446 



BOULENGER. 



dorso-lateral extending from above the tympanum to the hip, the 

 median pair extending from behind the eyes to the sacral region, 

 where they are replaced by another pair closer together; the distance 

 between the dorso-lateral folds 4 to 6 times in length from snout to 

 A-ent; a few flat glands sometimes present, in addition to the folds 

 ■on the back; a glandular fold from below the eye to above the arm. 

 Lower parts smooth. 



Brown above, the dorso-lateral folds usually not much lighter, 

 bronzy; a dark brown or blackish spot on the snout and another 

 on each upper eyelid; two series of very large, often squarish, dark 

 brown or black spots along the back, some of them sometimes longi- 

 tudinally or transversely confluent; sides with one or two series of 

 black spots, or with black vertical base ; a dark ventral streak ; a light 

 streak on the glandular fold below the eye, rarely extending to the tip 

 of the snout; tympanum reddish or bronzy; limbs with very regular 

 dark brown or black cross-bands; hinder side of thighs yellow or 

 orange, with black spots or marblings. Lower parts white, rarely 

 with pale brown spots, posterior part of belly and hind limbs yellow 

 or orange. 



Male with internal vocal sacs; fore limbs very strong, with a large 

 pad on the inner side of the first finger. 



Osteological characters as in R. halccma. 



Tadpole also not essentially different. 



Eggs very small, little over 1 millimeter in diameter. 



Habitat. — North America east of the Mississippi. 



R. palustris is very closely allied to R. halecina, and although its 

 specific rank is unquestionable, it is by no means easy to point out 

 constant characters for its distinction. 



10. Rana draytonii. 



Rana draytonii Baird and Gir., Proc. Ac. Philad., 1852, p. 174, and U. S. 

 Explor. Exped., Herp., p. 23, PI. ii, figs. 19-24 (1858); Cope, Proc. Am. 

 PhUos. Soc, XXIII, 1886, p. 521, and Batr. N. Am., p. 441, figs. (1889); 

 Stejneg., N. x\m. Faun., No. 7, Pt. ii, p. 225 (1893); Van Denburgh, Proc. 

 Calif. Ac. (2) V, 1896, p. 1008; Dickerson, Frog Book, p. 213, Pis. xv, lxxx, 

 Lxxxi (1906); BouLENG., Ann. and Mag. N. H. (9) III, 1919, p. 410. 



Rana lecontei Baird and Gir., Proc. Ac. Philad., 1853, p. 301. 



Rananigricans (non Ag.), Hallow., Proc. Ac. Philad., 1854, p. 96; Bouleng., 

 Bull. Soc. Zool. France, 1880, p. 207; Brocchi, Miss. Sc. Mex., Batr., p. 15, 

 PI. IV, fig. 3 (1881); Bouleng., Cat. Batr. Ecaud., p. 43 (1882). 



