84 



BULLETIN 34, UNITED iSTATEti NATIONAL MUSE:IM. 



Professor Baird first reached the couclusiou that the early stage of 

 this si)ecies is a Siredou, and he suspected ou that account that the 

 Siredon mexicanus of the valley of Mexico is the larva of an unknown 

 species of Aiublystonia. Long aftervvards Prof. Auguste Duiueril 

 received some larvte of the A. tigrinum from Mexico and observed their 

 metamorphoses in the reptile-house of the Jardin des Plantes of Paris. 

 He supposed the species to be the Siredon mexicanum^ but I showed 

 that it was the Amblystoma tujrinum {'■'' mavortium''^), after an examina- 

 tion of specimens sent by him to me to Philadelphia.* Since then 

 Professor Marsh at New Haven, and Madame Chauvin in Switzerland, 

 have observed the metam3rpliosis of the same species. Professor Du- 

 meril also showed that it can reproduce while still branchiferous. 



Siredon mexicanum Wagl. {Amblystoma mexicanum Cope) inhabits 

 Lakes Chalco and Xochimilco, in the valley of Mexico. Its metamor- 

 phosiM has never been observed, but it is asserted by I. M. Velasco to 

 take place. It is readily distinguished from the larva of the Ambly- 

 stoma tigrinum by its color. It is of a pinkish gray, and is covered 

 with numerous small round, dusky spots, rather closely placed. While 

 nearly related to the larva of the A. tigrinum^ it is clearly a difleVent 

 form. Should it prove to be the case that it does not undergo a meta- 

 morphosis, the genus Siredou, of which it is the type,, must be retained. 

 A second species, the S. dumerili, has been described by Duges from 

 Lake Patzcuaor in the State of Guanajuato. Its color is uniform. 



Amhliistoma tigrinum Grceu. 

 RESERVE SERIES. 



Catalogue 



No. of 



Bumbcr. 



spec. 



3979 



1 



9273 



1 



10889 



1 



4097 



8 



4691 



10 



9188 



2 



10082 



1 



9929 



1 



4059 



1 



395') 



1 



4908 



1 



3993 



1 



3966 



2 



4097 



3 



3895 



I 



4040 



2 



4691 



6 



4003 



6 



3974 



5 



3990 



1 



9185 



6 



8456 



1 



8294 



5 



8155 



1 



7839 



1 



9180 



1 



3955 



1 



407,9 



1 



4082 



3 



Locality. 



When 

 collected. 



Detroit, Mich 



Virgiuia '. 



Webster City, Iowa . 

 Northern Illinois . . . 

 West Northlield, 111. 



Chicago, 111 



EflgelieUl, S. C 



Webster City, Iowa . 

 Fort Kipley, Minn... 



Now Torli 



Independence, Mo . . . 



Russellville, Ky 



Mississippi 



Northern Illinois 



Saint Louis, Mo 



Lake Encinito, Chi- 

 huahua. 

 West Noithfield, 111. 



Racine, Wis 



Colmiibus, Ohio 



Now Mexico ... 



Foit Union, N. Mex . 

 Nutrias, N. Mex ... 

 Bonito Canon, Ariz. . 



Arizona 



Fort Reynolds 



Fort Bliss, N. Mex 

 Fort Benton, Mo . . 

 Tamaulipas, Mex.. 



Sept. — , 1874 

 May 21, 1878 



Sept. 7,1877 

 Apr. — , 1879 



— , 1874 



From whom received. 



A. Sager 



Chas. Aldiieh. 



R. Keunicott 



do 



Sweeny 



S. H. Loud 



Chas. Aldi'ich 



Dr. J. F. Head, U.S.A.... 



Dr. J. G. Coo])er 



Dr. Thos. H. Webb 

 Dr. B. F. Shumard . 

 R. Konnicott 



J. Potts. 



R. Kennicott 



Prof. S.F. Baird 



Prof. L. L(S(inereux 



Dr. J . L. Lo Coute 



Peter Conuell 



Dr. C. G. NTewboriy 



General W. E. M. Arny. . .. 



J. M. Rutter 



A. Clonjrh 



Lieiir. W. L. Carpentei', U. 



S. A. 

 Dr. S. W. Crawford, U. S. A. 



Dr. F. V. Hayden 



Dr. L. A. Edwards, U. S. A. 



Nature of spoci- 

 lueu. 



Alcoholic type. 

 Alcoholic. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Alcoholic type. 

 Alcoholic. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Do. 

 Do. 



Froceediugs Pliiliitlelpliia Acadcuiy, 1858, 



