Contents 



Preface viii 



Contents ix 



General account i 



Common names i 



Scientific name 2 



Range 3 



Habitat 3 



Size 3 



General appearance 4 



Structure 4 



Voice 5 



Breeding 7 



Eggs . , 7 



Tadpoles 9 



Development and transformation n 



Notes 1.2 



Keys 13 



Accounts of species (with a plate of each species) .... 36 



Bell toads 3 6 



American bell toad. Ascaphus truei 36 



Spadefoots 38 



Couch's spadefoot. Scaphiopus couchii 38 



Hammond's spadefoot. Scaphiopus hammondii ... 40 



Holbrook's spadefoot. Scaphiopus holbrookii holbrookii . 42 

 Key West spadefoot. Scaphiopus holbrookii a/bus (no 



plate) . 43 



Hurter's spadefoot. Scaphiopus holbrookii hurterii (no 



plate) " 44 



Toads 4^ 



Colorado River toad. Bufo alvarius 46 



American toad. Bufo americanus americanus .... 48 

 Hudson Bay American toad. Bufo americanus copei (no 



plate) 49 



Northwestern toad. Bufo boreas bore as 50 



California toad. Bufo boreas halophilus 52 



Southern California toad. Bufo californicus .... 54 



Yosemite toad. Bufo canorus 56 



Great Plains toad. Bufo cognatus 58 



ix 



1 2 4 2 



