MEXICAN AMPHIBIANS—TAYLOR AND SMITH 57 
but lighter specimens may show spotting; the tympanum is brownish. 
The chin may be more or less brownish, with irregular cream spots 
on the lower jaw. In some specimens these markings are scarcely 
discernible. The underside of the outer part of the femur is brown- 
ish, with some black spotting at the knee. The underside of the 
foot is dark. The anal region has a triangular dark area or a black 
arched line. 
The inguinolumbar gland is greatly reduced, diffuse, and concealed 
by the pigment so that it is rarely evident. A small, flat axillary 
(or postaxillary) gland is evident in all. First finger longer than 
second; outer palmar tubercle present, sometimes apparently free, 
sometimes partly fused to the medial; several supernumerary tubercles 
on the soles and palms. The tibiotarsal articulation reaches to the 
anterior edge of eye or a slight distance beyond save in a young fe- 
male (without eggs) in which the heel reaches near to nostril. The 
tarsal fold (tubercle) is situated on tarsus back of the inner met- 
atarsal tubercle a distance less than the length of the tubercle, and 
terminates at its highest point before the middle of the tarsus is 
reached. ‘The tubercle is narrow and somewhat elongated. 
Most of the venter is smooth, but the back part of the ventral disk 
and its sides are usually granular; vomerine teeth large; males with 
a vocal sac. 
On the Pacific drainage of Chiapas occurs a variable species, iden- 
tical or at least closely related to the preceding. Individuals vary 
in color much as do the northern ones, some being pinkish, others 
fawn; occasional specimens have a hair-fine median light line. In 
general the measurements, character of the skin folds, metatarsus, and 
hand and foot markings agree very well with those of northern speci- 
mens, save that some specimens have a larger external metatarsal 
tubercle. However, in the Chiapas series are individuals or groups of 
individuals that, at least in the adult, vary in having a larger eye, a 
slightly longer snout in front of nostrils, and a heavier supratympanic 
fold folding down closer to the tympanum. There is less pigmentation 
on lower jaw, the loreal black stripe is dim or lacking, and the lip may 
show dark bars. 
While the shoulder ridges in the typical form run from the paired 
black shoulder spots direct to the corner of eye, in these the ridge may 
make a bend at two widely spaced occipital (or shoulder) spots and 
then direct themselves to a point on the eyelid somewhat more medial 
than the corner of eye. Often there is a pair of dark spots at the 
beginning of the two dorsolateral ridges. Sometimes the back may 
be somewhat checkered with darker, or there may be an indistinct, 
somewhat geometric pattern on the front part of the back. The under- 
side of arm and foot and the tarsus are usually lighter than in the 
typical form. 
