33. PITUOPHIS 731 



ning back and down from the upper postocular plate. The 

 top of the head posteriorly has a few small, scattered, dark 

 spots. The spaces between the dark dorsal blotches on the 

 posterior portion of the body are yellow or orange yellow, 

 usually somewhat obscured by dark brown streaks along the 

 keels of the scales. The lower surfaces are yellow or yellow- 

 ish white with irregular spots or blotches of dark brown or 

 black on the gastrosteges and urosteges. There is no definite 

 median subcaudal black band. 



Length to anus 758 800 863 1028 1125 1125 



Length of tail 126 148 168 179 190 207 



Variations. Twenty-nine specimens from Utah show the 

 following variations. The loreals are 1 1 in all. The pre- 

 oculars are 1 1 in twenty-one, or 87%} and 2 2 in three, 

 or 13 % of those undamaged. The postoculars are 3 3 

 in twelve, or 52%; ; 2 2 in ten or 43%; and 2 3 in one, 

 or 4%. The temporals are 3 4 in ten, or 43%; A 4 in 

 seven, or 31%; 4 5 in three, or 13%; 3 3 in one, or 

 4%; 2 3 in one, or 4%; and 3 5 in one, or 4%. The 

 supralabials are 8 8 in thirteen, or 56%; 8 9 in five, or 

 22%; and 99 in five, or 22%. The infralabials are 

 1 31 3 in eight, or 38 % ; 1 21 3 in five, or 24 % ; 1 21 2 

 in four, or 1 8 %; 11 1 1 in two, or 9%; 11 12 in one, or 

 5%; and 13 14 in one, or 5%. The scale-rows are 29 in 

 fifteen, or 56%; 31 in seven, or 26%; and 27 in five, or 

 18%; the average is 29 rows. The gastrosteges vary in 

 number from 223 to 241, males having from 227 to 241, 

 females from 223 to 240; the average in twenty-two males 

 is 233, in five females, 235. The urosteges vary from 55 

 to 71, males having from 58 to 71, females from 55 to 62; 

 the average in twenty-three males is 66, in five females, 60. 



The dark blotches between head and anus in 29 speci- 



