282 PROCEEDINGS OF THE NATIONAL MUSEUM vol. u6 



It is possible that the onset of July rainfall provides these lizards and 

 S. graciosus, Urosaurus ornatus, and Holbrookia maculata with 

 optimum conditions for oviposition. Ten eggs of S. undulatus, 

 averaging 12.5 x 8.5 mm., were recovered from a one-inch depression 

 beneath a small sandstone slab July 23, 1956 at 7300 feet. The 

 substrate was damp, loose sand, and the eggs were not buried. 



Large eggs taken from females often contained embryos with 

 well-developed eyes as did all eggs from the clutch obtained July 23, 

 1956. Similar predepositional embryonic growth was reported for 

 S. undulatus in Arizona and S. orcutti (Stebbins, 1954, pp. 240-244). 

 This might be expected if fertilized eggs are retained for an extended 

 length of time as suggested here. The phenomenon may be adaptive 

 in a semiarid region like the Zunis; i.e., to insure annual repro- 

 duction within the limits of optimum activity temperatures, post- 

 depositional development thus can be completed in a relatively short 

 time when oviposition is keyed to adequate summer moisture con- 

 ditions. Hatchlings, 23-28 mm. snout-vent, have been collected as 

 early as July 26, August 9, and August 12 in different summers. 



Locality records: 



MCKINLEY CO.: 5.5 mi. S. Thoreau (CU 5623); 6 mi. S. Thoreau (CU 5088-9 

 5448, 5622, 5681, 5697; UMMZ 121919, 122885-7); between Thoreau and 

 Continental Divide (UMMZ 120311) ; Gallup (CU 5843) ; 14 mi. N. Gallup (UCM 

 6630-37) ; Ft. Wingate (USNM 14406-7, 8250, 8491, 9548; UCM 6638) ; Manuelito 

 (USNM 87031); 5 mi. SE. Baca (UIMHN 39685-6*); 4 mi. NNE. Prewitt 

 (UMMZ 120284); 11 mi. W. Ramah (UMMZ 122884); Valencia cc: Cubero 

 (USNM 87032-4); El Morro Nat. Mon. (KUMNH 15121-6*; UMMZ 122794); 

 2 mi. W. El Morro Nat. Mon. (CU 5606) ; 2.5 mi. E. Laguna Pueblo (KUMNH 

 28065*); 8 mi. SE. Thoreau (UMMZ 122890); Shuman's Ranch (UMMZ 86608); 

 15 mi. E. Grants (KUMNH 15294-5*); 10.4 mi. S. Grants (CU 5608); 1.5 mi. 

 S. Grants (UMMZ 86609); 4 mi. WSW. Grants (UMMZ 86610); 18 mi. SW. 

 Grants (UMMZ 86611); 17 mi. SW. Grants fUMMZ 86612). 



Comparative material examined: 



S. u. elongatus. — New Mexico: san juan co.: Chaco Canyon Nat. Mon. 

 (CU 5618; UMMZ 122896); 7 mi. E. Blanco (UCM 7337-47); 43 mi. SSE. 

 Bloomfield (UCM 7350-55); 2 mi. S. Colo.-N. M. state line on U.S. Rt. 666 

 (UCM 13294-13301); Arizona: apache co.: 10 mi. W. Window Rock (UMMZ 

 120280, intergrades with S. u. trish'chus) ; Canyon de Chelly Nat. Mon. (.UMMZ 

 120278, 120281). S. u. consobrinus. — New Mexico: eddy co.: 2 mi. NW. 

 Carlsbad Caverns Nat. Park, headquarters area (UMMZ 121745). 



Sceloporus graciosus graciosus Baird and Girard 



Sagebrush lizards, represented by the nominate subspecies, usually 

 are considered to be widespread in northwestern New Mexico (Smith, 

 1946, p. 495; Stebbins, 1954, p. 317). Published records, however, 

 are available only for Rio Arriba (Cope, 1900, p. 389; VanDenburgh, 

 1924, p. 205) and Sandoval (Maslin and others, 1958, p. 335) counties. 



