276 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iie 



of speciiiieiis examined (cf. Fitch and Tanner, 1951, p. 556); thus, 

 the relatively small difference in labial number appears twice as 

 strongly emphasized. Actually, such a distinguishing feature easily 

 could be missed in possible intergrades. 



Neither sexual dimorphism nor bilateral imbalance of labial scales 

 was alluded to by the authors of G. c. auriceps. Etheridge (1960, 

 p. 114) noted that males of C. c. collaris have larger heads and more 

 robust lower jaws than females. In the Zunis, adult females are 

 proportionately smaller than males (table 5) and possess fewer 

 infralabials; seven have 11-14 (x 12.6), 12-16 (13.6) left and right 

 infralabials respectively, and have 13-15 (14.0), 12-16 (14.3) left and 

 right supralabials respectively. Eight males have 12-14 (13.1), 13-15 

 (13.8), 14-16 (14.5), and 13-16 (15.0) left and right infra- and supra- 

 labials. The bilateral imbalance is interesting in that the right side 

 of the head seems to be favored, although this may not be meaningful 

 in light of the sample size. 



Collared lizards are a typical reptile of boulder-strewn hillsides 

 where vegetation is sparse. Such situations usually are found on the 

 lower slopes of mesas and canyons and at the malpais edge in the 

 Zuais. On several occasions, foraging individuals encountered on the 

 tops of mesas seemed to be attracted by large numbers of grasshoppers 

 feeding on the thicker vegetation. These lizards are not restricted to 

 the Roughlands Life Belt, but on the plains they are confined to the 

 vicinity of rocky arroyos. Sceloporus undulatus, Eumeces obsoletus, 

 Masticophis taeniatus, Salvador a grahamiae, and C. collaris were 

 collected in and around an arroyo at 6400 feet in a cholla-juniper 

 dominated section of the Plains-Roughlands continuum. 



Females of C. collaris with the typical red breeding coloration 

 were observed as late as August 11, 1959, but none collected in July or 

 August held large eggs. Specimens taken by Emmet T. Hooper, 

 May 7-9, 22, 1939, have only small ova. Two cross-banded hatchlings, 

 40 and 41 mm. snout- vent, with evident yolk-sac scai's, were found 

 August 25, 1951, at 6500 feet; thus, if about 51-74 days of mcubation 

 are needed (Fitch, 1956a, p. 234), egg-laying may occm- in June or early 

 July, ahead of the summer rains. 



Locality records: 



MCKINLEY CO.: Thoreau (MCZ 62420*); 5.5 mi. SE. Thoreau (CU 5748); 6 mi. 

 S. Thoreau (CWGF); Ft. Wingate (USNM 16761); Gallup (USNM 27738); 14 mi. 

 N. Gallup (UCM 6583-84); Valencia co.: 1.5 mi. S. Grants (UMMZ 86616); 8 

 mi. SE. Grants (UMMZ 86615); 5 mi. E. Grants (CU 3051, 3376); 10.4 mi. S. 

 Grants (CU 5747); 11.5 mi. SSE. Grants (UMMZ 122621-22); 7 mi. SE. Laguna 

 (UMMZ 72649); 5 mi. NW. Rio Puerco (USNM 86937). 



