560 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
116972, San Juanito, near Palenque, July 7-23, 1939; U.S.N.M. Nos. 
116967—116971, ruins of Palenque, near Palenque, July 10, 1939. 
Tasasco: U.S.N.M. No. 116986, Tenosique, June 30, 1939; U.S.N.M. 
Nos. 116987-116989, Santo Tomdés. HipauGo: U.S.N.M. Nos. 
116984—116985, 6 km. south of Santa Anita, October 10, 1939. Tam- 
AuLIPAS: U.S.N.M. No. 106254, Hacienda La Clementina, 4 miles 
west of Forl6n, November 22, 1938; U.S.N.M. No. 106255, Villagran, 
December 17, 1988. Guatremaua: U.S.N.M. Nos. 116981-116982, 
Pozo de la Jicotea, 5 miles south of Piedras Negras, June 3, 1939; 
U.S.N.M. Nos. 116973-116980, 116983, Piedras Negras, May 21 
to June 2, 1939. 
The series from the northern part of the range differs rather con- 
siderably from those in the southern part of the range. One of those 
from Hidalgo (northern) is by far the largest specimen, having a snout- 
to-vent length of 100 mm. It likewise is from an elevation probably 
higher than any other specimen (4,500 feet). The fringe on the toes 
is greater than obtains in the southern specimens (Tabasco, Campeche, 
Guatemala, etc.), and the outline of the anterior part of the head is 
distinctly rounded. 
Of the southern specimens the largest measured 80 mm. In these 
there is less dorsal marking, many of the specimens being largely amber 
or clay-colored above, with slight interorbital dark spots or a nar- 
row bar and with a few dark flecks on back somewhat symmetrically 
arranged; the bars on the legs are dim. 
The series from the Palenque ruins is composed entirely of young, 
20.5 mm. to 27.5 mm. in length; all have the skin of the venter 
smoother and with much more dark pigment than occurs in other 
specimens. 
When the young of a northern specimen is compared with the south- 
ern there are noticeable differences in the character of tubercles, 
especially the dorsolateral row, in the shape of the snout, the eleva- 
tion, and size of the tympanum. The crests appear at an earlier age 
(smaller size) in southern specimens. 
Though this southern form is probably separable from the north- 
ern, the matter cannot be decided now. Moreover, granted that it 
is separable, the types would need to be examined to ascertain whether 
the name valliceps should apply to the northern or southern form. If 
to the latter the name nebulifer Girard would be available for the 
northern form. 
Acquisitions to the National Museum since Kellogg’s list appeared 
(1932, p. 71) include No. 83394, Matamoros, Tamaulipas; No. 84418, 
Motzorongo, Veracruz; and No. 84417, Puebla, Puebla (probably an er- 
roneous locality as the species is unknown on the high plateau). Since 
valliceps does not occur north of the Isthmus of Tehuantepec on Pacific 
