340 THE AMEBIC AN NATURALIST [Vol. L 



TABLE III 



i 



£ . 



I I 

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I, 

 zl 



s 



jji 



S 



| 



m 



M 

 L 



K 



J 



F 



G 

 H 



I 



1 72 X76 1 '. '.'. '. '} 



167x168:;;;; 

 89X86.;;;;; 



165-167X168 .... 



280X320 



130X135 



57X56 ... 



55X56 



51-57X56 



145X142 

 144X142 



90X93 i 



144-145X142 



136X137 i 

 136-140X137 1 



185X182 



102-103X101-105. 

 172-174X171 



— 

 2 — 



2 I — 

 6 — 



1 — 



2 — 



3 — 

 16 ! — 



10 5 



1 — 



5 | 2 



2 2 



6 2 



35 — 



— 1 42 



V- 

 — i 10 



20 



2 

 1 



3 

 17 



2 

 2 



1 



2 



1 



8 



1 — 



11 



1 



- 



- 





80X78 



79 X78 j 

 79-80-82 X78 



79-80X78 



16 — 



5 | — 





2 













varieties shown in Table II, is proved by the following 

 experiments. 



In 1911 a parallel cross was made between wild agonti 

 and dilute brown races. The making of this cross I have 

 recorded (1913; p. 55, Cross 20a ; p. 52, Cross 10a, etc.) in 

 a previous paper. The first hybrid generation consisted 

 of gray-bellied black agouti animals, 8 in number. The 

 second hybrid generation consisted of 55 animals which 

 were of the expected color varieties. In the third hybrid 

 and ensuing generations, including back crosses, I have 

 recorded more than 4,500 young. None of these animals 



