952 16. CROTALIDE 
only as darker portions of the general ‘pepper and salt’ style 
of coloration. A dark band sometimes runs down and back 
from the eye. The tail is gray, with four to six black cross- 
bars. The lower surfaces are white or yellow, usually more 
or less clouded with brown. 
Thength’ to, anus 222 710 770 810 840 870 930 
Length of tail to rattle. 262 74 72 60 71 90 
Remarks.—This rattlesnake seems to be most nearly re- 
lated to C. tigris. It may usually be distinguished from 
that species by its black bands on the tail as well as by the 
granules between the rostral and anterior nasal plates. 
Distribution —This rattlesnake has been found in the 
Mohave and Colorado deserts of southeastern California, 
and in central Arizona, and ranges the whole length of the 
peninsula of Lower California. 
In Arizona, it has been found in the Tinajas Altas Range, 
about fifty miles southeast from Yuma, and on the Colorado 
River 20 miles above Picacho, Yuma County; on the Mo- 
have Desert and at the foot of the Needles, Colorado River, 
Mohave County; at Cave Creek, Maricopa County, and 
near Fort Whipple, Yavapai County. 
In California, it has been collected in Los Angeles 
(Fairmont), San Bernardino (Cushenbury Spring, Forest 
Home, San Bernardino Mountains, one mile east from Oro 
Grande, Victorville, Horn Mine, Turtle Mountains, 14 miles 
northeast from Blythe Junction), Riverside (Asbestos Spring, 
Santa Rosa Mountains, San Jacinto Mountains five miles 
southwest from Banning), San Diego (Mountain Springs, 
Campo, Boulevard, and Coyote Valley 25 miles east from 
Oak Grove) counties. 
Lower California records are Cape San Lucas, La Paz, 
Sierra El Taste, Miraflores, Sierra San Lazaro, Las Huavi- 
