602 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
entered from above. These places were also favorite hiding quarters 
of Bolitoglossa rufescens and B. platydactyla. Most of the series 
was secured during the dry season, but others were obtained during 
the rains (August). Included in the latter specimens are a number 
of females, none of which show evidence of a dorsal pouch. 
Family MICROHYLIDAE Parker, 1934 
Genus MICROHYLA Tschudi, 1838 
MICROHYLA OLIVACEA (Hallowell) 
Engystoma olivaceum HALLOWELL, Proc. Acad. Nat. Sci. Philadelphia, vol. 8, 
1856 (1857), p. 252 (type locality not definite, but presumed to be Kansas). 
Microhyla olivacea PARKER, A monograph of the frogs of the family Microhylidae, 
1934, p. 201. 
One specimen, U.S.N.M. No. 105161, was collected at Rio Santa 
Maria, Chihuahua, August 13, 1938. This form has a range ex- 
tending from Coahuila and Durango, México, to Nebraska. The 
specimens reported by Taylor (1940¢) from Sinaloa have recently been 
described (Taylor, 1943b), as Microhyla mazatlanensis. 
MICROHYLA USTA USTA (Cope) 
PLATE 32, FigurEs 1—4 
Engystoma ustum Cope, Proc. Acad. Nat. Sci. Philadelphia, vol. 18, May 1866b, 
p. 131 (Guadalajara, Jalisco). 
Engysioma mexicanum PETERS, Monatsb. Preuss. Akad. Wiss. Berlin, Dec. 
1869, p. 881 (state of Puebla [probably Matamoros]). 
Five specimens from the state of Veracruz are referred to this form 
as follows: Palma Sola, January 8, 1939, U.S.N.M. No. 116422; 
Potrero Viejo, February 28, June 13-18 and September 26, 1939, 
U.S.N.M. Nos. 116423-116426. 
Whether there is more than one recognizable form north of the Te- 
huantepec region cannot be stated at this time. No adequate 
series of specimens from the type locality are available in any museum. 
The type itself is in a deteriorated condition. It is possible that speci- 
mens from the plateau (Guadalajara and Guanajuato) are not the same 
as those from the lowlands of Guerrero, and Veracruz. The west- 
ern specimens are larger than those obtained elsewhere. A male 
from Colima measures 27 mm. from snout to vent, while three 
females measure 29, 29, and 30 mm. The Guerrero collections 
examined (H.H.T.-H.M.S. Coll.) have small males and large fe- 
males. Some variation in the relative size of the two tubercles of 
the metatarsus is evident but the inner is always equal or very nearly 
equal to the length of the first toe. | 
The specimen from Palma Sola was found in a clump of dead 
bromelias on the ground. 
