132 REPTILES AND BATRACHIANS 



Utaornata^. & G., 1852. 



Guaymas ; San Francisco, Cal. 



Pores varying in number from ten to thirteen on each 

 side. 



Crotaphytus collaris Say; Holbr. 



Monclova, Mex. 



The exterior of the two oblique bands on the neck is 

 broken into four or five spots. On the body behind the 

 black collar there are six transverse series of black spots, 

 the median pair of each being larger and more intense in 

 color. Lighter spaces separate the spots and form cross- 

 bands, as in specimens from Arkansas. 



Sceloporus torquattjs Wiegm., 1828. 

 Concordia, near Saltillo, Mexico. 



Sceloporus poinsettii B. <& G., 1852. 

 Monclova and San Luis Potosi, Mexico. 



Sceloporus spinosus Wiegm., 1828. 



San Antonio, Texas; San Pedro, Mexico. 



Dr. Boulenger states, 1885, that this species "appears 

 to be completely linked with S. undulatus" through the 

 variety S. clarkii B. & G. 



Sceloporus scalaris Wiegm., 1828. 



Concordia, thirty miles north of Saltillo, Mexico ; City 

 of Mexico. 



Sceloporus grammicus Wiegm., 1828. 

 San Luis Potosi, Mexico. 



Sceloporus microlepidotus Wiegm., 1834. 

 City of Mexico. 



