28. COLUBER 



head and neck a bright blue-gray, tinged with pinkish gray 

 on the snout and supraoculars and changing gradually to 

 olive and then to brown on the body and tail. The lateral 

 dark markings were black anteriorly, becoming olive and 

 then yellowish brown posteriorly. The light lateral stripes 

 are white anteriorly but soon change to a bright straw-yellow 

 behind the neck. The markings on the side of the head are 

 white and black. The lower surfaces of the head and neck 

 are white, but, from the fifteenth gastrostege to the tip of 

 the tail, the color below is bright lemon yellow. There is 

 a small orange spot near the middle of each gastrostege, 

 from the 10th to the 22nd. The iris is brown with golden 

 dots, and a narrow yellow line around the pupil. The 

 tongue is black. 



Length to anus_ 780 806 820 83 5 886 



Length of tail _ ...34-2-t- 375+ 358 396+ 



Distribution. — This racer is common in parts of south- 

 eastern Arizona, and ranges thence south into Mexico. 



In Arizona, it has been collected in the San Luis Moun- 

 tains on the Mexican boundary line, and probably at Cave 

 Spring. It has been recorded from Camp Grant, Graham 

 County, and Fort Bowie, Cochise County. I have seen speci- 

 mens from Pima County, taken at the Steam Pump in the 

 foothills of the Catalina Mountains about 18 miles north 

 from Tucson, on the grounds of the Carnegie Desert Lab- 

 oratory at Tucson, and in Sawmill, Stone Cabin and Ma- 

 dera canyons in the Santa Rita Mountains; from Santa Cruz 

 County, collected in Agua Caliente Canyon and in the vi- 

 cinity of Pete Mountain in the Santa Rita range, and at 

 Harshaw in the Patagonia Mountains; and from Cochise 

 County, secured in Miller, Ramsey, Carr, Brown, and Gard- 

 ner canyons in the Huachuca Mountains. One was secured 

 at San Pedro Bay, Sonora, Mexico. 



