580 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 98 
A single specimen of this form has been examined from near Cuaut- 
lapan, Veracruz (E.H.T.—H.M.S. Coll.). It has all the general char- 
acters of this form, except that a median cream stripe is present. 
It differs markedly from the related Eleutherodactylus natator from 
the same immediate region. 
ELEUTHERODACTYLUS AVOCALIS, new species 
Type.—U.S.N.M. No. 116885, collected at Tres Cruces, near Te- 
huantepec, Oaxaca, by Dr. and Mrs. Hobart M. Smith, March, 1940. 
Paratypes.—U.S.N.M. Nos. 116876-116884, 116886, Tres Cruces, 
near Tehuantepec; U.S.N.M. Nos. 116887—-116888, Cerro Arenal, 
Oaxaca. Same collectors, January 2-19, 1940. 
Diagnosis —A medium-sized species belonging to the rugulosus 
group, probably most closely related to Hleutherodactylus vocalis. It 
differs from that form in that the males lack a vocal sac; the tarsal 
fold extends three-fourths or more of the length of the tarsus, and is 
more elevated, forming a free flap; the extent of webbing on the toes 
is somewhat greater; the first finger is longer than the second; the leg 
is longer, the tibiotarsal articulation reaching beyond the tip of the 
snout. An M-shaped pattern is apparently present but indistinct. 
Description of the type.—The type, an adult female, is the largest 
specimen, having a snout-to-vent length of 51 mm.; snout rounding in 
profile, the nostril much nearer the median point of upper lip than eye; 
eyelid about equal to the interorbital width; length of eye (5.9 mm.) 
shorter than snout (7.5 mm.), but equal to its distance from anterior 
edge of nostril; canthus rostralis not or but indistinctly indicated; 
loreal region with a broad concavity; tympanum subcircular, small, its 
greatest diameter (3.1 mm.) very little more than half diameter of eye 
(5.9 mm.), separated from the eye by a distance about equal to the 
diameter. 
Tongue broadly cordiform, notched behind; vomerine teeth in two 
elevated areas between but considerably behind the choanae, ex- 
tending even to the level of the palatines, separated from each other 
by less than one-third the width of one group, separated from choanae 
by a distance greater than width of a group; choanae large, directed 
backward as much as downward; immediately behind choanae is a 
depression and a slitlike pit which lies close to the prevomer ridge; 
palatal mucous glands opening by a series of slitlike pores in the middle 
of the palate. 
Skin thick, with small smooth pustules; a heavy supratympanic fold, 
which curves down behind tympanum; two posttympanic tubercles; a 
pair of folds begin at corners of eyes and run back to the shoulders; 
indication of a second fold, tending to run parallel to the first; an ir- 
regular lateral fold with numerous short folds and tubercules; chin 
strongly areolate; abdomen areolate and wrinkled; ventral disk not 
indicated. 
