218 CALIFORNIA ACADEMY OF SCIENCES. 



many parts of Nevada and even in Utah. Throughout 

 most of this territory it is the only rattlesnake, but in 

 southern California is found with C. ruber, and possibly 

 meets C. confluentus in Idaho. In California it ranges 

 from the floor of the San Joaquin Valley up at least to 

 an altitude of 8,600 feet in the Sierra Nevada. I have 

 examined specimens from San Diego (De Luz, Bonsall), 

 Riverside (San Jacinto), San Bernardino, Kern (Delano), 

 Tulare (Kern River, Sheep Meadows), Fresno, Monterey 

 (Monterey, Jolon), Santa Cruz (Santa Cruz, Glenwood), 

 Santa Clara (Black Mountain, Smith Creek, Mt. Hamil- 

 ton, Los Gatos, Gilroy), Sonoma (Petrified Forest), Lake 

 (Lower Lake), Counties, California; Klamath Falls, 

 Oregon; and Twin Falls and Blue Lakes Canon, Idaho. 

 Habits. We have no special knowledge of the habits 

 of this species. For an account of the rattlesnakes in 

 general see Stejneger, Report of the U. S. National 

 Museum for 1893. 



73. Crotalus confluentus Say. PRAIRIE RATTLESNAKE. 



" ICrotalmus viridis, KAFINESQUE, Am. Month. Mag., IV, 1818, p. 



41." 

 Crotalus confluentus SAY., Long's Exped. Kocky Mts., II, p. 48; 



BAIED & GIRARD, Cat. N. A. Kept., Pt. I, Serp., 1853, p. 8; 



STEJNEGER, N. A. Fauna, No. 5, 1891, p. Ill; STEJNEGER, Kep. 



U. S. Nat. Mus., 1893 (1895), p. 440; BOULENGER, Cat. Snakes 



Brit. Mus., Ill, 1896, p. 576 (part). 

 Crotalus lecontei, HALLOW., Proc. Ac. Nat. Sci. Phila., VI, 1852, p. 



180 (type locality Cross Timbers). 

 1C. lucifer var. cerberus, COUES, Surv. W. 100th Merid., V, 1875, p. 



607 (type locality San Francisco Mts., Ariz.). 

 Crotalus confluentus var. pulverulentus, COPE, Proc. Ac. Nat. Sci. 



Phila., 1883, p. 11 (type locality vie. Lake Valley, New 



Mexico). 



Description. Moderate. Head broad, flat-topped, 

 varying in outline according to position of fangs, etc. 

 Rostral much higher than wide, in contact with anterior 



