304 U. S. NATIONAL MUSEUM BULLETIN 2 06 



comparison proves that they are not the same, however. L. gaigeae 

 apparently is the link between Zachaenus and Leptodactylus in about 

 the same degree as Zachaenus suggests Ceratophrys and Craspedoglossa. 



Specimens examined 

 BRAZIL: 



Rio de Janeiro: Bonito, Serra da Bocaina, USNM 96759 (type) and 96760 

 (paratype), A. Lutz, Dec. 28, 1931. 



Leptodactylus gracilis (Dum^ril and Bibron) 



Plate 27, Figures a, b 



1841. Cystignathus gracilis Dum^ril and Bibron, p. 406 (type locality, Monte- 

 video, Uruguay). — Bibron, 1847, p. 10, pi. 13, figs. 6-7, — GUntheb, 

 1858, p. 28.— Hensel, 1867, p. 130.— F. MUller, 1882, p. 130. 



1875. Leptodactylus gracilis Espada, p. 44. — Boulenger, 1882a, p. 241; 1884b, 

 p. 389; 1885a, p. 196; 1886a, p. 413; 1886b, p. 441.— Cope, 1887, p. 

 61.— BoETTGER, 1892, p. 30.— Berg, 1896, pp. 150, 183.— Baumann, 

 1912, p. 162.— NiEDEN, 1923, p. 483.— A. Lutz, 1924a, p. 235; 1926b, 

 pp. 146, 165, pi. 32, figs. 4, 5, pi. 33, figs. 3, 6.— Peracca, 1895, p. 27.— 

 Miranda- Ribeiro, 1926, p. 143; 1927, pp. 114, 116.— Bonjour, 1930, 

 p. 385, figs. 1, 5, 8. — MtJLLER and Hellmich, 1936, p. 39. fig. 14. 



Description. — ^Adult female, USNM 96614, Bonito, Serra da 

 Bocaina, Rio de Janeiro. Vomerine teeth in two heavy, transverse, 

 nearly contiguous series between and behind the choanae; maxillary 

 teeth present; tongue two-thirds as wide as mouth opening, heart- 

 shaped, free posteriorly. Snout long, bluntly pointed at the tip 

 when seen from above, in profile with a rim running backwards along 

 upper lip to tympanum ; upper jaw projecting far beyond lower. Nos- 

 trils superolateral, scarcely projecting, their distance from end of snout 

 nearly as great as their distance from eye, separated from each other 

 by an interval equal to their distance from eye. Canthus rostralis 

 rounded but distinct, the loreal region flat, sloping to form an obtuse 

 angle with the upper Up rim. Eye large and prominent, its diameter 

 three-fourths its distance from tip of snout; interorbital diameter 

 about lYi times the width of upper eyelid, equal to distance between 

 nostrils. Tympanum large, distinct, about three-fourths the diameter 

 of eye, separated from eye by an interval equal to one-third its own 

 diameter. Fingers free, with very distinct lateral ridges, second and 

 fourth subequal, reaching to base of penultimate phalanx of third; 

 first very long, reaching to base of last phalanx of third ; a small flat 

 oval tubercle at base of thumb, and a much larger palmar tubercle; 

 subarticular tubercles weU developed. Toes with lateral ridges, not 

 webbed, third a httle longer than fifth, reaching to base of antepenulti- 

 mate phalanx of fourth; a small conical inner and a minute wartlike 

 outer metatarsal tubercle; an indistinct ridge along inner border of 



