38 "P. S. NATIONAL MUSEUM BULLETIN 206 



Dimensions. — Head aad body 102 mm.; head length 28 mm., width 

 37 mm. ; femur 42 mm. ; tibia 40 mm. ; length of parotoid gland 23 mm.; 

 width 8 mm.; foot 43 mm.; hand 26 mm. 



Color in alcohol.- — The specimen is now dull wood brown to drab 

 above, lightening to pale yellowish olive on the legs; venter dull straw 

 yellow, immaculate except for some small gray dots on the posterior 

 belly and some heavier gray reticulations on the lower posterior femur; 

 the tips of the spinules on legs and supraocular crests are black. 



Variations.- — A second cotype of B. ruhescens, USNM 97237, also a 

 female, measures 117 mm. in total length. Its head is considerably 

 more blunt, the snout being only about three-fourths the eye diameter. 

 The ridge along the upper lip is somewhat larger and its color is 

 decidedly darker and more mottled. Irregular dark crossbands 

 appear on the legs, while a dull marbling of dusky brown and drab 

 appears over the top and rear of femur, on the sides, and to a lesser 

 extent on the forearm. Both females, taken in May, are greatly dis- 

 tended with eggs, showing that the egg laying extends well past the 

 warm season. Two other half-grown specimens are at hand, and 

 another labeled simply "Rio de Janeiro" probably referring to the 

 State, not the city. Scapular ridges are distinct in all, and the shape 

 of the parotoids is constantly a narrow ellipse pointing outwards 

 posteriorly, not tapering (an appearance of tapering is sometimes 

 caused by fusion of the first of the strong lateral series of warts present 

 in every specimen). The inner border of the parotoids is either 

 straight or very slightly concave, and the anterior half is not noticeably 

 wider than the posterior. The venter is immaculate in three individ- 

 uals: spots occur only posteriorly, on belly and femur, in two speci- 

 mens. No sign of tibial glands is to be found, this species seeming to 

 have less warty skin with fewer glands than do its neighbors B. 

 paracnemis and B. ictericus. The largest specimen, a fully adult 

 female, is 119 mm. long, as already noted, and it is probable that the 

 maximum size of the species does not greatly exceed this figure. 

 More specimens are needed, however, to get a true conception of the 

 degree of variation. The males have the inner surface of the thumb 

 black and roughened. 



Remarks. — By its build and general appearance, Bujo rujus appears 

 to be closer to B. arenarum Hensel than to any other toad occurring 

 in southeastern South America. Both species have the postocular 

 crest almost directly confluent with the parotoid, while in B. ictericus, 

 B. paracnemis, and B. marinus a short longitudinal branch of the 

 postocular crest makes a decided bridge across to the parotoid. 

 B. arenarum, however, differs in the shape of its crests, which suggest 

 those of paracnemis, the anterior part being much broader than the 

 tapering posterior, whereas the inner border is very concave. Another 



