102 BULLETIN 151, UNITED STATES NATIONAL MUSEUM 



When compared with adult R. aequiplicata (M. C. Z. 2652) from 

 Efulen, Kribi, Cameroons, and M. C. Z. 12843 from Benito River, 

 CamerooDS, it differs in the projection of the snout which, in aequi- 

 plicata, is rounded and scarcely projects; moreover, the webbing on the 

 penultimate phalanx of fhe fourth toe in aequiplicata extends broadly 

 to half way up the phalanx, not merely as a narrow margin. The 

 configuration of the snout in the region of the canthus rostralis also 

 differs considerably. In the matter ot coloring, however, it would be 

 almost impossible to find two frogs so closely in agreement, spot for 

 spot and marking for marking, as these three frogs from Nyanza 

 and the Cameroons. 



The identification of this R. oxyrhyncJius with R. aequiplicata has, 

 therefore, sfrved a most useful purpose in drawing attention to 

 their similarities; it seems more probable, if the extent of the webbing 

 on the fourth and fifth toes is a good criterion, that aequiplicata 

 is more likely to be a race of oxyrhynchus Smith than of mascareniensis 

 Dumeril and Bibron, though Werner described it as Rana mascaren- 

 iensis var. aequiplicata. 



RANA MASCARENIENSIS Dumeril and Bibron 



Rana mascareniensis Dum]6ril and Bibron, 1841, Erpdt. G^n., vol. 8, p. 350. 

 (Seychelles, Mauritius, Bourbon). — Boulengek, 1882, Cat. Batr. Sal. 

 Brit. Mus., p. 52 (part).— Stejneger, 1893, Proc. U. S. Nat. Mus., vol. 16, 

 p. 738. 



1 (U.S.N.M. 1G026) East Africa. (Aljbott) 1888-89. 

 10 (U.S.N.M. 40687-8, 41154-5, 41957, 41959-61, 42945, 42947) Mt. 

 Kenya to Fort Hall, K. C. (Sm. Afr. Exped.) 1909. 



1 (U.S.N.M. 41008) Fort Hall, K. C. (Sm. Afr. Exped.) 1909. 



13 (U.S.N.M. 41011, 41206-8, 41290-5, 42977-9) Wambugu, K. C. 



(Sm. Afr. Exped.) 1909. 

 3 (U.S.N.M. 41110-2) Mt. Kenya, K. C. (Sm. Afr. Exped.) 1909. 

 21 (U.S.N.M. 41440, 41454-73) Mt. Kenya Trip, K. C. (Sm. Afr. 



Exped.) 1909. 



2 (U.S.N.M. 41906, 42004) Lake Naivasha, K. C. (Sm. Afr. Exped.) 



1909. 

 13 (U.S.N.M. 49274-86) ? Sagalla, K. C. (Heller) 1911. 

 9 (U.S.N.M. 49310-8) Top of Mt. Sagalla, K. C. (Heller) 1911. 



The slit at the angle of the jaw in males was discernible in a 35-mm. 

 frog, so that only specimens of less dunensions have been considered 

 as young, and those above 35 mm. without a slit are assumed to be 

 females. 



The 23 males range from 35 to 55 mm. in length, with an average 

 of 45.6 mm. The 43 females range from 35 to 62 mm., with an 

 average of 47 mm. The seven young range from 26 to 34 mm., with 

 an average of 30 mm. 



Of the total of 73 frogs only 7 have spotted throats, 4 are inter- 

 mediate, and the rest immaculate. There is a fine hairlike light line 



