CROCODILIANS, LIZARDS, AND SNAKES. 605 



referred to, the C. s. sexlineatus, difler from that subspecies in baviug 

 well -developed postantebrachial scales. 



Tlie gradation in the color characters given is complete, so that no 

 subdivision into subspecies can be made. The case is exactly i)arallel 

 with that of C. tessellatus tessellatus, except that there are here no indi- 

 viduals with the stripes entirely obliterated and complete transverse 

 stripes posteriorly. (Such specimens are the C. (j. scalaru ; see below.) 

 The femoral pores are generally eighteen, but some have sixteen, sev- 

 enteen, and twenty. In eleven of the specimens now before me seven 

 have five infralabials and four have six. These numbers do not coin- 

 cide with the color types. 



Like other members of this genus this subspecies is extremely active 

 in life. They are not easily caught by a single person, and I have spent 

 considerable time in endeavoring to get near them on tlie staked i^lains 

 of Texas, They play hide and seek for a time, and then take refuge in 

 the hole of some fossorial mammal. 



CNEMIDOPHORUS GULARIS SCALARIS Cope. 



Cnemidophorus gularis scalaris Cope, American Naturalist, 1891, p. 1135; Trans. 



Amer. Phil. Soc, 1892, p. 47, pis. x, fig. 10; xii, figs. I, K. 

 Cnemidophorus sexlineatua tigris Cope, Proc. Amer, Phil, Soc, 1886, p. 283; not 



C. tigris Baird and Girard, 



Muzzle moderately acuminate in adults; frenal plate about as high as 

 long; frenoocular 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. Femoral pores nineteen ; 

 in one eighteen, and in one seventeen. Longest toe of extended pos- 

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

 measuring opposite to each other. 



Ground color pale, on the sides jiosteriorly light rosy orange. 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 (Cat, No. 14302). 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 lat- 

 eral ventral plates and all tliose of the thorax with the posterior or 

 concealed face of the anterior leg, are black or blackish in the adult. 



Measurementfi (adult; tail injured). — Length to vent, 93 mm,; length 

 to angle of mandible, 25 mm, ; length to collar, 20 mm. ; length to axilla, 

 2() mm. Length of anteriin- limb, 30 mm.; length of fore foot, 14 mm. 

 Length of hind limb, (37 mm.; length 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 



