HERPETOLOGY OF ZUNI MOUNTAINS — GEHLBACH 279 



Malpais (UMMZ 8GG13); Acoma Pueblo (USNM 44696); Lava Beds (USNM 

 44697); 8 mi. SE. Thoreau (UMMZ 122889). 



Comparative material examined: 



H. rn. carnpi. — New Mexico: san juan co.: 1 mi. N. Chaco Canyon Nat. 

 Mon. (UMMZ 120277); Arizona: apache co.: 7 mi. N. Springerville (UMMZ 

 121722). H. m. approximans. — New Mexico: otero co.: 3 mi. S. Alamagordo 

 (UMMZ 64690, paratype of H. m. ruthveni); quay co.: 3 mi. S. Montoya (UMMZ 

 69068-69); torrance co.: Pedernal (UMMZ 67850); Lincoln co.: Carrizozo 

 (UMMZ 70080). 



Sceloporus undulatus tristichus Cope x S. u. elongatus Stejneger 



Some attention has been given to the occurrence of S. undulatus 

 in northwestern New Mexico. The possibility that the widespread 

 form S. u. tristichus might intergrade with the northern subspecies, 

 S. u. elongatus, was suggested by Bm't (1933, p. 242). He considered 

 S. u. consobrinus as the plateau lizard occurring in western McKinley 

 County rather than S. u. tristichus, a name which he ascribed to 

 intermediates between S. u. elongatus and S. u. consobrinus. Smith 

 (1938, p. 16) defined S. u. tristichus in the sense employed here and 

 outlined some intergrade populations in southern Utah and Colorado. 

 He mapped S. u. elongatus as being present north of the Zunis but did 

 not indicate specimens examined or published records from this part 

 of the state. S. u. elongatus has been collected since at several locali- 

 ties in San Juan County, New Mexico, and Apache County, Arizona, 

 the closest to the study area being Chaco Canyon National Monument 

 (CU 5618) and Canyon de Chelly National Monument (UMMZ 

 120278). 



The Zuni sample is clearly intermediate between S. u. tristichus 

 and S. u. elongatus (table 6) . An arithmetical measure of subspecific 

 difference proposed by Ginsburg (1938) was revived to clarify this 

 situation. With data drawn from Smith's study (1938, table 2), 

 the foUowmg may be noted. For the best diagnostic character, 

 i.e., nmnber of dorsal scales from occiput to rmnp, the smallest 

 overlap between S. u. elongatus and S. u. tristichus is 10.6 percent. 

 This value is 18.1 percent when S. u. elongatus and the Zuni series 

 are compared and 51.6 percent when S. u. tristichus and the Zuni 

 material are compared. As regards the next best character, number 

 of scales around midbody, overlap (intergradation) values are 23.0, 

 30.4, and 33.4 percent respectively. In both features Zuni specimens 

 are nearer S. u. tristichus. 



Plateau lizards from the vicinities of San Rafael, Paxton Sprmgs, 

 and El Morro National Monument, Valencia County, are most 

 representative of S. u. tristichus, whUe those taken near Crownpoint, 

 Prewitt, and Gallup, McKinley County, are closer to S. u. elongatus. 

 Series collected around Thoreau, McKinley Comity, are intermediate 



