130 REPTILES AND BATRACHIANS 



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 



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than a scale in size. 



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GERRHONOTUS COERULEUS Wiegm., 1828. 

 San Luis Potosi, Mex. 



PHRYNOSOMA CORNUTUM ZTarlf. ; 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 ORBICTJLARE Wiegm, 1828. 



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



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 The femoral pores on a dozen specimens range in num- 



ber from eleven to eighteen on a side. 

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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. 



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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 white 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- 



