146 SISTER ANTS RECOGNISED 
their nest as pup, attended by friends and restored to 
their own nest, were amicably received. 
What is still more remarkable, of twenty-two ants 
belonging to F. fusca, removed as pupz, attended by 
strangers, and returned to their own nest, twenty were 
amicably received. As regards one I am doubtful; the 
last was crippled in coming out of the pupa-case; and 
to this perhaps her unfriendly reception may have been 
due. 
Of the same number of Lasius niger developed 
in the same manner from pupe tended by strangers 
belonging to the same species, and then returned into 
their own nest, nineteen were amicably received, three 
were attacked, and about two I feel doubtful. 
On the other hand, fifteen specimens belonging to 
the same two species, removed as pupe, tended by 
strangers belonging to the same species, and then put 
into the strangers’ nest, were all attacked. 
The results may be tabulated as follows :— 
Papz brought up Pupz brought up by strangers, 
by friends and Put in own Put in strangers’ 
replaced in their own nest. nest. nest. 
Attacked ........ 0 7 15 
Received amicably . , 33 37 0 
The differences cannot be referred to any difference 
of temperament in different nests. The specimens of 
F. fusca experimented with in August and September 
last were taken principally from two nests, numbered 
respectively 36 and 60. Now, while nest 36, In most 
' I do not feel sure about three of these, 
