The Batrachia of North America

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2534, from the Platte Eiver, Nebraska. The supratympanic crest is represented by an angle of the postorbital in the great majority of spec- imens, but in seventeen specimens the former is quite as distinct as in numerous specimens of the B. I. lentirjinosm. These belong to Nos. 24S1.
2493, 2472, 2474, 2497, 2557, 5372, and 1006G. Nevertheless, it is true that the subspecies B. I. amcricanus maintains its characters entirely witliin the range of the />. I. leritigiiiosm, as is evidenced by speci
...mens from Prairie Mer Rouge, La. (2557), Milledgeville, Ga. (9430), Monti- cello, Miss., and elsewhere.
As already described, the parotoid glands of this species are long and rather narrow. A vaiietal form has them wider and reniform in out- line. The live individuals which display this character are from north- 286 BULLETIN 34, UNITED STATES NATIONAL MUSEUM.
eru localities, viz : No. 2505 from Racine, Wis., and 2507 from Essex Coanty, N. Y. They are also characterized by the presence of a supra- tympanic crest and by the coarseness of their tuberculation.


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