288 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lie 



CRUZ CO.: 3.5 mi. E. Patagonia (CU 5504); 9 mi. E. Sonoita (CU 877-8); Trench 

 Mine Station (CU 5514). U. o. wrighli. — Utah: kane co.: near Kanab (UMMZ 

 73380-84); san juan co.: near Moab (UMMZ 68573-78). 



Phrynosoma douglassi hernantlesi Girard 



The Zuni Mountains are the type locahty of Tapaya ornatissima 

 Gu-ard (1858) by restriction (Reeve, 1952, p. 928). Presently known 

 as Phrynosoma douglassi ornatissimum, this lizard and the closely 

 related P. d. hernandesi have been reviewed most recently by Reeve 

 (1952), who based the above locality restriction on Stejneger's desig- 

 nation (1890, p. 113) of neotypes of P. d. ornatissimum. Critical 

 examination of 29 adidt (table 5) and 17 subadult topotypes and the 

 neotypes reveals that the Zuni population is composed actually of 

 individuals with the characters of both P. d. ornatissimum and P. d. 

 hernandesi (as defined by Girard, 1858, pp. 395-396; Reeve, 1952, 

 pp. 924-928). 



With regard for diagnostic features, the adult specunens have: (1) 

 temporal spines shorter than their basal diameter in 65 percent and 

 about equal to basal diameter in 35 percent; (2) head width at jaw 

 angle exceeding temporal width in 6 percent, about equal to temporal 

 width in 44 percent, and less than equal in 50 percent; (3) dorsal 

 dark spots light bordered mesially in 45 percent; and not light bor- 

 dered in 55 percent. Only the first character favors allocation with 

 P. d. ornatissimum; numbers two and three are more typical of P. d. 

 hernandesi. These adults might be considered intergrades, but the 

 added characterization of subadults and all specimens with special 

 regard for locality data demonstrates that the above features vary 

 ontogenetically as well as environmentally. 



Seventeen subadults, 24-45 mm. snout-vent, resemble P. d. 

 hernandesi in color pattern as do five larger adults from the Montane 

 Life Belt. Vivid dorsal coloration is virtually absent in these speci- 

 mens; their dorsal blotches lack light mesial borders. In contrast, 

 adults from Roughlands and Plains localities are bright orange or 

 reddish brown in general aspect (brighter ventrally) and possess 

 mesially and posteriorly light bordered blotches as in P. d. orna- 

 tissimum. Tail length /snout- vent length is 0.369-0.471 (x 0.429) in 

 subadults, 0.429-0.542 (0.470) in adults; hence, absolute tail length is 

 unacceptable for comparative pm'poses as proposed by Reeve (1952, 

 pp. 924, 928) unless ontogenetic variation is accounted for. Further- 

 more, it appears that adults have relatively broader heads and longer 

 temporal spines than subadults. None of the latter have the jaw 

 angle width greater than the temporal width or have temporal spines 

 equalmg their basal diameter in length. 



The idea that environmental gradients produce both P. d. hernan- 

 desi and P. d. ornatissimum in a single geographic area is not new. 



