f. Mouth small (4.1-4.7 in L.); tym- 

 panum small (14-22 in L.); head nar- 

 rower (2.5-3.1 in L.); head shorter 

 (3.4-3.9 in L.); crests, a boss, from 

 snout to rear of eye, with sides paral- 

 lel. 

 Canadian toad. Bufo hemiophrys. Plate XIX. 



ff. Mouth large (3-3-4-3 i. n L.); tym- 

 panum large (10-18.2 in L.); head 

 wider (2-3 in L.). 

 g. Crests prominent with knobs in 

 rear; skin finely and evenly 

 roughened with tubercles be- 

 tween larger warts; red, gray or 

 black. 

 Southern toad. Bufo terrestris. Plate XXIII. 



gg. Crests low; paired spots of 

 darker color down back, super- 

 ciliary crests meeting postorbital 

 at right angles. 

 h. Small uniform warts on 

 back; several warts in each 

 dark dorsal spot; dark pec- 

 toral spot; no preparotoid 

 longitudinal crests; under 

 parts usually unspotted; 

 back greenish; size smaller 

 2-3 1/4 inches (51-82 mm.). 

 Fowler's toad. Bufo fowler i. 



Plate XVIII. 



hh. Large dorsal warts; single 

 wart in each dark dorsal 

 spot; under parts spotted or 

 plain. 

 1.. Many warts spiny, par- 

 ticularly on hind legs; 

 parotoids parallel, clos- 

 est together at mid- 

 point; parotoid on dorso- 

 lateral line or on dorsum; 

 no boss, preparotoid 

 longitudinal crest pres- 

 ent. 



American toad. Bufo 

 americanus americanus . Plate X. 



19 



