FROGS OF SOUTHEASTERN BRAZIL — COCHRAN 153 



Variations. — The heavy plaited folds of skin on the throat of the 

 male prove the presence of a large external vocal sac. The species is 

 apparently very stable as to bodily proportions and color pattern, 

 for the extremely elongate snout and undershot "shark's mouth" is 

 equally developed in the series of nine at hand, while the four dark 

 stripes separated by lighter areas, and even the narrow median dark 

 line, are to be seen in those which have kept their pattern at all. The 

 heel reaches to between the tip of the snout and the eye in all examples. 



Remarks. — As Mrs. Helen T. Gaige pointed out to me while ex- 

 amining the H. squalirostris specimens, H. parkeri Gaige is a close 

 ally, a fact that links squalirostris definitely to the rubra group. In 

 spite of the obvious similarities, however, the differences between 

 squalirostris and parkeri are great and constant. Not only is the 

 snout of squalirostris longer than that of the sharp-nosed parkeri, its 

 tjrmpanum and eye are much smaller in proportion to the snout length, 

 while the toes have less webbing and the disks of fingers and toes are 

 smaller. The size of adults is about the same in both species, and 

 their coloration is practically identical. 



Two frogs collected by Dr. B. Lutz in Teres6polis in March 1945 

 resemble squalirostris in the overhanging upper jaw and somewhat in 

 color and body proportions, but have shorter snouts and larger eyes, 

 H. lindneri Miiller and Hellmich, from the Chaco region, is similar in 

 general appearance but has significantly greater head width and 

 femoral and tibial lengths than squalirostris. 



According to Dr. A. Lutz, this species is entirely nocturnal and is 

 not seen or heard before 10 o'clock. It was first heard late at night 

 by Bertha Lutz, who remarked on a new caU coming from plants in 

 the bog near the house of the Fazenda do Bonito. Later on, it was 

 observed often to ascend the stalks of Juncus growing in this place, 

 where it would perch at the tip and sing late at night. Its voice is 

 like the sound made by winding a watch, cr, cr, cr, with a trilled r. 

 No eggs or young are known. The species is not common. The 

 adult is very active in jumping and is difficult to catch because of its 

 exceeding slenderness. 



It somewhat suggests Hyla polytaenia Cope in its longitudinal strip- 

 ing of white and dark brown or black, but the two species are not at 

 all similar in other respects. 



Specimens examined 

 BRAZIL: 



Rio de Janeiro: Bonito, Serra da Bocaina, USNM 96719-20 (cotypes), A. Lutz, 

 B. Lutz, and Venancio, Jan. 16-30, 1925. Serra da Bocaino, USNM 9660&- 

 13, 96721, A. Lutz; ZSBS (2), A. Lutz, 1932. 



