MEXICAN AMPHIBIANS—TAYLOR AND SMITH 553 
BUFO ANGUSTIPES, new species 
Figure 59 
Type.—U.S.N.M. No. 116513, female, collected at La Esperanza, 
Chiapas, April 7, 1940, by Dr. and Mrs. Hobart M. Smith. 
Diagnosis.—A large toad of the Bufo marinus group, characterized 
by having slender limbs; the tibiotarsal articulation reaching the tym- 
panum; the foot elongate, slender; tubercles on body low, indistinct, 
belly nearly smooth except for indistinct, smooth-surfaced granules; 
tarsal fold present; tympanum large,subcircular,not encroached upon by 
the parotoid. Areasurrounding tympanum entirely smooth; diameter of 
tympanum four-fifths of eye; parotoid roughly triangular, moderately 
large, reddish (see fig.). 
Description of type-—Head broad, its width (49 mm.) greater than 
its length (88 mm. to posterior end of jaw). The longitudinal diam- 
eter of the orbit, measured on inner edge of the crests, 16.8 mm.; 
diameter of eye 11 mm.; diameter of tympanum 8 mm.; length of snout 
12 mm.; width of an eyelid (9 mm.) twice in interorbital distance; 
snout truncate; choanae large, the palatal glands opening by two 
outlets near the mner edge of choanae; palatine with dentate 
rugosities; tongue narrow, elongate, subquadrangular. 
Parotoid smooth, moderate, its length (34 mm.) slightly less than 
length of head; its width measured on the curve, 32 mm.; skin over 
body smooth, with a few smooth tubercles; hindlimbs with low, indis- 
tinct, smooth tubercles; ventral surfaces smooth, with slight indication 
of fine granulation in posterior abdominal region. 
Limbs slender; digits likewise slender; first finger longer than second; 
second slightly shorter than fourth; inner palmar tubercle moderate, 
outer (medial) very large, nearly as wide as long; outer tubercle on 
third finger not distinctly bifid; toes about one-third webbed, the 
subarticular tubercles indistinct; inner metatarsal tubercle small, flat; 
outer small, rather indistinct. 
Measurements —For purposes of comparison, after the measure- 
ments (in mm.) of the type of B. angustipes we give those for a speci- 
men of comparable size of B. horribilis from Chiapas (H.H.T.-H.M.S. 
No. 3880). Both specimens are females. Snout to vent, 127, 133; 
width of head, 47, 45; length of head, 31, 33; width between supra- 
tympanic crests, 43, 40; length of bony orbit (inside crests), 18, 15.5; 
height of tympanum, 7, 8; length of same, 5.5, 6.5; length of parotoid, 
34, 38; arm, 76, 68; leg, 162, 147; femur, 50, 47; foot, 79, 67; elevation 
of snout at front of eye, 13.5, 15.8. . 
Remarks.—That this is a very different form from Bufo horribilis of 
Veracruz, or the variety occurring in Chiapas, is evident. It likewise 
differs from more southern ‘‘Bufo marinus.”’ We suspect it to be a 
much smaller species than either horribilis or “marinus.” 
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