1901.] NATURAL SCIENCES OF PIIILADELrHIA. 445 



the two ill the manuer usual witli colonies that have two esteemed 

 (jueetis. 



That the recognition of the ants is not personal is proven by 

 the following fact: Workers hatched in nest C-c during the first 

 half of ISToveraber, 1900, were isolated in nest A-a, while workers 

 hatched in nest C-d during the same period of time were isolated 

 in nest A~b. The two sections C-e and C-d had each its own 

 queen, workers and young, and there was no communication 

 between the two nests after the division of the original colony on 

 September 7. Between nests A-a and A-h there was no com- 

 munication, and these two nests contained workers only. The 

 workers of nest A-a had never during their active lives met those 

 in A-b nest until six mouths after they all became ants, when I 

 put them together in a Petri cell. There was at first an exhibi- 

 tion of mutual distrust, and even of animosity, which gradually 

 disappeared when the antennae had been passed over the bodies of 

 the strangers, and in a half-hour all were amicably congregated 

 in a single group. 



These ants have a habit of bringing their bodies to a low level, 

 stretching their legs wide asunder, and creeping slowly up to an ob- 

 ject of suspicion, in a manner that is quite catlike in its stealthiuess; 

 and this mode of appnmching was often used toward the straugei's, 

 after the antennte had once touched. 



I also transferred pupie fnmi C-d nest to the care of queens of 

 other colonies, and left them there in the care of aliens until they 

 became ants and reached the age of about sixteen days. On 

 returning these callows to the C-d nest, which they had left as 

 pupa3, they exhibited great fear of their relatives and hosts, sought 

 to stay in parts of the nest most remote from the resident com- 

 munity, hid themselves, and showed all the trepidation usual in 

 ants that are put into a nest of aliens. On the other hand, the 

 resident ants made no unfriendly demonstrations toward the new- 

 coniers, and aft^r these callows were forced iui;o association with 

 them by confinement with a few of the adults in a small space, 

 the callows lost their fears and thereafter mingled freely and hap- 

 pily with all in the nest. In less than a day they were incor- 

 porated in the community where they accomplished their larval 

 career. 



Callows of the same stock, C-d, of the same age and the same 



