On new West-African Frogs. 281 



small and irregular himella?. Tcgmina wood-brown, more 

 strongly luimped than in the male, blackish on the hump, and 

 whitish towards the base. Wings as in the male, except 

 that the whole membranous area is brown, tessellated with 

 irregular rows of large subhyaline spots. 



JIah. W. Africa {Swanzy). 



In the true P. centaurus the wings of the female are 

 blackish, with the subhyaline spots much more numerous, 

 much smaller, less confiuant, and more regular. 



XXXI. — Descriptions of new West-African Frogs of the 

 Genera Petropedetcs and Bulua. By G. A. BoULENGtiU, 

 F.R.S. 



A FEW years ago * I had occasion to offer some remarks on 

 the genus Petropedetes, Reicheno^v, and pointel out the 

 differential characters of the three S[^e2ie3 then known, all 

 three from West Africa, viz. P. cameronensis, Reichen., the 

 type of the genus, with the toes half-webbed and the tym- 

 panum half the diameter of the eye; P. Joknstoni, Blgr., with 

 a mere rudiment of web between the toes, and the tympanum 

 half the diameter of the eye ; and P. [Tympanoceros) Newtoni, 

 Bocage, with a mere rudiment of web between the toes and 

 with a very large tymj^anum, remarkable for the presence, in 

 the male, of a dermal appendage projecting from its centre. 

 I have since received examples of two new species, differing 

 from those previously described in the fully webbed toes, 

 and for these I propose the names P. natator and P. pahnipes; 

 the former is from Sierra Leone, the latter from South 

 Cameroon. The genus Bulua was described by me quite 

 recently f for a new frog from South Cameroon, B. ventri- 

 marmorata ; a second species, from the same country, may 

 now be added, and is here described as B. albiventris. 



Petropedetes natator. 



Tongue rather feebly notched behind, without conical 

 paj)illa. Vomerine teetli in two small groups close together 

 behind the level of the choanse. Head strongly depressed, a 

 little broader than long ; snout rounded, shorter than the 



• r. Z. S. lf)00, p. 439. 



t Aun. & Mag. A'at. Hist. (7) xiii. 1904, p. 262. 



Ann. (£• Mag. N. Hist. Ser. 7. Vol. xv. 20 



