AMEKICAN FROGS OF THE GENUS RANA. 421 



The tadpole is also very similar to that of R. esculenta and reaches 

 the size of that of Pelobates fuscus. Mouth small; back narrowly 

 edged with black; having white in a long marginal upper series with a 

 very short one (rarely 2) on each side and 3 lower series, the inner- 

 most narrowly interrupted in the middle. Upper parts often dotted 

 with black. 



The eggs are very small, as in R. esculenta. 



Habitat. — North America east of the Rocky Mountains, from 

 Canada (Quebec, Ontario) to Florida and Texas. 



Measurements on p. 420. 



2. Rana grylio. 



Rana catesbiana, part., Cope, Batr. N. Am., p. 424 (1889). 



Rana grylio Stejneg., Proc. U. S. Nat. Mus., XXIV, 1901, p. 212; Dickkr- 

 soN, Frog Book, p. 226, Pis. lxxxv, lxxxvi (1906); Bouleng., Ann. and Mag. 

 N. H. (9) III, 1919, p. 409. 



Vomerine teeth in small groups close together between the choanse. 



Head nearly as long as broad or a little broader than long, much 

 depressed; snout rounded or obtusely pointed, feebly projecting 

 beyond the mouth; can thus rostralis very indistinct; loreal region 

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

 tip of the snout or a little nearer the latter; distance between the nos- 

 trils greater than the interorbital width, which equals f to i that of 

 the upper eyelid; tympanum very distinct, as large as the eye in 

 females, 1^ to nearly twice its diameter in males, close to the eye in 

 males, 3 times its distance from the eye in females. 



Fingers rather long, pointed, first a little shorter than the second, 

 third longer than the snout, second and third with a more or less 

 distinct dermal margin; subarticular tubercles small, feebly prominent. 



Hind limb moderately long, the tibiotarsal articulation reaching the 

 tympanum or the eye, the heels meeting or narrowly separated when 

 the limbs are folded at right angles to the body; tibia 3 to 3| 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 long, obtuse, third longer 

 in proportion to the fourth than in R. cateshiana,^ all webbed to the very 

 tips; outer metatarsals separated nearly to the base; subarticular 



3 Third meaning, according to Stejneger, 80 to 84 per cent of fourth, as 

 against 70 to 76 (both measured from the anterior edge of the metatarsal 

 tubercle). 



