28. COLUBER 677 
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. 
Bengthi to; anuee 780 806 820 835 886 
Wenpthvof stale 342+ 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. 
