366 U- S. NATIONAL MUSEUM BULLETIN 206 



irregular white patch on the posterior femur, leading into a white 

 area, which covers the posterior and lower tibia almost completely. 

 The Trinidad specimen, USNM 98779, has two round spots on the 

 posterior femur. The ventral coloration does not seem to have 

 zoogeographic significance, either, since examples with spotted as 

 well as immaculate lower surfaces are found in widely separated areas. 

 Remarks. — The color pattern needs to be studied by rearing groups 

 of frogs of known parentage in order to see whether the spotted 

 ventral surface and the broad light femoral stripe are truly associated 

 as a mutant of frogs having the immaculate venter and narrow 

 femoral line. Dunn (1949) believes that two small species exist, 

 one with immaculate white belly and a narrow stripe on the femur, 

 the other with dark, Hght-dotted belly and a broad femoral stripe. 



Specimens examined 

 BRAZIL: 



MiNAS Gerais: Rio Pandeiro, IB 508. Sete Lag6as, CM 2644-5, Haseman, 



May 8, 1908. 

 Pernambuco: Caruaru, USNM 97106, Pickel. Tapera, USNM 97088, Pickel, 



Dec. 4, 1928. 

 Rio de Janeiro: CM 2511, Haseman. 



Rio Grande do Sul: Near Porto Alegre, ZSBS (1), Gliesch, Aug. 25, 1926. 



Santa Catarina: Lagoa, IB 554, 562-4, 568, USNM 121332. Ouro Verde, 



ZSBS (1), Loffler, Nov. 15, 1927. S5o Leopoldo, USNM 103617, Plaumann, 



November 1937. 



Sao Paulo: Butantan, USNM 121333; IB 184, 186. Jundiaf, IB 576. 



Luzitania, IB 109. 



COLOMBIA: USNM 14718, King. Fundaci6n, USNM 51215 (paratype of 



Hypopachus pear si), Ruthven, Aug. 15, 1913. 

 PARAGUAY: Puerto Bertoni, USNM 94101, Bertoni. 

 TRINIDAD: Nariva Swamp, USNM 98779, Weber, Dec. 4, 1934. 



Genus Hypopachus Keferstein 



1867. Hypopachus Keferstein, p. 351. (Genotype, Hypopachus seebachii 

 Ke{eT8tein= Engy stoma variolosum Cope). 



Generic diagnosis. — Prevomer divided, the postchoanal portion 

 absent; palatine absent. Clavicles and prevomer present, almost 

 straight, reachiDg the midline of the girdle and the scapulae; omoster- 

 num absent, sternum cartilaginous. Vertebral column diplasiocoelous. 

 Terminal phalanges simple. Pupil round or rhomboidal. Tongue 

 large, oval, entire and half free behind. Two smooth dermal ridges 

 across the palate in front of the pharynx, the anterior much shorter 

 than the posterior. Digits not dilated. Tympanum hidden; first 

 finger shorter than second, and third toe longer than fifth. 



