6. CROTAPHYTUS 127 



The tracks of the hind feet of leopard lizards running 

 swiftly in sand were found to be ten inches apart. 



"A grown gridiron-tailed lizard swallowed whole and 

 head first was found in one stomach. The flabby sides of 

 the leopard lizard are often distended with the remains of 

 smaller lizards which they have run down and swallowed." 



Mr. Franklin writes: "There seems to be considerable 

 variation in the color and pattern, depending on the sort 

 of country in which they are found. Those living in a 

 region of dark volcanic rocks have a darker pattern than 

 those found in the red sandy desert. The Leopard Lizards 

 which I observed last summer were of the latter type, and 

 were chiefly seen at Tuba, in the Painted Desert, Arizona. 

 The general color of these lizards was light in tone, the 

 ground color was pale buff and the spots of a soft rich 

 brown which blended at the edges. The females were 

 slightly larger than the males and invariably had a series 

 of brilliant orange-red bars along the sides of the body and 

 tail and along the under side of the tail. None of the 

 males which I examined had any red color. The under 

 sides of both sexes are pure white. 



"These lizards were feeding largely upon cicadas dur- 

 ing the month of June. An examination of their stomachs 

 showed this. On one occasion I saw a Leopard Lizard leap 

 over two feet up and catch a cicada which was singing in a 

 low greasewood bush. 



"Leopard Lizards probably lay their eggs during July, 

 although I was unable to make any observations on their 

 breeding habits. During the month of June I saw many 

 adults but no young, while in August and September I saw 

 no adults but quite a few young lizards, evidently of that 

 year's brood. The young were about five inches in length 

 and were slightly darker than the adults." 



Mr. Cowles notes: "These specimens were found skulk- 



