326 3. IGUANID& 



the cracks and crevices in the rocks until toward noon, when 

 they could be found sunning themselves on the whitish 

 rocks, against which their dark bodies formed a violent con- 

 trast. As a matter of fact, when alive or recently killed, 

 they were of a uniform "dead" sooty black, without the 

 slightest trace of the white collar stripes. When picking up 

 these black lizards with the exceedingly rough and prickly 

 scale covering I did not doubt that I had before me an un- 

 described species, remembering well that S. jarrovn was 

 originally characterized as having a very smooth pholidosis. 

 Great was my amazement, however, on returning to my 

 quarters and unpacking my booty to find that these dull 

 black animals had changed in the bag to a very gorgeous blue 

 with a broad black collar most distinctly set off by white 

 margins. I suppose the blackness was due to the cool tem- 

 perature and that the brilliant colors are chiefly in evidence 

 during warm weather." 



65. Sceloporus torquatus poinsettii (Baird & Girard) 

 MEXICAN SCALY LIZARD , 



Sceloporus poinsettii BAIRD & GIRARD, Proc. Acad. Nat. Phila., Vol. VI, 

 1852, p. 126 (type locality, Rio San Pedro, Texas, and Sonora 

 Mexico); BAIRD, U. S. Mex. Bound Surv., Vol. II, 1859, Kept, 

 p. 5, pi. 29, figs. 1-3; BOCOURT, Miss. Sci. Mex., Kept., 1874, p* 

 171, pi. XVII, figs. 9-90; COPE, Bull. U. S. Nat. Mus., No. i, 1875, 

 p. 48; YARROW, Surv. W. looth Merid., Vol. V, 1875, p. 595; COUES, 

 Surv. W. looth Merid., Vol. V, 1875, p. 595; YARROW & HENSHAW, 

 Ann. Rep. Chief of Engineers for 1878, Surv. W. looth Merid., 

 Appendix NN, 1878, p. 223; COPE, Bull. U. S. Nat. Mus., No. 17, 

 1880, p. 17; HERRICK, TERRY & HERRICK, Bull. Sci. Labor. Denison 

 University, Vol. XI, 1899, p. 123; HERRICK, TERRY & HERRICK, 

 Bull. Univ. New Mex., Vol. i, 1899, p. 123, pi. XV. 



Sceloporus torquatus var. C. BOCOURT Miss. Sci. Mex., Rept., 1874, p. 



173. 



Sceloporus poinsetti YARROW, Bull. U. S. Nat. Mus., No. 24, 1883, p. 58. 

 Sceloporus torquatus poinsettii COPE, Proc. Amer. Philos. Soc., Vol. XXII, 



1885, p. 402; BOULENGER Cat. Lizards Brit. Mus., Vol. II, 1885, 



