i6 Field Columbian Museum 



four prefrontals. Lone Willow Springs, California, — scales 33-253-64; 

 length of body i,oi4nim.; tail i54mni.; four prefrontals, — scales 

 33-253-62; length of body i,045nini.; tail i6inini.; four prefrontals, 

 the two inner smaller than outer ones and not in contact with frontal. 

 Coso Valley, California, — scales 31-247-57; length of body i,T22inm.; 

 tail i48nim. ; four prefrontals, the middle suture extending a short 

 distance on frontal. Rose Station, California, — scales 33-224-56; 

 length of body 728mm.; tail 131mm.; four prefrontals. Trinidad, 

 Lower California, — scales 33-238-62; length of body 1,015mm.; tail 

 i4qmm. ; prefrontals two, each partially divided anteriorly by a 

 suture. 



This is a very variable species. I have compared the specimens 

 listed above with others from the west slope of the Sierras, and regard 

 all as belonging to one species. 



Family Crotalidse. 



Although the area included in this paper contains several species 

 of rattlesnakes, "not all were taken, because they are nocturnal, and 

 could not be found in the daytime. During warm nights they were 

 quite active, and their tracks were quite abundant." 



Crotalus tigris Kennicott. Tiger Rattlesnake. 



"The tiger rattlesnake is common in the sand dunes and in sandy 

 places at the heads of caiions in southeastern California, ascending 

 the east slope of the Sierras to about 6,000 feet. In the Inyo Moun- 

 tains it occurs at 8,000 feet. Those taken in sandy places are lighter 

 in color than when taken elsewhere. In sandy places this rattlesnake 

 has the habit of worming out shallow depressions, in which they 

 repose flush with the surface, which makes them difficult to see on 

 account of their protective coloration." Specimens of this species 

 were secured, as follows: Beveridge Caflon, California, — scales 23-183-25 ; 

 length of body 688mm.; tail 48.1mm. Lone Pine, California, — scales 

 23-178-20; length of body, si5mm., tail, 35.2mm. Wild Rose Springs, — 

 scales 23-181-19 ;length of body 625mm. ; tail 46mm., — scales 25-174-26 ; 

 length of body 708mm. ; tail 56mm,, — scales 23-177-24; length of body 

 707mm.; tail, 53mm., — scales 25-170-24; length of body, 750mm., tail. 

 58mm. — scales 23-180-26: length of body 716mm.; tail 56mm. Coso 

 Valley, California, — scales 23-176-21; length of body 6i8mm.; tail 

 35.2mm.,- sc.'iles 23-167-26; length of body 642mm.; tail 55.7 mm. 



