RELATIVE VIABILITY IN MAMMALS AND BIRDS. 455 



The recoi'ds of Bubaline Antelopes correspond closely with 

 those of cattle. From their smaller size so high a potential 

 longevity is not to be expected, whereas, on the other hand, the 

 higher average duration is probably due to the absence of young 

 calves, the mortality amongst which lowered the record of cattle. 



r^ „ . .r ^^TTT^T ^ No. of Av. dur. Max. duv. 



CePHALOPHIN^. j^^j^ iu months, in months. 



Cephalophus, whole genns 49 23 109 



C corojia^MS (Crowned Duiker) 4 11 20 



C.dorsalis (Bay „ ) 7 26 75 



C. grimmi (Common ,, ) 13 22-7 107 



C. maxwelli {MniLweWs „ ) 10 34 109 



C. moHtlcola {Blue „ ) 9 14-9 43 



C. nigrifrons (Black-fronted Duiker) 13 3 . 



C. riMatihs (Red-flanked „ ) 4 27 38 



C. sylvicultrix (Yellow-backed „ ) 1 3 3 



Tetraceros quadricornis (Four-horned 19 28 66 



Antelope). 



The maximum and average durations of the Cephalophine 

 Antelopes are rather lower in proportion to their size than those 

 of the Bubaline Antelopes. There has been omitted from the 

 tables, however, a considerable number of examples that lived less 

 than a month in the Gardens. 



NeOTRAGIN^. ^%9^ Av.dur. Max. dur. 



Indiv. m months, in months. 



Oreotragus saltator {KXi^s^yvingev) 1 4G 46 



Raphicerus melanotis {Gvys-ho^ 2 6*5 10 



R. tragidus (Stein-bok) 2 3 4 



Ourebia nigricaudata (Gambian 3 40 105 



Ourebi). 



The number of individuals is too small to make inferences 

 useful'. 



CeRVICAPRIN^.. ^°-°f .Av.dur. Max. dur. 



Indiv. in months, in months. 



Cohus ellipsi2)rymrms{Govi\rao\\Wsitev- 3 39*3 47 



buck). 



C. unctuosus (Sing-sing Water-buck). 4 100 183 



Cervicapra isahellina (Isabelline 2 19 36 



Antelope). 



C. holior (Bohor Antelope) 2 43 83 



Antilopin^. 



Gazella, \N\\ole genws. 118 24-4 112 



G. arahica (Arabian Gazelle) 20 18 71 



G.hennetti{li\di\axi „ ) 11 10-8 57 



G. cuvieri (Cuvier's „ ) 1 3 3 



G. dorcas (Egyptian „ ) 27 22-7 94 



6^. e^^c^ore (Spring-bok) 9 20 65 



30* 



