19 16 ] Camp: Amphibians and Reptiles r>:jr> 



The writer is by no means convinced that this rattlesnake is ex- 

 clusively nocturnal in habits as suggested by Meek (1905, p. 18). 

 Both at Needles and near Blythe Junction individuals were traced bj 

 the characteristic tracks in the sand. Each was found closely coiled in 

 a symmetrical pad and partly buried flush with the surface in the 

 hot sand right out in the noonday sunshine of midsummer. In neither 

 case were the snakes easily seen, as they were of the exact color of 

 their sandy surroundings. Both, though alert, allowed themselves to 

 be noosed without moving away or doing more than rattle feebly. 

 That they eat the diurnal lizards TJta and Cnemidophorus (see Van 

 Denburgh and Slevin, 1914, p. 429) is an evidence of daytime activity. 



Transmitted August ~ y O, 1915. 



