webbing
between fingers.

_Remarks._--At the type locality, a shallow rocky stream in pine
forest, _Hyla charadricola_ was found beneath rocks at the edge of
fast moving sections of the stream and beneath rocks in shallow
riffles in the stream. Most of the frogs were in water. At night
they were found sitting on rocks in the stream. _Hyla miotympanum_,
which is abundant at the type locality, lives in bushes and beneath
rocks along the stream but usually is not found in the riffles inhabited
by _Hyla charadricola_. At Lago de Tejocotal _Hyla charadricola_
was found beneath rocks near the shore of the lake and by a
stream in the pine forest. Individuals were found on low vegetation
over-hanging a small stream in pine-oak forest four kilometers southwest
of Tianguistengo.

Five recently metamorphosed young (KU 58424-9) found at the
type locality on June 8, 1960, have snout-vent lengths of 22.4 to
24.0 (average 23.2) mm. The young are colored like the adults,
except that in life the dorsum is a brighter green and the flanks are
more yellow than tan and have less dark spotting than in adults.

_Distribution.--Hyla charadricola_ inhabits streams in pine and
pine-oak forests at elevations of 2000 to 2300 meters in northern
Puebla and eastern Hidalgo (Fig. 2).

Specimens examined.--HIDALGO: Lago de Tejocotal, 11 km. E
Acaxochitlan, KU 58438, UMMZ 104032, 118165; 4 km. SW Tianguistengo,
KU 53811-2. PUEBLA: _11.7 km. W Huachinango_, UMMZ 121567 (5); Rio
Totolapa, 14.4 km. W Huachinango, KU 53813-5, 55624, 58414-37, 59813
(skeleton), 59886 (skeleton), MCZ 34964-5, UIMNH 50966, UMMZ 118166
(5), S-2242 (skeleton).

#Hyla robertsorum# Taylor

_Hyla robertsorum_ Taylor, Univ. Kansas Sci. Bull.,
26:393-396, figs. 5-6, November 27, 1940 [Holotype.--CNHM
100124 (formerly EHT-HMS 16264) from El Chico Parque
Nacional, Hidalgo, Mexico; Mr. and Mrs. Radclyffe Roberts and
Edward H. Taylor collectors]; Univ. Kansas Sci. Bull.,
28:310, November 15, 1942. Taylor and Smith, Proc. U. S.
Natl. Mus., 95:589, June 30, 1945. Smith and Taylor, Bull. U.
S. Natl. Mus., 194:87, June 17, 1948; Univ. Kansas Sci.
Bull., 33:333, March 20, 1950. Rabb and Mosimann, Occas.
Papers Mus. Zool. Univ. Michigan, 563:1-9, March 29, 1955.
Duellman, Univ. Kansas Publ. Mus. Nat. Hist., 15:48, December
20, 1961.

_Diagnosis._--Maximum snout-vent length in males, 48 mm.; snout in
dorsal profile rounded; tarsal fo