Stejneger — A New Lizard from Texas. 229 



different in size from the dorsals; ventral scales smooth rounded behind, 

 entire; scales on throat distinctly smaller than ventrals; adpressed hind 

 limb reaches the anterior border of the ear; tibia slightly shorter than 

 the shielded part of the head ; the distance between the base of the fifth 

 toe and extremity of the fourth exceeds by a half millimeter the distance 

 between the end of the snout and the ear; 16-17 femoral pores; caudal 

 scales much larger than dorsals, the keels ending in a point beyond the 

 posterior border of the scales; two enlarged postanal scales. 



Color (in alcohol) above olive gray with faint indications of two narrow 

 disconnected longitudinal black lines on the back and a few similar zig- 

 zaggy cross lines, the anterior of which extends downwards in front of 

 the insertion of the forelegs so as to form a narrow interrupted black 

 collar; on the side of the neck from the ear to the shoulder joint a rather 

 broad blackish spot crossing this line; underside whitish, the throat with 

 a number of longitudinal narrow dusky lines; sides of belly blue with a 

 well-defined inner edge of bluish-black leaving only a narrow space of 

 white in the middle. 



Dimensions. — Total length 103 mm. ; tip of snout to vent 45 mm. ; tip 

 of snout to ear 10.5 mm. 



Variation. — The greatest variation in the series before me is in the 

 parietal shields. In the type and in specimen No. 33,042 there are no 

 parietals or fronto-parietals as distinct from the interparietal, while in 

 the other three specimens these shields are all separate. The parietals 

 and fronto-parietals in these are smaller than the frontals and pre- 

 frontals ; in all the posterior frontal and the interparietal are broadly in 

 contact. The variation of proportion and size of scales, femoral pores, 

 etc., will be seen from the subjoined table. The variation in color is, in 

 the males, chiefly confined to the arrangement of the dusky lines on the 

 throat which in the other specimens assumes the aspect of an irregular 

 marbling rather than longitudinal lines. The two females are distin- 

 guished, besides the absence of postanal shields, by a much more distinct 

 color pattern on the upper parts of the body and by the absence of the 

 blue black-edged patches on the side of the belly ; the black lines ori the 

 back in these appear more like narrow transverse zigzaggy lines, one 

 between the shoulders, one between the hind legs and two in the space 

 between ; head and limbs with similar narrow blackish cross lines. 



Remarks. — There can be but little doubt that the form here described 

 is closely related to Sceloporus microlepidotus , but there is as yet no indi- 

 cation of any intergradation with the latter species. A number of speci- 

 mens in the National Museum from Colonia Garcia, Chihuahua, No. 

 26,598 and Nos. 26,910-11, as well as a specimen from Buena Vista, 

 Coahuila, records which materially extend northwards the known range 

 of S. microlepidotus, show indications of slightly larger scales than speci- 

 mens from southern Mexico, but the difference is plainly within the 

 individual variation exhibited by the series recorded by Boulenger 

 (Proc. Zool. Soc. London, 1897, p. 510). The Chihuahua specimens, 

 moreover, examined by me having only 12-14 femoral pores against 

 14-18 in the southern series, but inasmuch as the number of femoral 



