292 BAIRD'S REVISION OF THE 



Siredon axolotl, (1833) Wagler. Icones Amph. PI. 20. 

 Axoloil (1811) Cuv. Kept. dout. in Humb. Obs. Zool. 104, PI. 14. 

 Hypocthon pisciformis, (1829) Gravenhorst. Del. Mus. Vratislav. p. 89. 

 Acholotes guttalus, (July 1844) R. Owen. Ann. and Mag. Nat. Hist. XIV. p. 23. 

 Hab, Lakes near City of Mexico, Baird. 



S. MACULATUS, Bd. 1844. 



Acholotes m., (July 1844) R. Owen. Ann. and Mag. Nat. Hist. 14, p. 23. 



Hab. Rio Grande, Owen. 



It is only because there is no positive proof to the contrary, that I retain the genus 

 Siredon as real, placing it at the bottom of the series. It so much resembles the 

 larva of Amhystoma punctata, in both external form and internal structure, that I 

 cannot but believe it to be the larva of some gigantic species of this genus. It differs 

 from all known perennibranchiates in possessing the larval character of the gular or 

 opercular flap, this being unattached to the subjacent integument and free to the 

 extremity of the chin. The non-discovery of the adult is no argument against its 

 existence; I had caught hundreds of the very remaikable larva of Pseudotriton 

 salmoneus near Carlisle before I found an adult. Until then I kn^w not where to 

 refer the animal, supposing this species to exist no nearer to me than the mountains 

 of northern New York and Vermont. 



Descriptions of four new species of North American Salamanders, and one new species 



of Scink. 



Ambystoma macrodactyla, Baird. Scull longer than broad. Toes long, 

 un webbed. A broad dorsal reddish brown stripe. Beneath dark brown, unspotted. 



Specimens in the Academy of Natural Sciences of Philadelphia. Brought from 

 Astoria, Oregon, by J. K. Townsend, M. D. 



Body rather more slender than in the other species o^ Ambystoma ; the proportions 

 nearly those of Desmognathus fiiscus, (Raf.) The colors somewhat like those of a 

 badly preserved Pkthodon erythronotns, (Green.) Ground color dark brown. A 

 broad dorsal stripe, originally, it is probable, of a chestnut brown color, now very 

 obscure. Sides sprinkled with greyish. The brown of the sides becomes more 

 concentrated towards the vertebral line. Tail sub-round, not compressed. Largest 

 specimen about 2 1 inches. From the snout to the insertion of the hind legs 1| 

 inches. 



Ambystoma mavortia, Baird. Scull broader than long. Toes short and broad. 



