33. PITUOPHIS 735 
dish brown blotches or cross bands. On the anterior part of 
the body the blotches tend to be more or less rounded, post- 
eriorly they are more quadrate, or are wider with concave 
anterior and posterior borders. There are two or three 
series of alternating, often more or less confluent, dark 
blotches or spots on the sides. Across the top of the head 
between the preocular plates is a narrow brown band, more 
or less obsolete in adults. There are similar bands or spots 
below the center of the eye and running back and down from 
the upper postocular plate. The top of the head is light 
brownish yellow, speckled with black. The spaces between 
the dark dorsal blotches on the posterior part of the body 
are light yellowish or grayish orange, usually without dark 
marks on the keels of the scales. The lower surfaces are 
yellow or yellowish white, with irregular spots or blotches 
of light or dark brown on the gastrosteges and urosteges. 
There is no definite median subcaudal dark band. 
Teneth (tom annus: 222s 456 1050 1115 1130 1140 
Ibength: of tale 68 154 153 183 165 
V ariation.—Sixteen specimens from Arizona show the 
following variations. The loreals are 1—1 in all. The 
preoculars are 1—1 in ten or 62%; 2—2 in five, or 31%; 
and 1—2 in one, or 6%. The postoculars are 3—3 in six, 
or 37%; 3—4 in five, or 31%; 4—4 in four, or 25%; 
and 4—5 in one, or 6%. The temporals are 4—4 in seven, 
or 47%; 3—3 in three, or 20%; 3—4 in two, or 13%; 
4—5 in two, or 13%; and 2—3 in one or 7%. The supra- 
labials are 8—8 in eight or 50%; 8—9 in three, or 19%; 
9—9 in three or 19%; 9-10 in one, or 6%; and 8-10 in one, 
or 6%. The infralabials are 12—12 in nine, or 60%; 
13—13 in three, or 20% 3 13—14 in one, or 6%; 14—14 
in one, or 6%; and 11—11 in one, or 6%. The scale-rows 
are 33 in eight, or 50%; 31 in six, or 37%}; 29 in one, or 
