1901.] NATURAL SCIENCES OF PHILADELPHIA. 427 



of her egg?, larvre aud pup:e; but if there be workers belonging 

 to her, she retires to a place of safety, and remains there until the 

 fracas subsides and the workers seek her out. 



"Workers from different colonies shut into the same nest will fight 

 until but one party remains. I put into a Janet nest, which one 

 colony had occupied for a week, another colony that had for two 

 weeks been in a Lubbock nest. The following day the Lubbock 

 colony was congregated with a mass of its young in three stages 

 in the food-room; the Janet colony was likewise congregated with 

 its young in the adjoining nursery, and a battle was raging between 

 groups of two, of three, of four and of five, the attacks being 

 always upon single ants. A day later eighty ants had been slain, 

 and the warfare continued. On the fifth day the young of both 

 colonies had all been brought together into the nursery and the 

 victorious remnant of the Janet colony was alone Avith its spoils. 



When a single alien Sfenamma falvum piceujn is introduced into 

 a colony, it at once exhibits signs of terror, endeavors to flee or to 

 hide, and keeps apart from the habitants; but sooner or later an 

 inmate comes upon it, and though it may slay its opponent in a 

 duel or two, it is sure to be destroyed, as no Stenamma fulvum 

 piceum code of honor intervenes against an attack of many upon 

 one. 



Long-continued isolation does not abate the hostility of Sten- 

 amma fulvum piceitm to an alien. I have tried many experiments 

 with queens that had lived solitary for several months, introducing 

 to their respective domiciles alien workers of all ages, from loag 

 mature adults to callows just beginning to walk, and I have but 

 rarely succeeded in efTecting a reconciliation between the two. 

 The hostility of the worker to the queen was usually as marked as 

 was that of the queen to the worker. The few cases in which 

 affiliation Avas induced were all between the queen and very young- 

 callows, whose impudence appears sometimes to be condoned by 

 their elders. An instance of this toleration was given by a queen 

 and one major worker that had been isolated in a Petri cell for 

 more than three months. After killing several older callows, 

 introduced one by one, they had permitted an alien minim, intro- 

 duced when but a few hours old, to remain with them. Five days- 

 later I introduced two sisters of their adopted young worker, the 

 newcomers being minims about twenty days old. These newcomer* 



