8. CALLISAURUS 157 



by a narrow dark line formed by the confluence of the dusky 

 markings on the dorsal aspect of the limb. 



"In the lighter colored specimens the pattern on the 

 tail is the same as in the darker ones. The markings on 

 the dorsal surface of the limbs may also be the same, but 

 are frequently obscure or entirely obsolete. The ground 

 color of the back is gray relieved by numerous minute spots 

 of white. The head is dark yellow or light brown. In 

 the most pallid individuals there are no dark markings 

 above, except the usual ones on the tail, and very faint indi- 

 cations of dark mottlings on the limbs. The head is cream 

 colored, the limbs white faintly tinged with yellow. The 

 ground color of the neck is light brownish ash in the form 

 of reticulations enclosing areas of pure white. The ground 

 color of the body is the same, but increased in amount, so 

 as to constrict the lighter markings to rounded areas which 

 are lemon yellow on the back, changing to orange yellow 

 on the sides. On the base of the tail the cross bars are 

 rather obscure, and separated by lemon yellow areas; dis- 

 tally the bars are black separated by reddish brown inter- 

 spaces. 



"The coloration of the ventral surfaces is the same in 

 both light and dark specimens. The inferior surface of 

 the tail and limbs is pure white. Throat white or whitish 

 :n the females, but in males often suflFused with light bluish 

 or reddish purple, although occasionally but faintly. It is 

 also usually crossed by several oblique, more or less dis- 

 tinct, lines of dusky. In nearly all females and in some 

 males there is a gular patch of brilliant pink, and another 

 on the lateral region of the breast. On the sides of the 

 belly in all of the males there are two extensive patches of 

 bright blue, broadly separated mesially by white, and con- 

 taining two long triangular spots of jet black. The broad- 

 est side of these black spots lies close to the inner margin 



