142 PROCEEDINGS OF THE ACADEMY OF [1885. 



next to the inframaxillary plates, as given by Girard as a mark 

 of distinction, is also found in Douglassi. The abdominal scales 

 are spoken of as being acuminate, and such is the case with 

 those of the upper portion of the belly in Douglassi, although 

 lower down they are somewhat obtuse. 



Bel ween Douglassi and the subspecies ornatissima and pygmeea, 

 of some authors, I can perceive no differences. Examina- 

 tions of numerous specimens in the collection of the Academy 

 of Natural Sciences of Philadelphia, from all parts of its 

 extended habitat, convince me that there are no fixed discrimi- 

 nating characters, not even of size, as the smaller northern forms 

 are found to grade imperceptibly into their larger southern 

 neighbors. And, as pygmsea was described from the region of 

 the Columbia River, and ornatissima from New Mexico, the 

 former as small and the latter as large, and corresponding 

 otherwise as they do with Douglassi, there is good reason for con- 

 sidering them onby as extreme forms of this species. 



2. Phrynosoma Boucardi 



I'upaya Boucardi Dumeril & Bocourt, Miss. Sci. au Mex. et Am. Cent. 

 Kept., 18T0, p. 225, pi. xi, fig. 4. 



Head broader than long ; cephalic spines of medium length ; 

 occipital spines directed nearly vertically upwards, not pro- 

 longed as far posteriorly as the longest temporal; sublabials 

 small, increasing in size posteriorly ; inframaxillary plates some- 

 what smaller than the posterior sublabials ; no enlarged pointed 

 gular scales ; one row of pyramidal scales at the periphery of the 

 abdomen; abdominal scales smooth; back with numerous spinous 

 scales ; tail of ordinary length, similar to the body, with but few 

 spines along the margin. 



Habitat. — Plateau of Mexico. 



This species is very easily separated from its nearest allies, 

 Douglassi and orbicularis, by the character of the occipital 

 spines. In the two latter these spines are directed nearly hori- 

 zontally backward, while in the present species the}' project 

 nearly vertically upward. 



:;. Phrynosoma orbicularis. 



Lacertus orbicularis Hernandez, Nov. Plant. Anim. Min. Mex., \\i, 1651, 

 p. 327, fig; Linnaeus, Syst. Nat.. 1789, p. L061 ; Cuvier, Regn. 

 Anim., ii, 1817, ].. 35; Id., Sded., ii, L819, i». 37, 



