358 U.S. NATIONAL MUSEUM BULLETIN 2 88 



There is a marked sexual dimorphism in size. The head-and-body 

 lengths of the males are 26.9, 27.8, and 28.7 millimeters; the two 

 females measure 36.4 and 37.2 millimeters. 



Although there was no call identified with this species there can 

 be no doubt about the maturity of the specimens, as the two females 

 are packed with pigmented eggs. 



Specimens Examined 

 COLOMBIA 



Amazonas: Leticia, UF 8506 (type), 8507 (5). 



Genus Tetraprion Stejneger and Test 



1891. Tetraprion Stejneger and Test, p. 167 (type species. Tetraprion jordani 

 Stejneger and Test). 



Generic diagnosis. — Derm of head co-ossified with skull and skull 

 strongly exostosed; teeth on vomers, palatines, and parasphenoid ; 

 no teeth on mandible. 



Tetraprion jordani Stejneger and Test 



Plate 44d-f 



1891. Tetraprion jordani Stejneger and Test, p. 167 (type locality, Guayaquil 

 Ecuador) .—Myers, 1942, p. 152.— Cochran, 1961, p. 80.— Goin, 1961 

 p. 15.— Gorham, 1963, p. 24. 



Diagnosis. — A hylid without mandibular teeth or odontoids, but 

 with vomerine, palatine, and parasphenoid teeth, and without a well- 

 developed proboscis. 



The character of the teeth will at once distinguish this species from 

 all other South American frogs. 



Description. — USNM 152754, from Imbili, Rio Mira, Narino, 

 Colombia. Vomerine teeth in two short, heavy, transverse series, lying 

 close together on a level with the posterior borders of the moderate- 

 sized, rounded choanae; two longitudinal rows of teeth on the posterior 

 portion of the parasphenoid, teeth discernible beneath the oral epithe- 

 lium on the lateral portions of the palatines; tongue three-fourths as 

 wide as mouth opening, broader than long, its posterior border very 

 slightly free and with just a hint of a notch. Snout rounded when 

 viewed from above, rather pointed in profile, the upper jaw extending 

 considerably beyond lower; nostrils more superior than lateral, not 

 projecting, their distance from end of snout about one-third that from 

 eye, separated from each other by an interval equal to about two- 

 thirds their distance from eye. Canthus rostralis a sharply defined 

 bony ridge, loreal region very concave and oblique, the upper lip 

 flaring out strongly below it. Eye moderate, its diameter equal to two- 

 thirds its distance from nostril; palpebral membrane not reticulate; 



