POWER OF RECOGNITION AMONG ANTS. 



235 



made acquainted with 

 every predecessor in 

 this mixed colony and no 

 discord appeared in the 

 new nest. This mixed 

 colony was marked A. 

 On September 24, when 

 none of these ants was 

 less than twenty days 

 old, and none more than 

 forty-one days old, I 

 separated them accord- 

 ing to genera, putting 

 the Camponotus, the 

 Formicas and the Sten- 

 ammas each into a Fielde 

 nest that was new and 

 therefore had nonest- 

 aura. The nests were 

 respectively marked Ai , 

 Az and A3. No young 

 was permitted to hatch 

 in any nest, but inert 

 young from the workers' 

 eggs, or introduced lar- 

 vae from other nests 

 were always present 

 when tests of recognition 

 were to be made as se- 

 vere as possible. No 

 ant of any species was 

 admitted to either of the 

 segregated groups except 

 as recorded in the ex- 

 periments. 



Nest Ai. --On April 

 8, 1904, there were in 

 the Camponotus nest, 



Fie,. 2. Stenamma fitlvmti, with larvce and pupae ; 

 slightly magnified. Actual length 5 to 7 mm. 



