MEXICAN AMPHIBIANS—TAYLOR AND SMITH 557 
Since Kellogg’s list (1932, pp. 44-48) appeared, one other specimen 
of interest has been added to the National Museum’s collection, from 
San Juanito, Chihuahua (U.S.N.M. No. 95603). 
BUFO CANALIFERUS Cope 
PuaTE 21, Ficure 1 
Bufo canaliferus Corn, Proc. Amer. Philos. Soc., vol. 17, No. 100, July 20, 1877, 
p. 85 (Tehuantepec, Oaxaca, México). 
A large series, 129 specimens, of this species was obtained in the 
state of Chiapas; the following are cataloged: U.S.N.M. Nos. 115983- 
115992, Cruz de Piedra, April 21 to May 11, 1940; U.S.N.M. Nos. 
115993-116002, Colonia Soconusco, April 14 and May 9, 1940; 
U.S.N.M. Nos. 116003-116022, La Esperanza, April 14 to June 3, 1940; 
U.S.N.M. No. 116923, Rancho Las Gradas, 3 km. northeast of La 
Esperanza, May 20, 1940; and U.S.N.M. No. 116924, Tonal4, 
Chiapas, January 26-30, 1940. 
This small species seems to be confined to the southern part of 
México (for the most part south and east of the Isthmus of Tehuante- 
pec) and northern Central America (Guatemala). We regard the 
Orizaba, Veracruz, record given by Kellogg (1932, p. 40) as doubtful. 
The more obvious pattern variations do not seem sex-linked. Us- 
ually large dark spots are present on each side of the middorsal line, 
but some specimens have the dorsal surfaces unspotted and nearly 
uniform saffron-yellow. The largest male is 44 mm. Hight males 
have the vocal slit sinistral, six dextral. The largest female is 55 mm. 
snout to vent. 
In Chiapas the species is extremely common during the rainy season. 
It occurs in dense forest as well as on open plains. 
Five young specimens from Tapané, Oaxaca (U.S.N.M. No. 
10036), referred by Kellogg (1932, p. 41) to this species, actually are 
marmoreus. 
BUFO SIMUS Schmidt 
Bufo simus Scumipt, Denkschr. Akad. Wiss. math.-naturw. Classe Wien, vol. 14, 
1858, pt. 2, pp. 254-255, pl. 3, fig. 22 (Chiriquf River, in the vicinity of Bocas 
del Toro, Panam4). 
Of seven specimens, six (U.S.N.M. Nos. 116538—-116543) are from 
Tecamachalco, September 16, 1939, and one (U.S.N.M. No. 116544) 
from San Diego, Puebla, December 17, 1939. 
Two of the males have the vocal slit dextral; two have them present 
on both sides. In four of the specimens the skin, while pustulous, is 
very soft and smooth to the touch. Of these, two are males, two 
females; two others of the series from the same locality are rough with 
horny spines on the pustules. The tympanum is distinct but varies 
somewhat; in some it is more elongate oval than in others. 
