, or 5%; 7 7 in nine, or 3%; 9 10 in six, or 2%; 

 and 6 7 in two. The scale rows are 17 17 15 or 

 17 15 15 in two hundred and thirty-six, or 72%; the 

 other 28% all have 19 rows, but the formula may be 

 17191715, 171917, 191917, 191915, 

 162, females from 135 to 154; the average in 118 males 

 in number from 135 to 162, males having from 138 to 

 17 19 17, or 17 18 19 17. The gastrosteges vary 

 is 149.2, in 158 females it is 144.8. The urosteges vary 



