MR. E. G. BOULENGER ON" TWO NEW TREE-FROGS. 243 



20. On Two New Tree-Frogs from Sierra Leone, recently 

 living in the Society's Gardens. By Edward G. 

 Boulenger, F.Z.S., Curator of Reptiles. 



[Received April 9, 1915 : Read April 27, 1915.] 



Index. 



Sj'sternatic : Page 



Rappia aylmeri, sp. n 243 



B. chlorostea, sp. n 213 



Among a collection of Reptiles and Batrachians collected by 

 Mr. Guy Aylmer, F.Z.S., in Sierra Leone last year and presented 

 by him to the Society, I found two frogs of the genus Rappia 

 which have not hitherto been recorded. I propose for the one 

 the name of Rappia aylmeri, after its discoverer, for the other 

 Rappia chlorostea, from the green colour of its bones, visible 

 through the skin, a character well known in many species of Hyla 

 and Pseudis, but which has not been observed in any of the 

 numerous representatives of the genus Rappia. 



Rappia aylmeri, sp. n. 



Head as broad as long. Snout rounded, equal in length to the 

 diameter of the eye. Tympanum hidden. Fingers very slightly 

 webbed at the base. Toes half-webbed. The hind-limb being 

 carried forward along the body, the tibio-tarsal articulation 

 reaches slightly past the eye. Skin smooth, granular on the 

 belly and under the thighs. Pale brownish above, uniform. 



Rappia chlorostea, sp. n. 



Head as broad as long. Snout squarely truncate, as long as 

 the diameter of orbit. Loreal region almost vertical. Nostril 

 near the end of the snout. Tympanum distinct, about half the 

 diameter of the eye. Outer fingers one-third webbed, toes two- 

 thirds webbed. The hind-limb being carried forward along the 

 body, the tibio-tarsal articulation reaches to the tip of the snout. 

 Tibia a little more than half the length of the head and body. 

 Skin smooth, except on the belly which is feebly granular. 



Green above ; a silvery dark-edged streak running down the 

 sides, passing through the eye, extends from the snout to nearly 

 the end of the body. 



The bones which are visible through the skin are of a bright 

 green colour. 



