EAST AFRICAN REPTILES AND AMPHIBIANS 99 



I (U.S.N.M. 40693) Meru, K. C. (Sm. Afr. Exped.) 1909. 



12 (U.S.N.M. 40735, 41096-103, 41105, 41107-8) Mt. Kenya, K. C. 

 (Sm. Afr. Exped.) 1909. 



II (U.S.N.M. 40762-5, 41503-4, 41506-7, 41509-11) Nairobi, K. C. 



(Sm. Afr. Exped.) 1909. 

 46 (U.S.N.M. 40770-4, 41009-10, 41209-19, 41255-73, 42973-6, 42980- 



7) Wambugu, K. C. (Sm. Afr. Exped.) 1909. 

 25 (U.S.N.M. 41421-39, 41441-6) Mt. Kenya Trip, K. C. (Sm. Afr. 



Exped.) 1909. 

 3 (U.S.N.M. 42058-60) Kenya Colony. (Heller) 1911-12. 

 8 (U.S.N.M 49266-73) ? Sagalla, K. C. (Heller) 1911-12. 

 1 (U.S.N.M. 65912) Kasorongai River, K. C. (Mearns) 1909. 



The above series consists of 42 males, 91 females (possibly including 

 some immature males also), and 15 young. I propose discussing these 

 groups separately to facilitate comparison with similar groups of 

 Rana aherdariensis. 



Males may be readily distinguished from the females by the swollen 

 base of the first digit. This series of 42 frogs gives a range in length 

 from 35 to 55 mm.; except for a single frog (No. 40693), measuring 

 65 mm., the average ol the whole series is 49.7 mm. Thus it will be 

 seen that there is no appreciable difference in size between the males 

 of aherdariensis and those of nutti from the same region; it is, how- 

 ever, important to draw attention to the fact that these frogs from 

 Northern Kenya are much smaller than those from central Tangan- 

 yika Territory.''^ Other characters noticed are: 



1. Lateral gular pouches always absent. 



2. Center of the throat is usually spotted, in several it is very 

 faintly so, and in 13 quite unspotted; this character appears to be 

 quite unrelated to age or locality. 



3. The tibio-tarsal articulation of the adpressed hind limb usually 

 extends well beyond (5 to 15 mm.) the end of the snout; in only one 

 frog (No. 49271) does it only reach the level of the snout. 



4. Minute spinosities are present on the back and flanks but do 

 not extend in a band across the belly as in aherdariensis. 



The 91 females show a range in length from 40 to 75 mm.; except 

 for a single frog (No. 40770), measuring 95 mm., the average of the 

 whole series is 54.2 mm. They also average much smaller than the 

 females in the large series from central Tanganyika Territory. 



2. Center of the throat is usually spotted; thus 73 have spotted 

 throats; 7 are very faintly so; 11 are unspotted. 



3. The tibio-tarsal articulation of the adpressed hind limb usually 

 reaches well beyond the end of the snout, but there are a few excep- 

 tions; thus in No. 49269 it only reaches the end of the snout, and in 

 Nos. 41436 and 41444 only to the nostril, 



4. The breeding spinosities of the females are faintly represented; 

 that is, as compared with the males. 



<» Mem. Mus. Comp. Zool., vol. 50, p. 196, 



