THE BATRACHIA OF NORTH AMERICA. 367 



Body slenderest of all the North Americau species ; limbs elongated. 

 Outline of head acute, angled, slightly curved on sides, rather longer 

 than broad. Snout rather pointed; sides of the snout somewhat ob- 

 lique; length of head entering total a little over three times. Tym- 

 panum small, about half the diameter of the eye, a fold of skin above it. 

 Tongue rather ovate, slightly notched behind, where it is free for one- 

 third its length. Vomerine protuberances small, rounded, their axis 

 slightly inclined, almost exactly between the posterior nares; sepa- 

 rated from each other and the nares by the same interval. The ranges 

 of teeth are a little behind, about on a line with the posterior margins 

 of the nares. 



The extremities are rather slender and elongated. The heel of the 

 extended hind legs marks the end of the muzzle. Tibia about half 

 length of body; hind foot as long as arm from elbow; two and a half 

 times in total length. The fingers are dilated at the tip into disks, two- 

 thirds as large as the tymj)anum, and webbed at the base to the 

 antepenultimate articulation of the longest. The third is longest, the 

 fourth little shorter ; then the second and first. The hind feet are webbed 

 to the disks (the penultimate articulation in the fourth and longest toe), 

 the web wanting on the inner side of the penultimate joint of the second 

 and third. The third toe is a little longer than the fifth. There is a soft 

 tubercle at base of inner toe and a very rudimentary one at base of 

 outer. 



The skin above and on upper part of sides is smooth, without any 

 pustules; in larger specimen a faint and softened granulation; the belly 

 and inferior face of thighs strongly granulated ; the throat moderately 

 so ; smooth between the arms. 



Color of body and legs above and sides olivaceous-brown or olive- 

 green, with a few scattered, well-defined spots of white. Beneath white, 

 no mottling anywhere. A well-defined line of white starts on the 

 snout, generally united with its fellow on the opposite side, and passes 

 backwards, parallel with the edge of the upper jaw, under the tym- 

 panum and over the arm-pit; extends half-way or more along the sides. 

 It has as a border a deeper shade of the dorsal color. A similar line ex- 

 tends along the posterior margin of the fore legs, most conspicuous 

 at the elbow, and reaches to the outer finger. On the hind leg a simi- 

 lar line passes from the knee, and extends along the posterior or superior 

 margin of the tibia along the exterior edge of the tarsus and foot to 

 the tip, and a second line is seen in some on the anterior margin of the 

 tibia; a short transverse white line above the anus. According to Dr. 

 Holbrook, this species in life is bright grass-green above, the light lines 

 straw color. 



Specimens from west of the Mississippi vary in appearing a little more 

 granulated above. Some males exhibit a more or less tinge of green 

 on the sides of the chin. Sometimes the lateral white line is inter- 

 rupted, and those on the sides of the legs more or less obsolete. 



