33. PITUOPHIS 721 



teriorly, and usually have dark marks on the keels of the 

 scales. The lower surfaces are yellow or yellowish white, 

 more or less spotted or blotched with black or dark brown, 

 especially near the ends of some of the gastrosteges and 

 urosteges. The dark marks on the urosteges may form a 

 pair of dark longitudinal subcaudal streaks. 



Length to anus 305 910 930 1160 1190 1320 



Length of tail 60 195 193 230 218 24-5 



Variation. Sixty-nine specimens all have loreals 11. 

 The preoculars are 2 2 in forty-four, or 64%} 1 1 in 

 twenty, or 29%; and 1 2 in five, or 7%. The postoculars 

 are 3 3 in forty, or 59% ; 4 4 in thirteen, or 1 9% ; 3 4 

 in eleven, or 16%; and 2 3, 2 4, 4 5, and 5 5 each 

 in one. The temporals are 4 4- in twenty-three or 34-%; 

 3 3 in fifteen, or 22%; 3 4 in twelve, or 18%; 4 5 in 

 five, or 7%; 5 5 in five, or 7%; 35 in two, or 3%; 

 and 2 2, 2 3, 2 4, 4 6, and 5 6 each in one. The 

 supralabials are 8 8 in thirty-three, or 48%; 9 9 in 

 nineteen, or 27%; and 8 9 in seventeen or 25%. The 

 infralabials are 13 13 in thirty-four, or 49%; 13 14 

 in ten, or 14%; 12 12 in eight, or 12%; 12 13 in seven, 

 or 10%; 14 14 in three, or 4%; 1113 in two, or 3%; 

 and 1011, 1111, 1112, 12 14, and 14 15 each in 

 one. The scale rows are 33, in thirty-seven, or 54%; 31 in 

 twenty-five, or 36%; 35 in six, or 9%; and 29 in one, or 

 1%; the average is 32.4 rows. The gastrosteges vary in 

 number from 217 to 243, males having from 217 to 243, 

 females from 218 to 240; the average in 43 males is 228, 

 in twenty-five females, 231. The urosteges vary from 62 

 to 85, males having from 62 to 85, females from 62 to 83; 

 the average in thirty-nine males is 76, in twenty-four fe- 

 males, 70. 



The dark blotches between head and anus in 71 sped- 



