THE BATRACHIA OF NORTH AMERICA. 



103 



The total length of largest specimen seen (39J9, Saint Louis) is 6 

 iuebes, of which the tail forms 2.60. The smallest adult is 2 inches 

 long. 



In the just perfected young is seen a series of illy-defined light spots, 

 larger than elsewhere along each side of the back. The belly is quite 

 light colored. 



This species bears a close resemblance to Plethodon gUitinosus, from 

 which the generic peculiarities, the longer digits, etc., readily distinguish 

 it. The bluish spots, too, are much less sharply defined and duller, less 

 silvery, and do not occur on the back to anything like the same extent 

 as in P. glutinosus. From A. jeffersonianum it will be known by the 

 projecting lower jaw, much smaller and more arched head, greater 

 number of costal furrows, more evident spots on the sides, etc., besides 

 the important peculiarities of tongue and teeth. 



This is one of the species whose metamorphosis is completed some- 

 time before it attains full size. A specimen in which minute stumi)s of 

 the branchias remain measures 2 inches in length; another without 

 traces of them, 2.15 inches. The width of the head enters the length to 

 the groin 4.2 times, and the tail falls short of the axilla from its base. 

 These measurements may be compared with those of the adult in illus- 

 tration of the general principle that the relative lengths of body and 

 tail increase with increased size. 



The well- developed lateral i^rocesses of the otoglossal cartilage ap- 

 proach the character of Amblystoma more than is seen in any other 

 species of Choudrotus. Its very long median processes are not found 

 in any other species of this genus. Although they lie closely appressed 

 in the long axis of the tongue, they are homologous, each with a half 

 of the circle of Amblystoma. 



Chondrotus microstomus Cope. 

 RESERVE SERIES. 



Catalogue 

 number. 



8875 

 8837 

 .3999 

 5982 

 3884 



3902 

 4037 

 11056 

 11878 

 3995 

 3949 

 11050 

 8906 

 12058 

 8777 

 1384G 

 11564 

 14472 

 14474 

 4096 

 4001 

 4G87 



ISTo. Of 

 spec. 



Locality. 



Mandeville, La 



Mount Cainiel, III 



S.'iint Louis, Mo 



(?) 



Prairie Mei* Rouge, 

 La. 



New Madrid, Mo 



Fort Smith, Ark 



Mount C arm el. Ill 



W lieatland, Ind , 



Columbus, Oliio 



New Madrid, Mo 



Mount Carmel, 111 



Oakley.S.G 



Mount Carmel, 111 



Belleville, 111 



Hudson's Bay 



(?) '- 



(?) 



Saint Louis, Mo 



Southern Illinois 



Lancaster, Ohio 



Grand Cotcau, La 



When 

 collected. 



Nov. —,1876 

 June—, 1875 



Nov. — , 1881 

 Apr. — , 1881 



Nov. -,1881 

 Apr. 5,1887 



From whom loceivcd. 



N. O. Academy 



Samuel Turner 



Dr. Geo. Englemann. 



Jas. Fairie 



R. Kennicott 



Dr. B. F. Shumard . . . 



L. M. Turner 



Robert Ridgway 



Prof. L. Lesquereux . 



R. Kennicott 



L. M. Turner 



F.W. Hay ward 



L. M. Turner 



Dr. A. Rouss 



F. W. Hayden 



(?) 



W.H. Tel. Ex 



Dr. Geo. Engelmann . 



R. Kennicott 



L. Lrsqiuproux: 



St. Charles Collciie . . 



Nature of speci- 

 men. 



Alcoholic. 

 Do. 

 Do. 

 Do. 

 Do. 



Do. 



Do. 



Do. 



Do. 

 Two larvas. 

 Pulli. 

 Alcoholic. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. . 



Do. 



Do. 



Do. 



