126 3. IGUANID& 



afterward in Pahranagat Valley, Indian Spring Valley, the 

 Amargosa Desert, Tule Canyon, and numerous other lo- 

 calities. The change does not take place till late in the 

 development of the egg. Many pairs were observed in 

 copulation in Diamond and the Upper Santa Clara Valleys, 

 Utah, and thence northward to Mountain Meadows and 

 the Escalante Desert, and westerly across the Juniper 

 Mountains to Meadow Creek Valley from May 17 to 19, 

 but no trace of the red coloration had appeared. The red 

 individuals were always found to contain large eggs, gen- 

 erally measuring from 12 to 15 mm. in length, with the 

 coriaceous shell already formed." 



Mr. Camp observed: "One of the females taken in 

 July still displays the red nuptial coloration: the bars on 

 sides of neck, back and hind legs (in ordinary coloration 

 white or yellow) are peach red to scarlet ; base and tip of 

 tail beneath are shrimp pink. The ground color of this 

 individual is light neutral gray on the lighter parts of the 

 back j fuscous spots occur on the back and sides, with bands 

 of the same color on the tail. A female not exhibiting red 

 coloration contained one large egg. A large male has 

 scarcely a trace of the ordinary reticulation on the back, and 

 the brown dorsal spots are reduced to small dots on the 

 body and tail. The longest specimen, a male, has the fol- 

 lowing measurements: total length 364 millimeters, tail 

 length 260 millimeters. 



"The leopard lizard, probably the swiftest of North 

 American desert reptiles, was fairly common in the Turtle 

 Mountain district at the time I was there. This species does 

 not inhabit the rocky hillsides in that vicinity ; unlike the 

 Bailey collared lizard, it appears to haunt the more level 

 plains and sandy places. Individuals are wary and take to 

 retreats, often before it is possible to get a shot at them. 



