Vol. XI] VAN DENBURGH-SLEVIN— AMPHIBIANS AND REPTILES 53 



*83. Crotalus oreganus. N. 



84. Crotalus enyo. C. S. 



85. Crotalus mitchellii. N. C. S. 

 *86. Crotalus cerastes. N. 



[Clemmys marmorata]. N. 

 87. Pseudemys nebulosa. C. S. 

 *88. Chelonia agassizii. S. 

 *89. Eretmochelys squamosa. S. 

 *90. Caretta olivacea. S. 



3. Scaphiopus couchii Baird 



On the way from La Paz, at sea level, to San Pedro, at an 

 altitude of six hundred feet, the country passed through was 

 the floor of the desert, covered with a heavy growth of cactus, 

 mesquite, and various desert plants. Large numbers of this 

 spadefoot toad were collected on July 3 while traversing this 

 region. This proved just the proper time to secure any num- 

 ber of specimens, for thunder storms, accompanied by heavy 

 rains, at a temperature of seventy-five or eighty degrees, were 

 of daily occurrence. Immediately after the rains, the pools 

 of water left in the road would be swarming with toads. A 

 pool fifteen or twenty feet in length, and six feet or so wide, 

 would contain as many as a hundred or more. This was the 

 height of the breeding season, as nearly all the specimens ob- 

 served were copulating. They made a loud croaking noise and 

 would dive on one's approach, appearing again a few feet off, 

 the male still clinging to its mate. This was the only time this 

 species was observed, although several nights were spent in 

 this locality collecting with a light. 



4. Bufo boreas halophilus (Baird & Girard) 



A single young toad (No. 8579), captured at Ensenada in 

 July, 1905, affords the first definite record of this species in 

 the peninsula. 



5. Bufo punctatus Baird & Girard 



This species, although supposed to be more abundant in the 

 Cape Region than Scaphiopus couchii, was not found in such 



*Species which the Academy has not from Lower California. 



