AMERICAN FROGS OF THE GENUS RANA. 423 



3. Rana septentrionalis. 



Rana septentrionalis Baird, Proc. Ac. Philad., 1855, p. 51 and Rep. U. S. 

 Expl. Surv., XII, ii, PI. xxix, fig. 2 (1860); Yarrow, Rep. Explor. Surv. 

 w. of 100th Mer., Batr. Rept., p. 528 (1875); Bouleng., T^at. Batr. Ecaud., 

 p. 37 (1882) and Ann. and Mag. N. H. (5) XI, 1883, p. 16; Garnier, Amer. 

 Nat., XVII, 1883, p. 945; Cope, Batr. N. Am., p. 416, PL lxxxvi (1889); 

 Werner, Jahrnb. Nat. Ver. Magdeb., 1894, p. 135; Dickerson, Frog Book, 

 p. 224 (1906); Bouleng., Ann. and Mag. N. H. (9), III, 1919, p. 409. 



Rana sinuata Baird, 1. c. 



Vomerine teeth in small groups close together, on a level with the 

 posterior border of the choanse or just behind the latter. 



Head a little broader than long, much depressed; snout rounded, 

 scarcely projecting beyond the mouth, as long as or slightly longer 

 than the eye; canthus rostralis very indistinct; loreal region very 

 oblique, slightly concave; nostril equidistant from the eye and from 

 the tip of the snout, or a little nearer the former; distance between the 

 nostrils greater than the interorbital width, which is about | that of 

 the upper eyelid; tympanum very distinct, f to t the diameter of the 

 eye in females, as large as or larger than the eye in males, close to the 

 eye or narrowly separated from it. 



Fingers pointed, first and second equal, third much longer than the 

 snout; subarticular tubercles small, moderately or feebly prominent. 



Hind limb moderately long, the tibio-tarsal articulation reaching 

 the eye, the heels meeting or slightly overlapping when the limbs are 

 folded at right angles to the body; tibia 3 to 4 times as long as broad, 

 2 to 2| times in length from snout to vent, shorter than the fore limb 

 or than the foot. Toes rather pointed, broadly webbed, the web 

 reaching the tips of the third and fifth but leaving one or two phalanges 

 of the fourth free; outer metatarsals separated nearly to the base; 

 subarticular tubercles small, moderately or feebly prominent; tarsal 

 fold absent or merely indicated; inner metatarsal tubercle elliptical, 

 feebly prominent, -g- to f the length of the inner toe; no outer tubercle. 



Skin smooth; glandular dorso-lateral fold, from above the tym- 

 panum, absent or flat and very indistinct, and not extending posteriorly 

 beyond the sacral region; a fold from the eye to the shoulder. 



Brownish olive or purplish brown above, spotted or marbled with 

 black, or blackish with sinuous whitish lines or with light vermicula- 

 tions; limbs without angular cross-bands; hinder side of thighs 

 marbled black and white. Lower parts white, throat yellowish. 



