1906.] 



IN MEXICAN LIZARDS. 



331 



The size of these lizards is not mentioned, except that " the 

 size of the adults exceeds a little that of the Eastern form 

 [C. sexliiieafus], a specimen from Arizona measuring 100 mm. 

 This is, however, larger than the average." 



According to Cope, C gularis gularis is found in "Western 

 Texas, New Mexico, and Arizona, and in Mexico as far south as 

 Chihuahua and Monterey. A locality almost at sea-level is Mata- 

 moros, near the mouth of the Rio Grande. Cope mentions it 

 especially as inhabiting the Staked plains of Texas. Tucson and 

 Fort Lowell in Arizona, Chihuahua, Monterey, are all situated in 

 flat, practically treeless plains. 



Only a few specimens examined by myself agree with the 

 typical C. gularis gularis. They are the following : — 



I. British Museum : 6 specimens from Fort Lowell, Arizona, 

 and from Duval County, Texas. 





Length, 

 (mm.) 



Collar. 



Forearm. 



Pores. 





Fort Lowell 



77 



Row of 



Large 





Numerous sharp white 



(2). 





large scales. 



polygones. 





specks in the stripes, 

 indicating change to- 

 wards C. communis. 

 Field-spots. 



Duval Co., 



62 



Edge formed 



Enlarged 



15 



Faintest field-spots. 



Texas. 





by row of 

 ' granules. 



polj'gones. 







" 



67 



Larger scales. 



Large scutes. 



18 



3 pairs of stripes and sub- 

 divided mid-field. Field- 

 spots. 



J) 



65 



" 



" 



17 



4 complete pairs of stripes. 

 Brown spots in fields I. 

 and II. 



» 



Very 

 young 

 form. 



" 



" 





Already with 4 pairs of 

 stripes, 4/4 enclosing an 

 island. 



II. One of four sjyecimens, taken by Dr. Meeh at San Jiian, 

 south of Monterey, agrees with the typical gularis, and contrasts 

 considerably with the three others in size and arm-scaling. It is 

 a female of 72 mm. Without frenoculars. Posterior surface of 

 forearm with a short row of large scutes. Femoral rows 6. 

 Pores 17. Throat and collar pink. Chest and abdomen white, 

 suffused with bluish green. Upper surface with 7-8 pale stripes ; 

 the normal three pairs being white, but the mid-field is sharply 

 marked by a black band against the median side of each third 

 stripe, and the resulting grey central region is imperfectly divided 

 by a row of black dots in the mid-line. A row of rather large, but 

 ill-defined pale spots in the first and second fields. The posterior 

 thigh-stripe is partly broken. 



This specimen indicates, by the pink throat and by the sub- 

 division of the mid-field 3-3 into a 4th pair of stripes, a tendency 

 which becomes preponderant in the lizards which are found to 

 the south of the home of the typical gularis. 



