6o Bulletin Americati Museum of Natural History. [Vol. XXII, 



accord. Within twenty minutes most of the attacks on them by the workers 

 had subsided and by 9 p.m. they were being licked and fondled by their hosts. 

 Some fighting between the older and more recently introduced females took 

 place and increased in frequency and violence till 6 p.m. One of the females 

 died Sept. 11, another Sept. 18, and only 7 remained alive Sept. 19. During 

 this time there was more or less fighting between females but not between fe- 

 males and workers. Sept. 22, 7.30 a.m. six more females were placed in the 

 nest. These were amicably received by the workers but were attacked by 

 the old females. At 7 p.m. several couples were chasing each other around the 

 nest. By Sept. 23 the fighting had become much less frequent and violent. 

 Oct. I there were still 13 living females in the nests and this number was main- 

 tained till Nov. 30, when 11 of them and some of the incerta died because the 

 nest was permitted to dry out. The remaining two females were still living, 

 Feb. 6, 1906. All the females used in this experiment were sisters. 



The ease with which the consocians females are adopted by incerta 

 workers is in marked contrast with the refusal of consocians to receive 

 females of their own species from other colonies and the refusal of the 

 workers of either species to adopt workers of the other. 



Experiment 11. July 6, 12 m. Into a colony consisting of several hundred 

 consocians workers two dealated consocians females from another colony were 

 introduced. They were suddenly and violently seized by the workers and 

 dragged into the dark chamber, where they were enveloped by a mass of 

 workers that showed as much active interest in them as they had in house-fiies 

 introduced into the nest: they licked and bit them persistently. One of 

 the females had been killed by 4 p.m. and the other was found dead the fol- 

 lowing morning. July 9 a winged and a dealated female, together with, two 

 workers from the same colony, were introduced. The workers were at once 

 adopted but the females were soon killed. July 10 two more dealated females, 

 added to the colony at 8 p.m., were killed within an hour. July 13, three dea- 

 lated females were introduced. July 14, 6.30 a.m. two of these were found 

 dead. July 16 the remaining one was still living, at 7.30 a.m. At 1.30 p.m. 

 three more females were introduced, so that there were four altogether. July 

 18 one of these had been killed. The three females were permitted to live till 

 July 20, when all had been killed and thrown into the light chamber. Four 

 more added July 21 were killed by 8.30 a.m. and by July 23 another had been 

 dispatched, leaving only one alive. This female also died some time between 

 July 26 and Aug. i. 



Experiment 12. July 10, 4.30 p.m. Three consocians workers were placed 

 in the dark chamber of a nest containing a number of incerta workers and cocoons 

 and two consocians females that had been adopted. The intruders were fiercely 

 attacked by the incerta and ran wildly about the nest trying to escape at the 

 comers of the chamber. Again and again three or four of the incerta, that 

 seemed to be much excited by the peculiar odor of the consocians, would seize 

 a worker and pull its legs and antennae . At 5.40 p.m. the consocians workers 

 had managed to escape into the light chamber, whither they were followed by 

 a few incerta. These at once began to close the entrance to the dark chamber 

 with pellets of earth and thus prevented any further visitations. 



