EAST AFRICAN REPTILES AND AMPHIBIANS 117 



1 (U.S.N.M. 57522) Uganda. (Hurler) N. D. 



5 (U.S.N.M. 63369-72, 63535) Elizabethville, B. C. (Raven), 1919-20. 



1 (U.S.N.M. 63393) Albertville, B. C. (Raven) 1919-20. 



1 (U.S.N.M. 63489) Victoria Nyanza. (Raven) 1919-20. 



Taking the series collected by the Smithsonian Expedition of 

 1909, first it may be said that they agree in having the outer fingers 

 ■one-half webbed ; every toe is webbed to the disk on one side, though 

 in the case of the fourth it would be better described as being webbed 

 to the base of the last phalanx; actuall}'^ it is continued as a narrow 

 margin to the base of the disk, though this fact can only be ascer- 

 tained in well-preserved specimens. While the skin of the majority 

 is smooth, three frogs (Nos. 40891, 40913, 41687) have warty backs. 



The color is divisible into five types. 



1. Practically pure white, unspotted. (Juja Farm; Naivasha.) 



2. White or ashy-white, with minute but well-defined black dots. 

 (Jombeni; Juja; Naivasha; Nairobi.) 



3. Grayish to deep blue-gray, this resulting from the black dots 

 being so numerous and close together. (Naivasha; Nairobi.) 



4. Buffy brown. (Naivasha.) 



5. Two of the warty frogs (Nos. 40913, 41687) mentioned above are 

 a grayish color, but the flanks and limbs are vermiculated with black 

 like the plate of Peter's H. marginatus ,^^ a species which Boulenger 

 relegated to the synonymy of marmoratus in 1882. 



Many of these Nairobi and Naivasha frogs have been compared 

 with the specimens from Nairobi reported on by Miss Procter and 

 with which they are obviously specifically identical. 



In length these Smithsonian Expedition specimens range from 

 15.5 mm. (an example with a rudimentary tail) to 30 mm. (female). 



Taking the remaining specimens listed from five localities, it 

 •may be remarked that the transverse orbital diameter is, in every 

 instance, a trifle longer than the distance between the anterior 

 border of the orbit and the eye. In No. 57522 the outline of the 

 tympana are faintly visible in a good light. In No. 03535, a very fat 

 female, the tibio-tarsal articulation just falls short of the eye. Apart 

 from these variations all agree with the revised description of the 

 species given by Boulenger in 1882. It might be added that the 

 outer finger is webbed half its length, and the outermost toe actually 

 to the disk. 



The larger size (35 mm.) of the Albertville and Victoria Nyanza 

 frogs leads me to imagine that they represent a distinct species, but 

 the latter is too dried to be of much use, though its colors are vivid. 

 The chief color variations are: 



1. No. 49320 answers remarkably well to Giinther's description 

 of the coloration of H . jlavomaculatus from Rovuma Bay. Boulenger 

 later referred the type to Megalixalixs and Mr. H. W. Parker has very 



X Peters, 1882, Reise nach Mosamb., vol. 3, pi. 22, flg. 8. 



