THE BATRACHIA OF NOETH AMERICA. 435 



RAN A CANTABEIGENSIS Baml. 



Proceed. Ac. Pliila., 1854, p. 62; Boulenger, Bull. .Soc. Zool. France, 

 1880, p. 209 ; do. Cat. Batr. Sal. Brit. Mus., 1882, p. 45. 



Bana sylvatica De Kay, N. Y. Fann, iii, p. 64, PI. 21, 22; Boulenger, Bull. 



Soc. Zool. France, 1879, p. 174. 

 Eana temporaria, var. silvatica pt., Giiutli., Cat. Brit. Mus., 1868, p. 17. 

 Bana iemporaria cantahrigensis Cope, Check-List N. Amer. Batr. Reptil., 1875, p. 32. 



This species differs more widely from the B. temporaria thau does th© 

 B. pretiosa, so much so, that I now follow Professor Baird and Mr. Bou- 

 lenger in maintaining it as a distinct species. As usual with the species 

 of their genus, it presents such variations as to render the common 

 origin of all these forms certain. Thus in four specimens from Lake 

 Alloknagik, Alaska, the web of the hind foot is as fully developed in 

 the B. temporaria pretiosa, only two phalanges of the fourth toe being 

 free. Associated with them was a specimen of the variety B. can- 

 tahrigensis evittata. In the specimen (Ko. 5169) from Puget Sound, 

 Washington, the posterior leg is remarkably elongate, reaching the 

 end of the muzzle, so as to approach nearly to the B. silvatica. 



Two distinct subspecies and a variety of the Bana cantahrigensis are 

 known to me, which differ as follows: 



Only two phalanges free ; no longitudinal stripes on back or tibia B. c. latiremis. 



Three phalanges free ; no longitudinal strips on back or on tibia B. c. evittata. 



Three phalanges free ; a median dorsal and an anterior tibial light stripe 



B. c. cantahridgensis.. 



Bana cantahrigensis latiremis Cope. 



Proceedings American Philos. Society, 1886, j). 520. 



Muzzle rather obtuse, more so than in the typical B. cantahridgensis^ 

 and widened posteriorly; its length at the posterior edges of the tym- 

 pana entering the length of the head and body three and a half times. 

 The tympanic drum is very distinct, and its long diameter enters that 

 of the eye two-thirds of a time. The nostrils are equidistant between 

 the orbit and the end of the muzzle, and look upwards. The skin is 

 quite smooth everywhere, with a dosolateral fold which is easily obliter- 

 ated by immersion in alcohol. The heel of the extended hind leg reaches 

 to the middle of the eye; the second toe reaches nearly to the apex of 

 the knee. The palmation is remarkably wide, leaving but one free 

 phalange on all the digits except the fourth, where two are free. The 

 internal cuneiform tubercle is quite prominent, with an obtuse convex 

 edge. There is no external tubercle. The internal finger (index) is 

 short and stout, and is very little or not at all longer than the second 

 (third) finger. 



Color above, light brownish-gray ; below, white. There are more or 

 less numerous black spots on the sides, which incline to fuse more or 

 less imperfectly into a longitudinal band along the dorsolateral dermal 



