176 U- S. NATIONAL MUSEUM BULLETIN 2 06 



Color in alcohol. — Dorsal ground color smoke gray; an irregular 

 gray mark on the occiput with anterior prolongations extending onto 

 the eyelids, the whole outlined with a narrow slate-gray line; another 

 irregular, outlined marking on each side of the back ; anal region pearl 

 gray, with a dark transverse line across it and another paralleling it 

 in front; anterior and posterior surfaces of femur immaculate burnt 

 umber, the narrow strip of ground color covering the upper surface 

 traversed by three or four dark-edged, brown crossbars; an umber 

 axillary spot; remainder of upper surfaces of legs and arms with 

 more or less distinct, dark-edged brown crossbars; upper lip with 

 alternating diagonal patches of pearl gray and umber; chin pale 

 olive-buff with very fine dark dots; chest and belly wood brown; 

 lower parts of arms and legs russet. The sides of the neck around 

 the vocal pouches of the male are suffused with dark slate color. 



Variations. — Considerable color variation occurs among the speci- 

 mens USNM 96497, 96499, and 96500 (from the same locaHty as the 

 described specimen). The last mentioned of these is chocolate to seal 

 brown above, with a pale area on the center of the snout; the dark 

 ou times to the dorsal markings nevertheless stand out very clearly; 

 96499 is intermediate in tone between this dark specimen and the 

 lighter ones, as it has rather heavy dark bandings on the legs but a 

 light dorsal ground color; while 96497 is very much like the described 

 specimen in tone. All of them show on the front and back of the 

 thigh the elongate umber-to-chocolate area that appears to be a 

 rather easily recognizable character of this species. In 96497 the 

 dorsal skin approaches the described specimen in roughness, but the 

 other two are nearly smooth, with only a few very faint pustules 

 appearing on head and on sacrum. Two rather faded specimens, 

 USNM 96495-6, from the same locality, show an almost smooth dorsal 

 skin, perhaps due to their softening in preservative. The dark out- 

 lines to the dorsal markings have remained very clear and sharp; 

 96496 has a conspicuously truncate snout when viewed from above or 

 in profile. 



An adult female, from Rio Gugogi, Bahia, is simQar in color pattern 

 to the Angra dos Reis frogs, except that the dorsal marking is median, 

 anteriorly bifurcating onto the eyelids and posteriorly onto the sides, 

 and the dark femoral crossbands are not confined to the upper surface 

 but extend onto the light posterior surface, there becoming con- 

 siderably darkened, so that the rear of the femm' is no longer immacu- 

 late. In addition, the Bahia frog has a distinct skinfold across its 

 chest; its legs are slightly shorter than those of the described specimen, 

 the heel on the adpressed leg reaching to between eye and nostril, 

 and the elbow and knee not quite touching when limbs are laid along 

 the side; its head is apparently wider in proportion to its length. 



