MEXICAN AMPHIBIANS—TAYLOR AND SMITH 549 
the bromelia itself is the important factor. It is quite obvious why 
B. platydactyla, since it is large, does not occur in the spread-leaf 
bromelias, the leaves of which are so closely placed and narrow that 
the protection afforded is inadequate. But why B. rufescens does not 
occur in the urn-shaped bromelias, which certainly hold sufficient 
water, is not so apparent. A possibility is that its thigmotropic 
sense is involved. Both B. platydactyla and B. rufescens are positively 
thigmotropic, as shown by their abundance in banana sheaths. ‘This 
sense is satisfied for B. platydactyla in the urn-shaped bromelia, but 
perhaps not so satisfactorily for B. rufescens. It would be submerged 
in water if it crawled toward the base far enough to be wedged be- 
tween the sides of adjacent leaves, while its situation would be pre- 
carious if it remained elsewhere, for the leaves are not closely approx- 
imated, except toward the top and at the base. 
A group of about 30 eggs taken in a bromelia at a point 3 miles north 
of Huichihuayén, San Luis Potosi, December 12, 1939, contains em- 
bryos which are certainly of this or a very closely related species. No 
adults of this species have been obtained so far north. 
BOLITOGLOSSA OCCIDENTALIS Taylor 
Bolitogtossa occidentalis TayLor, Univ. Kansas Sci. Bull., vol. 27, pt. 1, No.8, Nov. 1, 
194le (Dec.), pp. 145-147, fig. 1c, pl. 9, figs. 1, 2 (La Esperanza, Chiapas). 
This form is represented by 33 specimens, including the type, 
U.S.N.M. No. 111085, from La Esperanza, Chiapas, April 7, 1940, 
to May 138, 1940; and paratypes, U.S.N.M. Nos. 111068—-111084, 
111086—111098, topotypes. 
This species, with a toothed maxilla, appears to be confined to the 
Pacific drainage at relatively low elevations. On the Atlantic drainage 
it appears to be replaced by B. rufescens, a form with the maxillary 
teeth lacking. 
All the specimens from La Esperanza were captured at night, crawl- 
ing on the grass or on Calladium leaves at the edge of a small stream. 
One from Finca Judrez was found crawling along the retaining wall of 
an irrigation ditch at night. 
BOLITOGLOSSA TOWNSENDI (Dunn) 
Oedipus townsendi DUNN (part), Proc. Biol. Soc. Washington, vol. 35, 1922, p. 5 
(Cerro de los Estropajos, near Jalapa, Veracruz) (the type series includes a 
specimen [M. C. Z. No. 8018] of B. dimidiata). 
Bolitoglossa townsend: Tayutor, Univ. Kansas Sci. Bull., vol. 27, 1941d, p. 107. 
Three specimens, U.S.N.M. Nos. 1110138-111015, as well as an un- 
numbered lot containing 10 very young specimens that we believe are 
of this species, are in the collection from Cuautlapan, Veracruz, 
secured in July 1940. 
