FROGS OF SOUTHEASTERN BRAZIL — COCHRAN 167 



75, and find it without doubt an immature H. alhomarginata. The 

 cutaneous glands on heel, above anus, and on anterior dorsolateral 

 region stand out with the distinctness characterizing this species, 

 while every detail of head and limb structure of massarti can be 

 matched in other immature alhomarginata either from Manguinhos or 

 neighboring localities. 



The voice of this frog when it begins to sing is a tang, tang, followed 

 by a continuous ccrrrr as if someone were filing iron. 



The male has an internal gular vocal sac, which is quite large and 

 covered by a citrine membrane. There is a rudiment of a pollex on 

 the inner margin of the hand of the male, but it is not a sharp spur as 

 in the larger species. 



The iris is of a metallic silver hue all over. This color distinguishes 

 the species from all other green Hylas even during metamorphosis. 

 When the frog is asleep, the pupil shows as a dark slit in the silver 

 plate of the iris. Another distinguishing color character of this species 

 is the brilliant orange seen on the flanks and on the webs of hand and 

 foot. These two features render the species quite unmistakable in 

 life. 



Hyla alhomarginata may climb to the tops of trees, but during the 

 breeding season it seeks water in ditches and ponds, sitting on aquatic 

 plants. It is nocturnal and appears to sleep deeply in the daytime. 



It is a rather large species, although the total length of 60 mm. 

 indicated by Nieden seems exceptional. It always appears thin on 

 account of its very slender extremities. In a sitting position its back 

 is very flat. 



The tadpole is large and dark, and is found in still water. 



Specimens examined 



BRAZIL: USNM 12775, Beddome; ZMB 24190, 16-5356, 16-3104-7; UZMK 17; 

 BM 52.12.11.9; NHMW (3; cotypes of Phyllobius exanthematicus) , Frauen- 

 feld, 1857-9 (cruise of the Novara); NHMW (7), Zelebos, 1857-9 (cruise of 

 the Novara); MRHN IG 4802 Reg. 346 (3). 



Amazonas: Teflf^ River, ZSBS 2498/0 (2; cotypes of H. cinerascens), Spix. 



Bahia: Bahia, ZSBS 2370/0 (type of H. alhomarginata), Spix; ZMB 16-7496, 

 Wucherer; ZMB 16-3103, Wagler; UZMK 13 and 14, Kypn; UZMK 16, 

 Audria, Jan. 4, 1871; BM 69.2.22.4, Cutter; BM 61.3.23.6, Wucherer 

 Ilh^us, Itabuna, BM 1924.9.20.5, Matthews. 



DisTRiCTO Federal: Jardim Botanico, MRHN Reg. 75 (type of H. ma>>sarH), 

 Massart, Aug. 31, 1922. Manguinhos, USNM 97244-7 and 99115-8, 

 Venancio, January-May 1935. Pico de Tijuca, MZUM 104143-5 (18), 

 Bailey, 1941. Rio de Janeiro, USNM 70510-5, Metcalf, September-October 

 1925; USNM 81110-1, 96353, A. Lutz, 1930; ZMB 16-7283, Burmeister; 

 UZMK 21, Reinhardt; BM 68.9.16.24, Cunningham; BM 55.4.18.19, Fry; 

 ZSBS (1), A. Lutz, 1932; ZSBS 56/1947 (4), A. Lutz. Santa Alexandrina, 

 USNM 96377, A. Lutz, October 1923. 



