7() BULLETIN OF WISCONSIN NATURAL HISTORY SOCIETY. VOL. 2, NO. 1. 
to each other backward. They are placed between the nares, their 
anterior edges nearly in the same transverse line with those of the 
nares and extending a little beyond the nares posteriorly." It 
will be noted that the position of the vomerines is remarkably 
anterior as compared with other of our small American hyloids. 
The openings of the Eustachian tubes are very minute. 
The gular fold is w^ell developed. 
Quantitative data were taken for a number of characteristics 
selected either because ( i ) they were apparently variable here, or 
1^2) known to vary throughout its range, these characteristics 
being known to me because given as diagnostic between the two 
subspecies into which the northern and southern forms have been 
grouped. 
METHODS. 
The measurements were taken in m. m. in most cases, but in 
one-half and one-tentli m. m. in the smaller measurements. 
The measurements were recorded as falling into the classes 
4-4.99 1"^^-' ^'tc, or 4-4.09, etc., as the case might be. These 
measurements were then converted into per cent of total lengths 
by means of Zimmerman's Calculating Tables. The middle value 
of the two classes concerned being used as 24.5 divided by 28.5. 
The percentages were grouped in the same way as the original 
measurements. In some cases, where certain fractions not involv- 
ing the total length had been used by systematists in describing 
this species or its subspecies, these percentages were also de- 
termined and seriated. 
Where the resulting polygons were irregular owing to the use 
O'f too many classes for the number of individuals, they were 
grouped into larger classes, as few as possible being brought to- 
gether to make the new classes. Of the several possible limits 
those were chosen which approached most nearly the theoretical 
curve, the sex and total length being known for each measure- 
ment. The extreme classes of each polygon were examined to find 
if any correlation existed between sex or age and any of the chai»^ 
acteristics examined. This confessedly crude method revealed 
none except between sex and length. ^ 
MEASUREMENTS. 
Length. — I found the length to vary from 20 m. m. to 30 m. 
m., the mode being 25-26 m. m. The dotted lines in polvgon A 
represent the polygon for males, from which it is seen that the 
males are shorter than the females. 
