1907,] ox A NEW AMAZONIAN TEEE-FKOG. 135 



Plate VII. 



The figures illustrate the ossicone of the right side of Major Powell Cotton's 

 male Okapi. 

 Fig. 1. The specimen of the natural size, seen from the right. 



2. The base of the ossicone, held by soft tissue to a snnilarly madrepore-like 



surface of the frontal bone. Natural size. , ■ , i 



3. Surface of the horn-tip, left side, enlarged to twice the natural size to show 



the absence of polishing and of transverse fissures. The ossicone was com- 

 pletely covered by integument ; it had not been " cut " or emerged. 



4. Similar view of the right side. 



5. Similar view of the hovn-tip from in front. 



6. Similar view from behind. ■ i i 



7. The horn-tip has been sawn through so as to remove the right-hand moiety 



of the tip. The extremely dense, ivory-like character of the bone of this 

 region is thus demonstrated, and the absence of horizontal or other pene- 

 trating fissures (compare and contrast with the text-figures, especially text- 

 fig. 52). 



4. Description o£ Byla resimfictrix Q^oqUi, a new Amazonian 

 Tree-Frog peculiar for its Breeding-habits. By Prof. 

 Dr. Emil a. Goeldi, C.M.Z.S., Director of the Para 

 Museum. 



[Received January 21, 1907.] 



(Text-figures 56-59.) 



In its warty skin this remarkably fine Tree-Frog resembles Hyla 

 tuhercidosa Giinther, Hyla taurina Steindachner, and Eyla veim- 

 losa Laur. It is most closely related to the last. 



Length of a male, 8 cm. from snout to vent. 



Head semicircular. Space between the two nostrils slightly 

 concave. Nasal region descending abruptly to the border of the 

 mouth, almost at right angles to the frontal plane. Oanthus 

 rostralis running in a curve, rounded off. Nostrils, seen from 

 above, forming slight prominences. Ohoanaj large. Yomerme 

 teeth 'in two rows, forming an angle pointing forwards. Tongue 

 heart-shaped. 



Tympanum very distinct, moderate sized, rather smaller than 

 the eye. In the male distinctly prominent vocal sacs between the 

 rictus of the mouth and the insertion of fore-legs. 



Fingers III, I\^, and Y connected about half their length by 

 a web ; no perceptible rudiment of thumb. Finger-disks large, a 

 little smaller than the tympanum. Outer border of arms without 

 folds of the skin. When the hind legs are stretched forward, the 

 tibio- tarsal articulation reaches the eye or the border of the mouth. 

 Heels without appendage. 



Tubercles of sole of foot not so prominent as m Hyla taurina. 



Colour greenish-yeUow with blackish- brown markings : a brown 

 trapeze-shaped field between nose and anterior border of eyes ; a 

 light-coloured, broad band running from one eye to the other, 

 the width of the eye, anterior bordering line straight, posterior 

 line slightly curved backwards ; a large dark field covering all the 

 dorsal region, laterally running down to the insertion of the fore 



