306 U. S. NATIONAL MUSEUM BULLETIN 206 



feature, and the snout itself is narrower in this species, although many 

 individuals of sibilatrix have quite narrow snouts. Perhaps the most 

 distinctive feature is the coloration of the posterior femur, which is 

 mottled towards the upper surface, but below has a white longitudinal 

 stripe bordered by more or less irregular black stripes extending for 

 nearly the entire length of the femur in sibilatrix, while in gracilis 

 the mottling is much more general, the v/hite and black stripes being 

 broken up, shorter, and sometimes scarcely evident at all. The dorsal 

 dark spots are much larger in sibilatrix than in gracilis, and the median 

 dorsal stripe, when present in sibilatrix, is wider. 



More collecting in southern Brazil and in northern Uruguay may 

 eventually produce series of frogs that will completely bridge the 

 differences between these forms. 



At Alto da Serra, Sao Paulo, L. gracilis was found in campos, or 

 fields, in the valleys at the foot of the Serra, not on the peaks. The 

 call is like that of a cricket, high and often repeated, tit-tit-tit-tit-tit. 

 Eggs have not been observed in this region, but the tadpoles and young 

 are frequently found in cow tracks, two or three perhaps in each one, 

 or in other small holes in breijos (marshes). The species is too small 

 to be eaten by the natives. 



Specimens examined 

 BRAZIL: 



MiNAS Gerais: Ouro Pr^to, USNM 98028-44, Cochran and Venancio, Mar. 



19, 1935. 

 Rio de Janeiro: Benito, Serra da Bocaina, USNM 96614-6, 96728-36, A. 



Lutz. Serra da Bocaina, USNM 81133-4, A. Lutz, Jan. 19, 1930. 

 Rio Grande do Sul: P6rto Alegre, KZAEM 2521, Emrich, 1933; ZMB 31094, 



Adloflf. Santa Maria, IB 614-5. 

 Santa Catarina: Sao Bento, ZSBS 100/1925, A. Lutz; USNM 97174-5, Behr, 



1915. 

 Sao Paulo: Alto da Serra, USNM 96813-4, A. Lutz; MRHN IG 9308 Reg. 



55, Massart, Oct. 1922. Capital, IB 178. Terceira Repressa, ZSBS (1), 



Schindler, Dec. 26-31, 1937. 

 URUGUAY: Montevideo, MHNP 189, d'Orbigny. 



Leptodactylus tnarmoratus (Steindachner) 



Plate 27, Figures c-f 



1867. Adenomera marmorata Steindachner, p. 37, pi. 3, figs. 5-8 (type locality, 



Brazil) . 

 1885. Leptodactylus diptyx Boettger, p. 244 (type locality, Paraguay). — ■ 



BouLENGER, 1886a, p. 413. — Nieden, 1923, p. 484. — Miranda-Ribeiro, 



1926, p. 148.— A. Lutz, 1930, pp. 10, 29.— Parker, 1931, p. 286.— 



Mello-Leitao, 1937, p. 315. 

 1895. Leptodactylus diptix Peracca, p. 28. 



