AMBLYSTOMA.—SPELERPES. 297 
The types of S. dumerilii, Dugés, were from the Laguna de Patzcuaro, and those of 
S. tigrina, Velasco, from the Lago de Santa Isabel, near Guadalupe Hidalgo, in the 
valley of Mexico. 
2. Amblystoma altamirani. 
Amblystoma altamirani, Dugés, La Nat. Mex, 1896, p. 459, t. 29%, 
Hab. Mexico, Monte de Las Cruces (Dugeés). 
Palatine teeth in two straight oblique lines, commencing near the hind margins of 
the choane, and converging in a forward direction, not continuous in front. A pair 
of tarsal and carpal tubercles, small, but distinct. Tips of the fingers and toes hardened. 
Tail strongly compressed. Twelve costal grooves. Olive above, densely marbled with 
darker; uniform light-coloured below. 
Dugés. N. H. Mus. 
Totallength. ©. 2. 2. 2. 2. 2 2 2... 247 millim. 160 millim. 
Length of tail. 2. 2. 2... 148 » 91 sa, 
Dr. Dugés states that this species is confined to considerable altitudes. The specimen 
in the Natural History Museum has completed its metamorphosis. 
SPELERPES. 
Spelerpes, Baird, Journ. Ac. N. Se. Philad. i. p. 283 (1847) ; Bouleng. Batr. Grad. p. 60. 
Geotriton, Bonap. Faun. Ital. 
Geotriton, Cylindrosoma, Gidipus, Pseudotriton, Tschudi, Batr. pp. 93, 94. 
Bolitoglossa, Dum. et Bibr. Erpét. Gén. viii. p. 88. 
Cidipina, Keferstein, Arch. f. Naturg. 1868, p. 299. 
Ophiobatrachus, Gray, Ann. & Mag. N. H. 1868, ii. p. 297. 
Palatine teeth in two straight or oblique transverse series; parasphenoid teeth 
present. ‘Tongue free all round, supported by a central pedicel. Toes five. Tail 
cylindrical or slightly compressed. Nostrils small. 
Much uncertainty exists in the distinction of the Central-American species. ‘The 
technical characters on which they have been established, such as the extent of the 
interdigital web, the length of the tail, the extent of the palatine series of teeth, 
the degree of separation of the parasphenoid groups, the coloration, &c., must be 
subject to some variation ; but without a much larger series of well-preserved examples 
than exists in any museum, or, at any rate, is at my disposal, it is impossible to 
ascertain the degree of variation within the limits of a species. At present, I am 
inclined to think that the number of species has been unduly multiplied. 
* IT have not been able to verify this reference, no copy of the volume of the work being in any of the 
London libraries; my information is based upon MS. notes kindly communicated by Dr. Dugés, and upon a 
specimen sent by him to the Natural History Museum. 
