AMERICAN FROGS OF THE GENUS RANA. 449 



(1906); Camp, Univ. Calif. Publ. Zool., XVII, 1917, p. 123; Bouleng., Ann. 

 and Mag. N. H. (9) III, 1919, p. 410. 



Rana temporaria aurora Cope, Proc. Ac. Philad., 1883, pp. 27, 28. 



Rana agilis aurora Cope, Proc. Am. Philos. Soc. XXIII, 1886, p. 521, and 

 Batr. N. Am., p. 441, figs. (1889); Meek, Field Col. Mus., Zool. I, 1899, p. 332. 



Vomerine teeth in oblique groups close together just behind the 

 level of the choanse. 



Head as long as broad or slightly broader than long, much depressed ; 

 snout rounded, feebly projecting beyond the mouth, as long as or 

 slightly longer than the eye; canthus rostralis obtuse; loreal region 

 very obHque, scarcely concave ; nostril a little nearer the eye than the 

 tip of the snout; distance between the nostrils greater than the inter- 

 orbital width, which is | to f that of the upper eyelid; tympanum very 

 distinct, about f the diameter of the eye, 1^ to 2 times its distance 

 from the latter. 



Fingers rather long, obtuse, first as long as or a little longer than the 

 second, third much longer than the snout; subarticular tubercles 

 moderate. 



Hind limb long, the tibio-tarsal articulation reaching the nostril, 

 the tip of the snout, or a little beyond, the' heels overlapping where 

 the limbs are folded at right angles to the body; tibia 4 to 4| times 

 as long as broad, if to l^- times in length from snout to vent, shorter 

 than the fore limb, a little shorter than the foot. Toes obtuse, f 

 webbed, two phalanges of fourth free, outer metatarsals separated 

 nearly to the base; subarticular tubercles small or rather small, 

 moderately prominent; no distinct tarsal fold; inner metatarsal 

 tubercle oval, prominent, | to | the length of the inner toe; a more or 

 less distinct outer tubercle. 



Upper parts smooth; a rather broad, more or less prominent glandu- 

 lar dorso-Iateral fold from above the tympanum to the hip or not 

 quite so far, parallel with its fellow, from which it is separated by a 

 space 6 times in the length from snout to vent; a glandular fold from 

 below the eye to above the arm, followed by a glandule. Lower 

 parts smooth, hinder half of thighs, and sometimes posterior part of 

 belly, granulate. 



The specimens in the British Museum, for which I am indebted to 

 the kindness of Miss Dickerson, are brown above with small dark 

 spots, a dark temporal blotch, a light streak from below the eye to the 

 shoulder, and dark cross-bands on the limbs, in fact very similar 

 to ordinary specimens of R. temporaria except for the absence of 

 the A-shaped marking between the shoulders. According to Miss 



