48. CROTALUS 921 
labial portions do not meet on median line in front of the 
single pair of genials. About four rows of scales between 
supralabials and eye. Scales in 27 to 29 rows, of which one 
or two on each side are smooth. Gastrosteges varying from 
185 to 201. Urosteges 16 to 26. 
The general color is light red, reddish cinnamon, or 
brownish yellow, with a series of large darker blotches along 
the back. These blotches are sometimes very indefinite, 
especially toward the sides. On the middle of the back they 
are separated by light yellow or white. This light edging 
may or may not be continued onto the sides, where smaller 
indefinite dark blotches may often be seen. The head is 
unicolor above. A faint light stripe crosses the side of the 
face from the preocular plates to the mouth. The scales 
behind and above this light stripe are a little darker than 
the ground color, and sometimes are set off posteriorly by 
a light line running down and back from the posterior corner 
of the eye and striking the supralabials in front of the corner 
of the mouth. The tail is ash-color with from three to five 
black rings or cross-bars. The lower surfaces are yellowish, 
often faintly clouded with light brown. 
Length to anus______-___. 379 881 935 960 1080 1160 
Length of tail to rattle _ 49 53 55 60 75 96 
Distribution.—This rattlesnake was first described from 
a specimen of unknown origin. It has since been found in 
the western parts of San Diego and Riverside counties, Cali- 
fornia, and in the northern portion of Lower California, 
but not in the Cape Region. 
In California, it has been collected in Riverside County 
at San Jacinto, Riverside, Reche Canyon, the San Jacinto 
Mountains near Cabazon, and at Dos Palmos Spring, Santa 
Rosa Mountains, and in San Diego County at Twin Oaks, 
