THE OENUS CNEMIDOPHORUS. 



47 



Gnemido^plioTus gularis scalaris Cope. 



American Naturalist, 1891, p. 1135 ; (published March 1, 1892). 



Cnemidophorus sexlineatus tigris " B. & G." Cope, Proceeds. Amer. Philos. Soc, 1886, p. 283 ; not C. tigris B. & G. 



Muzzle moderately acuminate in adults ; frenal plate about as high as long ; fre- 

 noocular plate generally wanting. Brachial scales small, in eight rows ; antebrachials 

 in three ; postantebrachials in two or three rows. Femorals in eight rows. The 

 three large anal plates are bounded by several small plates laterally and in front. Fe- 

 moral pores nineteen ; in one eighteen, and in one seventeen. Longest toe of 

 extended posterior leg reaching to front of auricular meatus. First and fifth toes 

 measuring opposite to each other. 



Ground color pale, on the sides posteriorly light rosy oi-ange. The dark color 

 only remains as narrow transverse black stripes which do not cross the middle line, 

 which is occupied by a longitudinal series of spots. This is due to the fact that in 

 the adults the black ground is completely broken up by the transverse extensions of 

 the light stripes, which are quite traceable in the young. In some specimens the 

 black spots do not fuse on the sides into transverse stripes (^o. 14,302). All the 

 dark markings fade out on the limbs and sacral region, leaving a gray ground (in 

 alcohol) which is marked with rosy orange spots. The lateral ventral plates and all 

 those of the thorax with the posterior or concealed face of the anterior leg, are black 

 or blackish in the adult. 



Measurements of adult (tail injured) : Length to vent 93 mm. ; do. to angle of 

 mandible 25 mm. ; do. to collar 29 mm. ; do. to axilla 2G mm. Length of anterior 

 limb 30 mm. ; do. of fore foot 14 mm. Length of hind limb 67 mm. ; do. of hind 

 foot 37 mm. 



Several specimens of this form are contained in the collection, and they agree 

 closely in all respects. In coloration it is perhaps the most ornamental of the genus. 

 It is well distinguished from the C. grahamii in color characters, as well as in the 

 presence of the well-developed postantebrachial scales. In the C. gularis it corre- 

 sponds exactly in color characters with the tigris form of the C tessellatus tessellatus, 

 designated in the plate of colors (XII) as D and E. 



Cnemidophorus gularis scalaris Cope. 



Catalogue Number. 



Number of Specimens. 



Locality. 



From whom oltained. 



Nature of Specimen. 



8,319 

 14,302 



5 

 2 



Mexican Plateau S. of 



Chihuahua. 

 City of Chihuahua. 



J. Potts. 



Edw. Wilkinson. 



Alcoholic. 

 Alcoholic. 



