MEXICAN AMPHIBIANS—TAYLOR AND SMITH 597 
Ovando at an elevation of 2,800 to 6,000 feet. The tadpoles were 
taken in small streams and the adults were found in the same general 
region. ‘The tadpoles may be distinguished by having a serrated edge 
on the upper beak, the posterior serrations being fanglike. , 
The adults may be distinguished by the very blunt snout; the nos- 
trils at the extreme anterior end of snout; the areas surrounding them 
somewhat elevated; tarsal fold forming a long, free, flexible flap; toes 
webbed to the terminal disks, except on fourth toe, which has distal 
joint free (but with a fringe); tympanum almost hidden by thick 
pustulate skin; males with a vocal sac (not without as stated in the type 
description). The maximum known size of the female is 45 mm. 
Most of the 36 specimens are young. One young specimen was 
obtained at Finca Judrez; several young and one adult are from Las 
Nubes, 2,900 feet, on Mount Ovando, Chiapas. Seven adults were 
collected on Mount Ovando at 6,000 feet. 
All were taken in small streams, sitting on vegetation, on boulders, 
or, in one case, in the water. The single adult from Las Nubes is a 
male, which was calling from the water. Other males, as well as 
females, were collected at 6,000 feet, but here no young were seen. 
Young were very numerous at Las Nubes, where they were observed 
sitting on the leaves of low plants at the edge of the water. A single 
young specimen from Finca Juérez was found under similar conditions. 
The voice of the male of this species is much different from that of 
P. sagorum, being a single, sharp note that sounds very much like two 
pebbles struck together under water. The note is repeated at intervals 
of about two minutes. 
It appears that this species lays the eggs near streams. Certainly 
the young pass through their larval stages in the streams. Some 
transforming young were obtained and one tadpole of the species is at 
hand. 
PLECTROHYLA SAGORUM Hartweg 
FicureE 60, H; Puatre 30 
Plectrohyla sagorum Hartrwea, Occ. Papers Mus. Zool. Univ. Michigan, No. 437, 
June 30, 1941, pp. 2-5, pl. 1, figs. 1-3 (Mount Ovando, District of Soconusco, 
' Chiapas, Mexico).—Harrwra and Orton, Oce. Papers Mus. Zool. Univ. 
Michigan, No. 488, July 1, 1941, pp. 5-6. 
This series of 18 topotypic specimens, U.S.N.M. Nos. 111122- 
111138, was obtained April 15-16, 1940, on Mount Ovando at an ele- 
vation of 5,000 to about 7,000 feet. The specimens, adult and young 
transformed, were collected exclusively from bromelias, which grow 
in profusion at this elevation on the mountain. The eggs, however, 
are probably laid in water on the ground, as tadpoles presumably of 
this species, were obtained by Hartweg (loc. cit.). 
