are marked with a few large black areas. There is a narrow light 

 streak down mid-back, with a black band or irregular black areas 

 on either side ofttimes breaking the midline. At the rear of the jaw 

 is a large russet tubercle and along the sides and on the arms are a 

 few small ones of similar color. Beneath, the toad is a bluish white, 

 sometimes speckled with black. 



This toad has no crests on the head but has a distinct rounded 

 ridge from the nostril over the outer edge of the eyelid. This gives the 

 canthal region a distinct border above and with the steep snout gives 

 the toad a square-snouted appearance. The head is not as short, 

 however, as in Bufo cognatus. The nostrils are widely separated. In 

 general shape, the toad reminds us of Bufo boreas halophilus. Its 

 color is intermediate between that form and the heavy inky blotches 

 and contrasting light areas of Bufo cognatus. 



Structure: Short, broad, raised parotoids close together; parotoid 

 interval less than the width of one gland; pattern of back extending 

 across parotoids making them less conspicuous, particularly in fe- 

 male; muzzle rounded; cranial crests lacking or slight in some males; 

 legs short; gland on hind leg; interorbital space narrow; internasal 

 space wide; warts few, low, flattened and rounded; foot with two 

 metatarsal tubercles; tympanum small; skin smooth and moist like 

 that of a Rana. 



Voice: The song is a sustained, rapid, melodious trill. 



Breeding: They breed during late spring and summer, May 20 

 to July 16. See Notes. 



Notes: "The Yosemite Toad undoubtedly hibernates for a con- 

 siderable period. . . . The hardihood of the species is indicated by 

 the way in which the adults jubilate in the melting snow water dur- 

 ing the spring and early summer months." (Grinnell and Storer, 

 1924, p. 658). 



Three young specimens in the University of Michigan collection 

 were examined. They were taken at Tuolomme Meadows, August 31, 

 1922. They measured 15, 16, and 16.5 mm. They showed a faint white 

 vertebral stripe; dark spot on inner half of each eyelid; spots along 

 vertebral line black, brown centered, and forward, sometimes en- 

 circled with whitish from vertebral line; quite spotted in pectoral 

 region. 



"June 5, 1930. Peregoy meadows. Saw at least two dozen old and 

 young. Majority were young. They were not so abundant as the 

 croaking tree frogs, Hyla regilla. Hadn't distinguished sexual di- 

 morphism until I found a mated pair in a very wet grassy meadow, 

 water three or four inches deep when one steps in it. These meadows 

 are surrounded by snow fields. Found no toad eggs. Toads must have 

 just come out." (C. E. Van Deman). 



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