MOLGE.—AMBLYSTOMA. 295 
the eye, are more developed in the male than in the female, in which they may be 
entirely absent. Fingers and toes depressed, free; inner finger and inner and outer 
toes very short, outer finger at least half as long as the adjoining. Olive above, 
marbled with lighter and with blackish specks; yellowish or orange-coloured below, 
with larger round black spots. 
dé. 2. 
Total length. . 2. . 2. 2... 2)... 104 millim. 112 millim. 
Lengthof tal. 2. 2...) . . BA, 58 OC, 
AMBLYSTOMA. 
Amblystoma, Tschudi, Batr. p. 92; Bouleng. Batr. Grad. p. 38. 
Siredon, Wagl. Syst. Amph. p. 209 (larval form). 
Axolotes, Owen, Ann. & Mag. N. H. 1844, xiv. p. 23 (larval form). 
Amblystoma, Chondrotus, Linguelapsus, Cope, Amer. Nat. 1887, p. 88. 
Palatine teeth in a long transverse series, continuous or slightly interrupted in the 
middle; parasphenoid toothless. Tongue free on the sides, slightly free in front, with 
radiating folds. Toes five. ‘Tail more or less compressed. 
This genus, which is well represented in North America, ranges into Mexico. Some 
of the southern forms grow to full size and attain to sexual maturity whilst they retain 
their larval characteristics. These forms are generally known by their Mexican name, 
of Axolotls. Some remain in a larval condition through the whole of their life, others 
complete their metamorphosis whilst still being sexually immature or after having 
reproduced their species. However, the observations made in Europe on specimens 
living in aquaria seem to show that the metamorphosis of Axolotls into perfect 
Amblystoma is exceptional in the artificial conditions under which they were bred. 
1. Amblystoma tigrinum. 
Salamandra tigrina, Green, Journ. Ac. Nat. Sc. Philad. v. p. 116. 
Triton tigrinus, Holbr. N. Amer. Herpet. v. p. 79, t. 26. 
Ambystoma tigrinum, Gray, Batr. Grad. p. 35. 
Amblystoma tigrinum, Bouleng. Batr. Grad. p. 43. 
Ambyostoma californiense, Gray, P. Z. 8. 1853, p. 11, t. 7. 
Ambystoma weismanni, Wiedersheim, Zeitschr. wiss. Zool. xxxii. p. 216, tabb. 11, 12. 
Amblystoma mexicanum (Shaw), Brocchi, Miss. Sc. Mex., Batr. p. 104, t. 17. fig. 1, t. 17 bis. fig. 6. 
(For complete synonymy, see Boulenger, |. c.) 
Hab. Norru AMeRica.—Mezxico, Ciudad in Durango (Forrer), Volcan de Orizaba ( Sad/é), 
Colonia Briguela and La Cumbre de los Arrastrados in Jalisco 8500 feet (Buller). 
Palatine teeth extending from the posterior outer angle of the choana to that on the 
other side, either in a straight line or curving forwards, continuous or slightly inter- 
rupted in the middle. A pair of carpal and tarsal tubercles small, but distinct. 
*38 2 
