ecies of _Bufo marmoreus_, instead of an
allopatric species.

~Bufo perplexus~ Taylor

_Bufo perplexus_ Taylor, Univ. Kansas Sci. Bull., 29:347,
October 15, 1943.--Balsas River near Mexcala, Guerrero,
Mexico.

Aguililla (2); Apatzingan (42); Buena Vista (5); Capirio
(3); La Playa (25); Lombardia (6); Nueva Italia (9); Rio
Cancita, 14 km. E of Apatzingan; Rio Tepalcatepec, 27 km. S
of Apatzingan; San Salvador (4); Tzitzio; Volcan Jorullo.

~Bufo occidentalis~ Camerano

_Bufo occidentalis_ Camerano, Atti R. Accad. Sci. Torino,
14:887, December 31, 1878.--Mexico. Type locality restricted
to Guanajuato, Guanajuato, Mexico, by Smith and Taylor
(1950a:330). Firschein, Copeia, no. 3:220, September 15,
1950.

_Bufo simus_, Smith and Taylor, Bull. U. S. Natl. Mus.,
194:42, 1948.

Barranca Seca (32); Cerro de Barolosa (4); Cerro Tancitaro,
3 km. E of Apo (2); Cerro Tancitaro, 19 km. E. of Apo (10);
Charapendo; Coalcoman (7); Dos Aguas (4); Jacona, Jaramillo
(2); Las Tecatas; Los Reyes (181); Tancitaro (10); Uruapan
(3).

This toad is an inhabitant of pine and oak forests between 900 and 2400
meters. Near Charapendo on the slopes of the Sierra de los Tarascos and
at Coalcoman it apparently reaches its lowest altitudinal limits. At
both of these localities the pine-oak forest is replaced by arid
tropical scrub forest on the lower slopes.

Twenty-four tadpoles were collected on May 3 in a quiet section of a
fast stream near Barranca Seca. The tadpoles have a robust body,
broadest about two-thirds the distance from the snout to the posterior
edge of the body, half again as broad as deep. Eyes dorsolateral;
nostrils dorsal, somewhat directed forward, and about three-fifths the
distance from the tip of the snout to the eye; spiracle sinistral and
lateral, located at about midbody; anus median; tail long and slender;
tail-musculature extends nearly to tip of tail; depth of
tail-musculature at mid-length about one-third total depth of tail;
dorsal tail-fin not extending onto body (Fig. 5); average body length of
ten tadpoles having small hind limb buds, 14.4 mm.; average tail length,
22.0 mm.

Mouth ventral, nearly terminal, about one-third as wide as widest part
of body; anterior lip has no papillae; lower lip bordered by two rows of
papillae and lateral lips by one row of papillae; beaks moderately well
developed, the uppe