130 REPTILES AND BATRACIIIANS 



the back; the sides of face and neck are sprinkled with 

 white. 



San Luis Potosi, Mexico. 



On these the back is sprinkled with spots of white, less 

 than a scale in size. 



Gerriionotus cceruleus Wiegm.y 1828. 

 San Luis Potosi, Mex. 



Phrynosoma cornutum TIarl. ; Gray. 



Monclova, Mex. ; San Pedro, Mex. ; San Antonio, Tex. 



The largest specimen has a length of six inches, body 

 four and an eighth ; greatest width two and three-fourths 

 inches. 



Phrynosoma orbiculare Wiegm, 1828. 



City of Mexico ; San Luis Potosi, Mex. ; Sutherland 

 Springs, Tex. 



The femoral pores on a dozen specimens range in num- 

 ber from eleven to eighteen on a side. 



Phrynosoma modestum Girard, 1852. 



San Pedro, Parras, Saltillo and Monclova, Mex. 



On nine specimens the number of femoral pores ranges 

 from nine to seventeen on a side. The series make a turn 

 backward as they meet in the middle, instead of an angle 

 directed forward as in the preceding. 



Holbrookia maculata Girard, 1851. 



From San Luis Potosi and Concordia, Mex. 



Compared with others from Dakota these specimens are 

 less uniform in color. The black spots on the back are 

 more distinct as also the while at their hinder borders. The 

 black marks at the side of the abdomen are more intense 

 and extend farther under the belly. The northern spec- 



