582 



REPORT OF NATIONAL MUSEUM, 1898. 



elevated. Brachial scales in five, antebrachials in three rows. Fem- 

 orals in seven, tibials in three rows. Hind leg- extended reaching 

 auditory meatus in front. Femoral pores 20-22. 



Measurements. — Total length, 315 mm.; length to angle of mandible, 

 25 mm.; length to edge of collar, 29 mm.; length to axilla, 35 mm.; 

 length to vent, 8i> mm. ; length of fore limb, 32 mm. ; length of fore foot, 

 14mm.; length of hind leg, 63 mm.; length of hind foot, 34 mm. 



The general appearance of the coloration of this species is that of a 

 multitude of rather small grayish-yellow spots closely ])laced on a 

 ground of grayish olive. These may be counted as forming from four- 

 teen to sixteen rows between the abdominal plates of one side and 

 those of the other along the back. There are several black ci escentic 

 spots from the axilla posteriorly. The hind limbs and the posterior 

 side of the fore limb are spotted like the back. Thorax and collar, and 

 more or less of the gular region, black. Belly scales with black bases. 

 Tail uni color above and below, the distal three-quarters of the inferior 

 surface black. A black spot in front of the meatus auditorius, and 

 another below the posterior border of the orbit. A few shades on side 

 of head; top of head uniform olive. In one of the specimens the spots 

 on the middle dorsal region are obsolete, the result being a grayish 

 olive hue. 



The coloration of this subspecies is something like that of the C. 

 variolosus, but that is another species. The interparietal plate is nar- 

 rower than in the C. t. tessellatus, and the black breast and gular region 

 are not seen in it. 



A number of young specimens accompany the two adults described. 

 They have two narrow stripes on each side of the middle line, and the 

 spaces between them contain each a row of pale spots. The thorax is 

 not black. These resemble the young of C. t. tessellatus {G. gracilis) 

 but the latter has brighter colors, and when the spaces between the 

 stripes contain marks they are delicate longitudinal lines (Cat. No. 3034, 

 type of C. gracilis). 



This form is only known from the Colorado River of Arizona. 



Cnemidophorus tessellatus melanostethus Cope. 



CNEMIDOPHORUS TESSELLATUS i^THIOPS Cope. 



Eows of brachial scales 4-5; of females 6-7; of antebrachials 2, 

 except proximally, where there is an additional narrow median row; 

 of tibials 3, with part of another. Dorsal scales .33 mm. Interparietal 

 plate as wide as parietals, and a little longer, followed by two rows of 



