General Discussion 



43 



hh. Tadpole to 27 mm; horny beak in upper 

 fringe i . 2-1 . 5, in first or second lower row 

 of teeth I . i-i . 2 or i . 2-1 . 3 ; horny beak 

 greater than 3rd row of lower labial teeth; 

 median space i . 1 5-2 . o, 1-4, or i . 3-3 . o 

 in either lateral part; third lower row of 

 teeth 1 . 3-1 . 5 or 1 . 4-1 . 5 in first lower row ; 

 one row of weak papillae from upper fringe 

 to end of third lower row of teeth with a 

 few scattering papillae at the side of the 

 labium; lower loop with only 2 or 3 scat- 

 tering papillae beside the outer row of 

 weak papillae : 



i . Mouth in interorbital distance .77-1. o, 

 average . 92 ; horny beak in upper fringe 

 1 . 2-1 .4; horny beak in first or second 

 row 1.1-1.2 times; third row in first 

 lower row i . 3-1 . 5 ; depth of tail in tail 

 length 1 . 25-2 . 7, average 1.97; spiracle 

 nearer eye than vent i .04-1 . 54, aver- 

 age 1.28; eye nearer snout than spiracle 

 1 .0-1 . 27, average i . 16; mouth larger 

 than internasal space i . 4-2 . 2, average 

 1.76; papillae of lower labial loop do 

 not extend under the end of the end of 

 the third row of labial teeth ; tail muscu- 

 lature in tail depth i . 26-2 .66, average 

 2 . 04 ; internasal space i . 2-1 . 6 in inter- 

 orbital distance, average 1.6; spiracle 

 1 .05-1 . 55 nearer eye than vent, aver- 

 age 1.28. Egg mass long file, partitions, 

 inner tube present. Eastern North 

 America, from Hudson Bay southwest 



Bufo americanus. 



ii. Mouth in interorbital distance 1.07- 

 -1.5; horny beak in upper fringe i . 4- 

 1.5; horny beak in first or second row 

 1. 2-1. 3; third lower row 1.3-1.6 in 

 first lower row; depth of tail in tail 

 length 2 . 88-3 . 83, average 3.33; spir- 

 acle nearer eye than vent 1.2 5- 1.7, 

 average 1.45; eye nearer snout than 

 spiracle i . o-i . 6, average i . 16 ; mouth 

 larger than internasal space i . i-i . 83, 

 average 1.47; papillae of lower labial 

 loop shghtly extend or do not at all 



