80 U.S. NATIONAL MUSEUM BULLETIN 288 



do not form distinctive isolated yellow spots, being continuous with 

 the yellow of the belly. The largest specimen of Elachistocleis oualis 

 at hand has a head-body length of 39.3 millimeters. 



Specimens Examined 

 COLOMBIA 

 BoyacX: Corozal, near Rio Casanare, USNM 152032-3. 

 C6rdoba: Junguilla, Cano Betancf, USNM 152158. 



Meta: Cano Guapaya, Serrania de La Macarena, CJG 2340; Villavicencio, 

 CNHM 81816, USNM 152204-8, MLS 132, 132a; Granada, on Rio Ariari, 

 USNM 151967-76. 

 Vichada: Amenavn6, Rio Guaviare, USNM 152316. 

 VENEZUELA: Palenque, Guarico, USNM 128847-9. 



Genus Glossostoma Giinther 



1900. Glossostoma Giinther, p. 210 (type species, Glossostoma aterrimum Giinther) # 



Generic diagnosis. — Clavicles and procoracoids absent, but palatines 

 present. Tympanum concealed. Snout not particularly pointed. 

 Only one species is known from Colombia. 



Glossostoma aterrimum Giinther 



Figure 3 



1901. Glossostoma aterrimum Giinther, p. 210 (type locality, Costa Rica). — 



Boulenger, 1913, p. 1025.— Nieden, 1926, p. 68.— Carvalho, 1954, p. 



11.— Gorham, 1963, p. 26. 

 1927. Gastrophryne aterrimum. — Parker, 1927a, p. 5. 

 1934. Microhyla aterrimum. — Parker, 1934a, p. 143. — Dunn, 1944c, p. 524. — 



1949, p. 16.— Taylor, 1952, p. 914. 



Diagnosis. — A microhylid with the tympanum concealed, clavicles 

 and procoracoids absent, but palatines present. 



Glossostoma aterrimum may be distinguished from species of the 

 genera Relictivomer, Elachistocleis, and Otophryne by the absence of 

 clavicles and procoracoids and from those of Ctenophryne by the 

 presence of palatine bones. 



Description. — CNHM 63849, four kilometers northeast of Bella- 

 vista, above Rio Porce, Antioquia, Colombia. A microhylid without 

 vomerine teeth; choanae rather large and broadly rounded; tongue 

 two-thirds as wide as mouth opening, broadly ovate, its posterior 

 border free and unnotched. Snout large for a microhylid, rather rounded 

 when viewed from above, nearly truncate in profile, the upper jaw ex- 

 tending slightly beyond lower; nostrils more lateral than superior, 

 very slightly projecting, their distance from end of snout about 

 two-thirds that from eye, separated from each other by an interval 

 slightly greater than distance from eye. Canthus rostralis poorly 



