44 THE BAYLOR BULLETIN 



range. It is pugnacious, quick to sound its rattle 

 and throw itself on the defensive. Because of its 

 prevailing color of olive green, we always referred 

 to it as the 'green rattlesnake.' " 



137. Crotalus atrox Baird and Girard. Texas Rattlesnake : 



Western Diamond Rattlesnake. 

 Middle and Southern Texas, from the southeastern 

 corner of the Panhandle south to the Mexican bound- 

 ary, east in the Rio Grande Country to the coast. A 

 line from the eastern boundary of Wichita County 

 drawn through Waco straight down to the mouth 

 of the Colorado River will roughly indicate the east- 

 ern limits of its range. West it extends 'almost to 

 the foot of the plains and ranges along both sides 

 of the Pecos and Rio Grande Rivers into the southern 

 plains, the trans-Pecos counties and Mexico. It ap- 

 parently does not inhabit the higher elevations in the 

 trans-Pecos district. The peculiar form known as 

 Crotalus scutulatus Kennicott is recorded from Duval 

 County by Boulenger and from Pecos by Brown, and 

 I have it from the western part of El Paso County. 



138. Crotalus confluentus Saij. Plains Rattlesnake. 



This rattlesnake inhabits the plains of Western 

 Texas. Cope records it from the head of Red River, 

 Canyon Blanco and Haskell County, Bailey mentions 

 it from Amarillo, and I have collected it near Mid- 

 land. Boulenger records a specimen in the British 

 Museum from Duval County. Many of the locality 

 labels on early National Museum specimens are 

 rather indefinite, but the collection contains speci- 

 mens from San Antonio, Pecos River, and the Rio 

 San Pedro (Devil's River). 



139. Crotalus horridus Lmn. Banded Rattlesnake. 



This is the "timber rattlesnake" of Eastern Texas 

 and is widely distributed. Vernon Bailey's map in 

 the Report on the Biological Survey of Texas, show- 

 ing the distribution of this species, would have been 



