Nemes 2nd Ranges. of the Rattlesnakes 

All the large rattlesnakes and several of the small species belong 
to.the genus Crotalus, of which 21 species or subspecies (including 13 
thet are considered specifically distinct) are recorded from the United 
States. The characteristics distinguishing these closely related rattle— 
snakes are too technical for presentation herté. Execllent werks contain— 
ing keys, range maps and photographs for the identification of rattle- 
snakes were published by Klauber (1936) and Gloyd (1940). These refer— 
ences may be purchased from the institutions publishing them. 
The scientific and vernacular names and statemsnt of the renges of 
Guer3 species Tollow: 
Crotalus adamanteus——Diamondbeck rattler. 
About swamps from southern North Carolina to Florida ote ule Keys, 
and westward to extreme southeastern Louisiana ; 
Crotalus atrox—lWestern diamondback rattler. 
Dry rocky aaa as well as agricultural districts from extreme 
southeastern Missouri southwestward through Arkansas, Oklahoma, 
Texas and ca Liexico, southern end western Arizona to southeastern 
Californie, and nortnern Mexico. 
Crotalus cerastes—Horned rattlesnake, o 
sands of desert plains in noni easyer Lower California, southern 
California, southwestern Utah, southern Nevada, and western 
Arizona. 
Crotalus viridis—Prairie rattler (and other common nemes for more 
~. western forms). 
British Columbia to Lower California an 
Great Plains from southern Can 
Crotalus ruber—Red rattlesnake. Sou 
into Lower California. 
Crotelus ee eee or timber, rattler and canebrake rattlesnake. 
In wooded, hill C 
ct 
O 
& 
ct 
a 

twara through the 
lifornia, southward 
9 Hn ® 
L 
aig ial feces ana along the coastal plain from southern 
Laine ae rd through Ohio and Indiana to southeastern Minnesota 
and eastern Nebraska, and southward to northern Florida and east— 
central Texas. 
Crotalus lepidus—Grcen rattlesnake. 
Mountéins from border region of southwestern Texas through south— 
western New Mexico to southeastern Arizona, and adjacent Mexico. 
Crotalus mitchellii—-Bieached or speckled and Panamint rattlers. 
Southwestern Nevada to centrai and southwestern Arizona, southern 
California and Lower California. 
Crotalus molossus—Dog-faced rattler, or black—-tailed rattler. 
West from southern Texas to north central Arizona, and the highlands 
of northern Mexico. 
Crotalus scutulatus—Mohave rattlesnake.. 
East from the Mohave Desert in California, through southern Neveda 
and southeastward through the southwestern half of Arizona, south— 
western New Mexico, southwestern Texas and southward on the 
Mexican Plateau. 
Crotalus tigri 
South Coe ab ao “ooutinard to central Sonora, Mexico. 

i) - = 3 
—-i- 
