8 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



2.4-3.5, average 2.8; tail tip obtuse; second upper row in upper fringe 

 J^ to ^; median space in second upper row IJ^ in either lateral part; 

 third lower row in first lower row yi to Yt shorter; teeth % rarely %. 

 Transformation size 43-59 mm. 

 Egg mass, surface film. 

 North America east of Rockies. (PI. 2, fig. 1.) Rana catesbeiana, 



h!^. Tadpoles to 84-100 mm.; eye on or just above lateral axis; tail tip acute or 

 acuminate (rounded in R. onca) teeth %; second upper row in upper fringe 

 Yf, to Yi5', median space in second upper row 2.5-11 in either lateral part; 

 third lower row in first lower row Y^ to Y^ shorter. 



■i'. Depth of tail in length of tail 1.45-1.8, average 1.7; tail tip acuminate; 

 dorsal crest equal or less than tail musculature; mueiferous crypts indistinct; 

 spiracle 1.08-1.44 nearer vent than snout; mouth in interorbital distance 

 1.5-2.37, average 1.94; internasal space in interorbital distance 1.8-2.6, 

 average 2.16; second upper row Yt to Yi of the upper fringe; median space 

 of second upper row 2^ to 43^ times either lateral row; third lower row 

 1.5 less than horny beak, much shorter than single row of lower labial 

 papillae and J^ shorter than first lower row of teeth; first row of lower 

 teeth equal to horny beak. Transformation size 32 or 37-48 mm.; egg 

 mass, a surface film. 

 Georgia, Florida-Louisiana. (PI. 3, fig. 7.) Rana grylio. 



»2. Depth of tail in length of tail 2.5-4.7 averages 3.1-3.87; tail tip acute; dorsal 

 crest less than tail musculature; mueiferous crypts distinct; spiracle 1.07- 

 1.8, nearer vent than snout; mouth in interorbital distance 1.3-1.8, aver- 

 age 1.5; internasal space in interorbital space 1.25-2.0 averages 1.6-1.75; 

 second upper row ^ to Ms of the upper fringe; first lower row of teeth 

 equal to or greater than horny beak; spiracle 1.1-1.8 nearer vent than 

 snout. 



j^. Tadpoles to 99 mm.; transformation sizes at 29-38 mm.; depth of tail in 

 length of tail 3.2-4.7, average 3.87; spiracle just touches lateral axis; 

 eye just above lateral axis; spiracle 1.06-1.38 nearer eye than base of 

 hind legs or vent, average 1.24; spiracle 1.25-1.6 nearer eye than vent, 

 1.45; mouth in interorbital distance 1.3-1.75, average 1.55; width of body 

 in its own length 1.3-2.1, average 1.56; third lower labial row of teeth 

 1.25 less than horny beak, about equal to single row of lower labial papiUae, 

 }i shorter than first lower row; sometimes a row of inner papillae below 

 the third lower row of teeth; median space in second upper labial row 

 3.&-4.5 times either lateral portion; second upper row H to ^s of the 

 upper fringe; belly straw yellow, colonial buff or deep colonial bufi"; tail 

 with round cartridge buff or pinkish cinnamon spots; no black line in 

 dorsal crest as in Rana grylw or R. virgaiipes. 

 Eggs in a compact submerged mass. 

 Hudson Bay-Minnesota, New York-New England. (PI. 3, fig. 3.) 



Rana septentrionalis. 



j^. Tadpoles to 92 mm.; transformation sizes at 25-38 mm.; depth of tail in 

 length of tail 2.5-3.7, spiracle just below lateral axis; eye on lateral axis; 

 tliird lower labial row of teeth 1.5-1.25 less than horny beak, much shorter 

 than single row of lower labial papillae, almost }/2 shorter than first lower 

 row; median space of second upper row 6-11 times the length of either 

 lateral portion; second upper row Vis to Yis of the upper fringe. 



ft'. Spiracle nearer vent than snout 1.35-1.8; mouth 1.3-1.8 times in interorbital 



distance, average 1.5; width of body in its own length 1.25-1.7, average 



1.47; belly deep cream color; tail green mottled with brown and covered 



with fine yellow spots. Egg mass, surface film. 



Canada-Louisiana-Florida- New England. (PI. 3, fig. 6.) Rana clamitans. 



