410 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol. 48. 



Variation in the femoral pores 



of Callisaurus ventralis and C. 



v. myurus. 





Locality. 



12 



13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23 



24 



25 



Average. 



Callisaurus v. myurus, new spe- 

 cies, Pyramid Lake Indian 

 Agency, Washoe County, Ne- 

 vada, 53 specimens 



5 

 2 



21 



5 

 4 

 1 



35 



3 

 3 



4 



34 



10 

 8 

 6 



8 



14 



9 



20 



9 



3 



8 



7 



22 



i 



















14.2 



Callisaurus ventralis (Hallo- 

 well) , vicinity of Fish Springs, 

 San Diego County, California, 

 27 specimens 



7 



5 



30 



7 



3 



1 



11 



2 













16 



Callisaurus _ ventralis (Hallo- 

 well), Yuma, Arizona, 25 

 specimens 













15.8 



Callisaurus ventralis (Hallo- 

 well), Tucson, Arizona, 54 

 specimens ("Ruthven) 





5 

 2 



5 



1 





3 





17.6 



Callisaurus ventralis (Hallo- 

 well), Fairbank, Cochise 

 County, and Fort Lowell, 

 Pima County, Arizona, 14 

 specimens 





17.1 

























The dorsal color is deep blue-gray in contrast to the ashy-gray or 

 even lighter shade of C. ventralis. In large specimens the color 

 approaches that of the darker individuals of C. ventralis. Unfortu- 

 nately the dorsal color was not recorded in fresh specimens, but com- 

 parison of the alcoholic material from Nevada with specimens of a 

 similar nature from San Diego County, California, Yuma, Fairbank, 

 and Fort Lowell, Arizona, shows that it is a darker form. Dr. C. 

 Hart Merriam (Stejneger, 1893, p. 172) mentions a Callisaurus from 

 Death Valley, California, which, he says, is ' 'much shorter and broader 

 (than C. ventralis), with a shorter tail, and is bluish-gray in color. " 

 He thinks this is the same form which inhabits the region about 

 Pyramid Lake, Nevada, and from his description this appears to be 

 true. Three specimens in the Stanford University collection from 

 Owen's Valley, a locality a little to the north of Death Valley, have 

 the characteristic dorsal color of myurus. Unfortunately, they are 

 mutilated beyond hope of obtaining accurate measurements. The 

 femoral pores in two of them are 14-14 and 14-16. 



A study of the ventral color pattern of the males of myurus was 

 undertaken to find, if possible, any variation toward the three bar 

 pattern of Callisaurus draconoides Blainville. In 33 males but one 

 variant was discovered, this individual having two black bars and a 

 small black spot on one side of the belly, while the other side possessed 

 two complete bars, the normal number. 



The adult female of myurus is colored essentially like the male, but 

 the blue patch on the belly is absent, the black bars are faintly out- 

 lined and the gray gular patch is lacking. A salmon-red spot may or 

 may not be present on the throat. 



The color of the young male is as follows: In general like adult 

 female except for heavier markings on the throat and absence of a 



