EAST AFRICAN REPTILES AND AMPHIBIAISIS 101 



YOUNG UNDER 40 MM. LONG 



Center of throat white; the tibio-tarsal articulation rarely reaches beyond the 

 nostril (range from eye to end of snout) aberdariensis. 



Center of throat almost always mottled; tibio-tarsal articulation usually reaches 

 beyond the end of the snout (eye to beyond the end of the snout) nutti. 



RANA OXYRHYNCHUS Smith 



Rana oxyrhynchus Smith, 1849, Illustr. Zool. S. Africa, vol 3, pi. 77, figs. 2 and 



2a-c. (Kafirland and region of Port Natal). — Boulenger, 1882, Cat. 



Batr. Sal. Brit. Mus., p. 51. 

 Rana aequiplicaia Angel (not of Werner), 1925, Reptiles et Batraciens, in 



Voyage de Ch. AUuaud et R. Jeannel en Afrique Orientale (1911-12). 



Paris, p. 40. (Mombasa Id.; Bura; Waki River, K. C.) 



3 (U.S.N.M. 22098-100) Jombeni Range, K. C. (Chanler) 1892. 

 6 (U.S.N.M. 40727-8, 40945-6, 41505, 41508) Nairobi, K. C. (Sm. 

 Afr. Exped.) 1909. 



1 (U.S.N.M. 40884) Wambugu, K. C. (Sm. Afr. Exped.) 1909. 



2 (U.S.N.M. 41686, 41802) Southern Guaso Nyiro, K. C. (Sm. Afr. 



Exped.) 1909. 

 2 (U.S.N.M. 42173-4) Rhino Camp, L. E. (Sm. Afr. Exped.) 1910. 

 14 (U.S.N.M. 49233-46) Mount Gargues, K. C. (Heller) 1911. 

 2 (U.S.N.M. 49406) Kenya Colony. (Heller) 1911-12. 

 1 (U.S.N.M. 57521) Tanganyika Territory. (Hurter) N. D. 



The masculine character of a swollen first digit is of little assistance 

 in separating the sexes in either R. oxyrhynchus or B. mascareniensis . 

 For these frogs a much more useful external character may be found 

 in the slit at the angle of the jaw of males; this slit being provided 

 for the extrusion of the vocal sack. It was found that this slit is 

 discernible in males of 27 and 28 mm. in length, so that only frogs 

 of less dimensions than these have been reckoned as young. 



The 10 males range from 27 to 41 mm. in length, with an average 

 of 37.3 mm. The 19 females range from 34 to 40 mm., with an 

 average of 43 mm. The single young one measures 22 mm. No. 

 22100 has obviously been reeoverd from a snake's stomach. 



Monsieur Angel has kindly permitted me to examine one of the 

 series of frogs which, in 1925, he referred to the Cameroon species 

 known as R. aequijilicata . The frog in question (P. M. 23.193) was 

 taken on the Waki River to the east of Lake Albert Nyanza. It 

 measures 35 mm. and appears to me to be a juvenile female R. 

 oxyrhynchus, a species in which there is a good deal of sexual variation. 

 Laid upon its back side by side with a Transvaal frog (M. C. Z. 7252) 

 and Nairobi (M. C. Z. 10340) specimen of oxyrhynchus they will be 

 seen to agree in the projection of the snoat beyond the anterior 

 margin of the lower jaw; also ia the slight trace of marginal webbing 

 on the penultimate phalanx of the fourth toe. The markings and 

 permanent coloring are essentially the same. 



