CHECKLIST OF THE AMPHIBIA OF MEXICO 7 



Genus BATHYSIREDON Dunn 



Baihysiredon Dunn, Not. Nat., No. 36, 1939, p. 1. 



Genotype. — Siredon du?nerilii Duges. 



Range. — Known only from Lake Pdtzcuaro, Michoacdn, Mexico. 



Species. — One. 



BATHYSIREDON DUMERILH (DugSs) 



Siredon Dumerilii DuGfes,*" La Naturaleza, vol. 1, 1870, pp. 241-244, pi. 5a, figs. 

 1-13.— Taylor, Univ. Kansas Sci. Bull., vol. 26, 1939 (1940), pp. 426-427. 

 Baihysiredon dumerilii Dunn, Not. Nat., No. 36, 1939, p. 1. 



TT/pe.— U.S.N.M. Nos. 16201-16202 (?) (cotypes). 

 Type locality. — Lake Pdtzcuaro, Michoacan, Mexico. 

 Range. — Known only from the type locality, Lake Pdtzcuaro, 2,055 

 m. elevation. 



Genus SIREDON Wagier 



Siredon Wagler, Natiirliches System der Amphibien, 1830, pp. 209-210; Descrip- 



tiones et icones amphibiorum, 1830, pi. 20. 

 Axolotes Owen, Ann. Mag. Nat. Hist., vol. 14, 1844, p. 23 (genotype Axoloiea 



guttata Owen= Gyrinus mexicanus Shaw). 



Genotype. — Siredon axolotl CuYier = Gyrinus mexicanus Shaw. 

 Range. — The ancient lakes of the southern Mexican plateau: Lakes 

 Lerma, Xochimilco, and Chalco. 

 Species. — Two. 



KEY TO SPECIES OP SIREDON 



1. Larvae dark gray with numerous dark or black spots; artificially trans- 

 formed adults blackish with large yellow spots mexicanum (p. 7) 



Larvae uniformly dark blackish or grayish black, lighter below; 

 normally transformed adults grayish or olive-black, lighter be- 

 low lermaensis (p. 8) 



SIREDON MEXICANUM (Shaw) " 



Gyrinus mexicanus Shaw, Nat. Misc., vol. 9, 1789, pis. 343, 344. 



Siredon mexicanum Baird, Journ. Acad. Nat. Sci. Philadelphia, scr. 2, vol. 1, 



1849, p. 292.— Smith, Publ. Field Mus. Nat. Hist., zool. ser., vol. 24, 1939, 



pp. 16-17.— Taylor, Univ. Kansas Sci. Bull., vol. 26, 1939 (1940), pp. 



424-425, pi. 45, fig. 3. 

 Siren piscijormis Shaw, Gen. Zool., vol. 3, pt. 2, 1802, p. 612, pi. 140. 

 Siredon axolotl Wagler, Natiirliches System der Amphibien, 1830, p. 209. 

 Axolotes guttata Owen, Ann. Mag. Nat. Hist., vol. 14, 1844, p. 23 (lake near 



Mexico City; types unknown). 



i« It is presumed that this species has become extinct owing to the introduction of exotic game and food 

 fishes. 



11 Sir. [edon] lich. [enoides] alba Duges (La Naturaleza, vol. 1, 1869, p. 145) is a nomen nudum whose identity 

 should not be guessed. 



