A NEW BULLFROG— STEJNEGER. 
213 
'riie third toe, .siiiiihirly niotisured, 41 niiii. (varviniL»- l)otweoii -tO 
null, and 4li iiini.). 
Conversely, a Rami aitcshcldud of exactly the .same size (fourtli toe 
50 mm.), should normally have — 
The tirst toe, similarly measured, 15 mm. (varying ])etween 13.5 
mm. and 1(),5 mm.). 
The second toe. similarly measured, ^4.5 mm. (varying between 23.5 
mm. and 25.5 mm.). 
The third toe, similarly measured, 36.5 mm. (varying between 35 
mm. and 38 mm.). 
These average jjroportions are shown diagram maticallj" in the accom- 
panying figure, in which the dotted outline represents an average B. 
yn/Iio and the solid lines an average liidia catesbelana. 
These ditt'erences in the relative length of the toes, being capable of 
the most concise definition, have been utilized 
primarily for the characterization of the new 
species, but there are numerous other fea- 
tures which prove it to be very distinct from 
R. catesheiana. Thus for instance, the snout 
is much shorter and less high, so that the 
nostrils appear to be nearer the tip of the 
mouth; the head is also narrower behind; the 
\omerine teeth are very close together, with 
hardly any space l^etween the two patches; 
the tongue is much broader and thinner, with 
remarkal)ly long and thin "horns," which are 
very far apart; the color is apparently much 
darker brown, though there may be li. cates- 
hrlana nearly as dark. Add to this the differ- 
ence in voice and we have clearly one of the most 
distinct species of frog in the United States. 
The general habitus of R. grylio is that of 
R. catesheiana^ including the large tympanum and the absence of a 
dorso-lateral glandular fold. It is also a large frog, though whether it 
reaches the extreme size of R. catesbelana ma}^ be doubted. 
The range of the new species is as yet known but f ragmentarily, as 
we have specimens only from southern Florida, Pensacola, Florida, 
and Bay St. Louis, Mississippi. The habitat of R. grylio is thus 
parth^ occupied by R. (Xitesheicma, which certainl}^ occurs in northern 
Florida and on the Gulf coast reaches New Orleans. The overlapping 
of the two forms afi'ords additional evidence of their specific distinct- 
ness, if such were needed. It ma}^ be mentioned in this connection 
that the most southern specimens of R. catesbeiana do not show the 
slightest tendency of a variation toward R. grylio^ as is clear!}- proven 
by the measurements in the appended tables. 
DiAGEAMMATIC OUTLINES OF 
HIND FEET OF R. catcsbeiaiia 
AND R. grylio, the former 
IN SOLID LINES AND THE LAT- 
TER DOTTED. 
