3. JGUANIDM 381 



near Gsnant, Cottonwood Creek), Bingham (Blackfoot), 

 Power (American Falls), and Bannock (Pocatello) counties. 

 In Nevada, it has been secured near Mountain City, 

 Carlin and near Deeth, Elko County. The recorded local- 

 ity "St. Thomas, Arizona" (Yarrow), may perhaps be an 

 error for St. Thomas, Clark County, Nevada. 



Habits. — Professor H. J. Pack has published notes on 

 some of these lizards "obtained from the western part of 

 Salt Lake City, on low, alkaline land. The predominating 

 plant life here is species of A triplex and Sarcobatus. In 

 this locality horned lizards are not uncommon, and in some 

 places are abundant. I collected 20 specimens from an 

 area of about 1 acres, one day in three hours. 



"During captivity the Phrynosoma were fed upon 

 insects collected with a net from a nearby alfalfa field. 

 The principal insects thus secured werej alfalfa weevil 

 larvae, Phytonamus posticus; larva and adult Pieridcp; 

 ants J bees; and locusts. All of these, especially the pierid 

 larvffi, were eaten with avidity. 



"One habit of special interest was the production of 

 young. Three female lizards were, early in the summer, 

 placed in separate compartments, so that they might be indi- 

 vidually observed. On the morning of August the four- 

 teenth, two of the lizards were found surrounded by young, 

 one by eleven and the other by fourteen. On the morning 

 of the sixteenth, the other female was found with ten young. 

 In each case birth occurred during the night, at least some- 

 time between the hours of 6 P. M. and 7:30 A. M. I do 

 not know whether this is constant in the species." 



