174 U. S. NATIONAL MUSEUM BULLETIN 206 



around the margin of the lower lip; dermal serrations along outer limb 

 borders; disks and webs on toes and fingers relatively large; hind legs 

 rather short; a similar marbled color pattern on the back, and usually 

 a great deal of orange on the femur and on the membranes between the 

 fingers and toes. 



Hyla microps seems to deserve full specific rank because of its con- 

 stantly white upper lip not found in marmorata subspecies, and its 

 smaller adult size. Structurally it differs mainly in having slightly 

 less extensive webs and in having the axillar "wing" less well developed 

 than in the subspecies of marmorata. Kegarding the latter, it is still 

 somewhat doubtful if senicula and melanargyrea deserve even sub- 

 specific rank imder marmorata, so great is the variation in each of 

 these forms as to degree of webbing on hands and feet as well as color 

 pattern. Except for the geographical separation and the resulting 

 slight variations in color pattern that appear to have a regional 

 significance, it might be impossible to keep them apart. The ap- 

 parently complete webbing of toes and fingers in typical marmorata 

 from Guiana is approximated in many of the southern and western 

 individuals of senicula and melanargyrea. Although some of the 

 senicula from Rio de Janeiro are uniformly pale on the ventral region, 

 a few show a darker tone on the under part of the legs, but this does 

 not approach the highly mottled lower legs and dusky chin and belly 

 of melanargyrea or the black inferior tibia and tarsus and spotted chin 

 and belly of typical marmorata, from Guiana. 



Hyla giesleri Mertens (1950, p. 185, figs. 8, a, b) fromBarro Branco, 

 Colonia de Imbarie, Rio de Janeiro, belongs in this group, but as I 

 have seen no examples, further comment is withheld. 



Hyla marmorata senicula Cope 



Plate 16, Figures d-g 



1868. Hyla senicula Cope, p. Ill (substitute name for Hyla marmorata Burmeis- 

 ter (not of Daudin) ; type locality, Corcovado, Rio de Janeiro). — Boulen- 

 GER, 1882a, p. 391; 1888c, p. 417; 1903a, p. 69.— Baumann, 1912, p. 

 163.— L. MtJLLER, 1922, p. 171; 1927, p. 266.— Nieden, 1923, p. 288.— 

 Mertens, 1950, p. 188, fig. 10. 



1868. Hyla dasynota GtJNTHEB, p. 488, pi. 38, fig. 2 (type locality, Brazil). — 

 BouLENGER, 1882a, p. 392. — Nieden, 1923, p. 289. 



1912. Hyla dasynotus Baumann, p. 163. 



1926. Guntheria dasynota Miranda-Ribeiro, p. 67, fig. 38. 



Description. — Adult male, USNM 96498, Angra dos Reis, Rio de 

 Janeiro. Vomerine teeth in two short, heavy, transverse, narrowly 

 separated patches between the posterior levels of the choanae; tongue 

 conspicuously small, only one-half the width of mouth opening, cordi- 

 form, deeply nicked on its free posterior margin; snout short and very 

 bluntly rounded when viewed from above, truncate in profile, the 



