326 3. ICUANID.^ 



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. jarrovii 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 Sonera 

 Mexico); Baird, U. S. Mex. Bound Surv., Vol. II, 1859, Rept. 

 p. 5, pi. 29, figs. 1-3; BocouRT, Miss. Sci. Mex., Rept., 1874, p' 

 171, pi. XVII, figs. 9-9c; 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; Cote, 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, 



