290 TJ. S. NATIONAL MUSEUM BULLETIN 206 



the sides of fingers and toes, in the majority of cases this fringe is rep- 

 resented by only a dermal ridge, although it is distinctly developed 

 in some examples. The belly and throat of most of the specimens are 

 heavily reticulated, the dark pigment seeming to concentrate in a dark 

 irregular patch on the center of the throat. In the specimens in which 

 the reticulation of the under surfaces is absent, a dark longitudinal 

 spot still persists on the throat. The scattered white warts on the 

 sides are present in all the specimens, but in only a little more than 

 half is there a slight indication of their being arranged in a lateral line 

 in front of the groin. The back is usually free from warts, and the 

 skin is fairly smooth, although thick and glandular. In this respect 

 the Rio de Janeiro frogs differ from the species called E. aspera by 

 MiiUer, which apparently has a much rougher skin, especially on the 

 anterior dorsal region. 



A striking dissimilarity in the toe length of the same individual is 

 noticeable in USNM 96349. In this frog the fourth toe on the left 

 foot measures 19 mm. from base of metatarsal tubercle, while that of 

 the right foot is only 17 mm. long, there being no apparent malforma- 

 tion to account for the difference. The shortening has taken place in 

 the last and penultimate phalanges only. The other toes are the same 

 length on both feet. (I have used the greatest foot length whenever 

 there was a dissimilarity.) 



Remarks. — The tadpole and two metamorphic frogs from Tijuca 

 which served as the basis for A. Lutz's remarks and figures for the sup- 

 posed young of Basanitia lactea prove to be young Elosia nasus, since 

 the disks of the first finger and first toe are plainly divided on top in 

 the two examples which have developing legs. The specimens are en- 

 tirely bleached, so that no pattern appears. These two metamorphic 

 frogs measiu-e 22 and 24 mm., respectively, from tip of snout to anus, 

 while a tadpole of nasus from Corcovado with well-developed hind legs, 

 and forelegs ready to break through the skin of the breast, measures 

 23 mm. The difference in size is negligible. 



Specimens examined 



BRAZIL: MHNP 779, 4895, Gaudichaud. 



Amazonas: TeB6, ZSBS 1044/0 (2), Spix. 



Bahia: ZSBS 1043/0 (2; cotypes of Hyla ranoides (?)), Spix. 



DisTRicTO Federal: Corcovado, USNM 96329-31, A. Lutz, 1921-2. 

 Paineiras, slope of Corcovado, USNM 96346, A. Lutz, Nov. 13, 1923. 

 Rio de Janeiro, USNM 81150-2, 96349-50, 96371-3, A. Lutz; USNM 67445-6, 

 U. S. Exploring Expedition, 1852; ZSBS (12), A. Lutz, 1924. Tijuca, 

 USNM 96258-61, A. Lutz and Venancio, Mar. 5, 1934; USNM 96271 (3 

 tadpoles), A. Lutz, December 1922; MZUM 104242, Bailey, 1941. 



Rio de Janeiro: Barro Branco, MZUM 104244, Bailey, 1941. Teres6polis, 

 MHNP 07-226-7, Steindachner. 



