CKOCODILIANy, LIZARDS, AND SNAKES, 



397 



ami is very ditilicult to describe. It differs in coloration from its nearest 

 ally, S. marmoratus, by the absence of serial arrangem<!nt of dorsal 

 blotches; by the decided -shaped arrangement of the blue on the 

 chin and the lines on the Jaws; the white line on the Hanks; the greater 

 separation of the ])atches on the belly, and the absence of a dark 

 inner border to them. The form differs very materially. 



A young specimen (Cat. No. 2731a) has a more decided serial arrange 

 ment of larger and more quadrate dorsal blotches, and there is an 

 indication of a dark blue patch on the throat, with a transverse whitish 

 band connecting tiie yellowish i)atch on the shoulder. 



In the four female specimens before me (Cat. No. 2743) the general 

 color is of a light bluish; greenish olive above, and whitish beneath. 

 There is a faint trace of ten dorsal rows of small cresceutic blotches, 

 and of a lateral light line, with a dusky stripe along the sides, but this 

 is very indefinite. There is no decided indication of the usual blotches 

 or lines about the shoulder. 



This species is readily distinguished from most of its allies with 

 small scales by the smoothness of the cephalic x)lates and the marked 

 inferiority in size of the lateral to the dorsal plates. Those on the side 

 of the neck and body for some distance behind the slioulders are almost 

 like fine tubercles, not imbricated nor carinated. 



I have referred Cat. No, 2739, males and females, to this species, 

 although there is an unusual difference in color for the sexes of the same 

 species and the hind toes are shorter. In coloration this is one of the 

 handsomest of the genus. 



Sceloporus couchii Jiaird. 



SCELOPORUS CHRYSOSTICTUS Cope. 



Seel ojior Its (■hrijso.stirliis C'Oi'F,, I'roc. Acad. N;it. Sci. I'hila., ISlitJ, p. 12.~>; I'roc. 

 AiiKT. Phil. Soc, XXII, 1885, p. 391.— Bout.kngkk, Cat. Li/. IJrit. Miis., 2d 

 e«l.,II, 1885, p. 235. 

 Sceloporus cuprcns BocouKT, Mis.s. Sci. Mex., K'cpt., ]>. 210, pi. .win l>is. 

 Near the <S'. scaJaris^ but without auricular marginal scales larger 

 than the temporal, with smaller dorsal scales and dlll'erent coloration. 

 Lateral and ventral scales nearly equal; dorsals in forty-five rows from 

 occiput to rump, obtusely mucronate, not notched. No larger plates 

 behind i)arietals. Cephalic plates rugose; three pair su[)ranasals; inter- 

 nasal small, Hat; frontal nearly equally transversely divided, anterior 

 half longitudinally divided. Interparietal narrowed anteriorly, long as 

 broad ; parietals obli(iue, longer than broad. Supraorbitals surrounded 

 by marginals, the external separated from them by a row of rhombic 



