65 



No dorso-dermal folds ; tympanum usually as large as eye, or larger;, 

 toes webl)ed to tips ; usually some blotches above ; size large. 



catesbiana, ji. 70. 

 B. Side of head with a black patch. 



Head in distance from snout to vent 3.5 times; tympanum one-half 

 the eye ; skin of middle of back smooth ; heel to middle of orbit. 



canfabrigevsis. Appendix. 

 Head in length 3 times; tympanum two-thirds the diameter of eye; 

 skin of middle of back rough ; heel to muzzle or more. 



sylvatiea, p. 71, 



Sana pipiens, Gmel. 

 Leopard Frog. 



Rana pipiens, Gmelin, 1788, 123, 1052 ; Rmia virescens, Cope, 1889^ 

 31, 397, with figures ; Rana halecina, Schreber, 1782, 66, 185 ; Holbrook,,. 

 1842, o4, iv, 91, pi. 22; Boulenger, 1882, 27, 41. 



A very common, widely distributed and variable frog. Head varying 

 in relativ^e length, being contained in the length of head and body froni 

 2.5 to 3.5 times. Vomerine teeth in two slightly oblique patches betweeru 

 the choanre. Tympanum about as large as the eye. Heel reaching to 

 the muzzle or a little beyond. A pair of prominent dorso-lateral folds 

 starting behind the eyes and running to the end of the body. Between 

 these may be two or more thinner folds. None of these folds are as broad 

 as those of R. palustris. Another glandular fold runs from the corner of 

 the mouth to the shoulder. No, or an inconspicuous, branch meeting 

 this from the dorsal-lateral fold behind the tympanum. 



Ground color ashy, olive or bright green above ; below uniform white 

 or yellowish. The upper surface with a number of rounded or oval brown 

 spots of small to medium size, and these usually bordered with yellowish. 

 The spots between the dorsolateral folds are larger, and may be arranged 

 in two or three rows, or may be irregularly placed. Outside these fold* 

 are two or three rows of smaller spots. The upper surfaces of the limba 

 are more or less conspicuously barred or spotted. Length of head and. 

 body of full grown specimens three to four inches. 



Most of the males of this species have vocal sacs, which open by at 

 small slit near the angle of the mouth. These sacs appear to be pro- 

 truded through the slits, and serve to render the voice more powerfuL 

 Of this species Prof. Cope recognizes four subspecies, three of which may 

 occur in our region. It must, however, be u"nderstood that forms inter- 

 mediate are likely to be found. 



Head long, contained in the length to vent 2.5 to 3 times; snout 

 long and pointed ; males with external vocal vesicles ; heel reaching be- 

 yond tip of snout ; web of foot leaving three phalanges of fourth toe 



