280 U.S. NATIONAL MUSEUM BULLETIN 288 



8. Mr. Werner C. A. Bokermann informs us that he cannot distinguish between 

 the voices of the populations in Sao Paulo, Rio de Janeiro, and Mato 

 Grosso. 



Thus, there seems to be no doubt that Hyla minuta is a species, like 

 most others in South America, that is in need of detailed study. 

 Until that day, we must once again say maneat. 



Specimens Examined 

 COLOMBIA 



Meta: Villavicencio, CJG 2336 (10); CNHM 81764-6; USNM 152108-11 

 BRAZIL: Bom Successo, Districto Federal, USNM 96197-9 (cotypes of H. 



pallens); Lages, Santa Catarina, BM 88.2.7.26 [1947.2.12.86-91](cotypes 



of H. bivittata) . 

 SURINAME: Onverwacht, CJG 2383. 

 TRINIDAD: BM 1911.9.8.6 [1947.2.13.83] (cotype of H. goughi). 



20. MICROCEPHALA gTOUp 



Small, yellowish frogs with small tympani, reduced webbing 

 between the fingers, small, rounded vomerine tooth patches, and with- 

 out conspicuous markings on the thighs. The three species now known 

 from Colombia may be differentiated as follows: 



a 1 . Dorsal pattern of four narrow, more-or-less distinct longitudinal dorsal 



stripes H. microcephala 



a*. Dorsal pattern not of dorsal, longitudinal stripes. 



b 1 . Dorsum mottled with dark blotches, no conspicuous subdermal lymph 



sacs H. riveroi 



b 2 . Dorsum unmarked, rather conspicuous subdermal lymph sacs. 



H. mathiassoni 



Hyla microcephala Cope 



Figure 28 



1886. Hyla microcephala Cope, p. 281 (type locality, mountain streams of 

 ChiriquI, Panama).— Gunther, 1901, p. 265.— Nieden, 1923, p. 257. — 

 Dunn, 1931, p. 413; 1933, p. 72.— Stebbins and Hendrickson, 1959, 

 p. 524.— Fouquette, 1960a, p. 58; 1960, p. 484.— Rivero, 1964a, p. 302. 



1922. Hyla under woodi. — Ruthven, 1922, p. 55. 



Diagnosis. — A small yellow frog with a pattern of four dark, narrow, 

 longitudinal dorsal stripes. 



H. microcephala apparently is closely related to mathiassoni and 

 riveroi of Colombia, but its dorsal pattern will distinguish it at once 

 from these two species. H. mathiassoni has no dorsal pattern, and 

 while the dorsal pigmentation in riveroi may occasionally be arranged 

 in longitudinal rows, there are never more than two such rows and 

 they are curved inward like a pair of reversed parentheses, ) (. The 

 absence of an hour-glass pattern on the back will distinguish micro- 

 cephala from phlebodes. 



