FROGS OF SOUTHEASTERN BRAZIL — COCHRAN 123 



Examination of large numbers of this puzzling small species prompts 

 a few general observations: Many of these frogs have the nostrils lo- 

 cated in a projecting bulge, with a furrow between, giving the sinuous 

 outline to the snout, when viewed from above and behind, charac- 

 teristic of Hyla sanhorni Schmidt. 



A pair of elongate air-sacs could be seen in the dorsolateral region on 

 certain specimens. They extended from in front of the shoulder prac- 

 tically to the groin. In some preservations these stain a pinkish or 

 light brown color. 



The bubblelike median vocal sac of the male is large and obvious. 

 It is heavily plicate, and even in young males in which it is not weU 

 developed, the little folds on the sides are visible. While the sac is 

 described as "median" it is almost a semicircle across the throat, as its 

 outer folds begin just below the t3Tnpani. 



The tibia is relatively thick in this species, although not quite so much 

 so as in the rubra group. The femur is uniformly immaculate. The 

 dorsal pattern is subject to great variation, being sometimes a scat- 

 tering of large dots, but often a series of fairly regular, white-outlined 

 spots of characteristic shape. Occasionally it is lacking. 



The snout is usually blunt or rounded; this feature varies a great 

 deal also. 



There is little disparity in the maximum size of the two sexes, the 

 largest Brazilian female being 25.5 mm. in head and body length, and 

 the largest male 26.5 mm. This condition is very unusual among 

 amphibians, where the female is usually larger. 



The males greatly predominate in collections, as much as 24 to 1 in 

 the Bello Horizonte collection. It is uncertain whether they also 

 outnumber the females in nature, or are more apparent because of their 

 calling, or so fearless during breeding time that they can be picked up 

 more easily. 



Many more frogs, and from many more localities than those now at 

 hand, must be studied before the hmits of variation of this species 

 can be accurately ascertained. 



Specimens examined 



BRAZIL: BM RR 1936.12.3.194-5, Lord Stuart; UZMK 61. 



Amazonas: Upper Amazon, BM 91.9.24.43, Bartlett. 



DiSTRicTO Federal: Bom Success©, USNM 96197-8 (cotypes of H. pollens), 

 A. Lutz, Sept. 2, 1923; USNM 96199 (cotype of H. pallens), A. Lutz, Aug. 6, 

 1921 ; USNM 96195-6. Manguinhos, USNM 97359, Venancio, Jan. 28, 1935; 

 USNM 97365-73, Venancio, Feb. 11, 1935. Rio de Janeiro, ZMB 7300 (2; 

 cotypes of H. minuta); MZUM 64148 (7), 63344; USNM 70525-30, Metcalf, 

 Oct. 11-17, 1925. Santa Alexandrina, USNM 96378-9, A. Lutz, Aug. 30, 

 1923. Tijuca, USNM 96257, A. Lutz, Feb. 2, 1920. 



