24O A. M. FIELDE. 



nest, occupied by fifty of the old residents, with larvae from their 

 own eggs, several newly-hatched Cremastogaster lineolata from 

 a wild nest V. Within a day all these young Cremastogasters 

 had been killed and their bodies piled together in a corner of the 

 food-room. Others of their kind met a like fate on July 9. 



On the 24th of June, I had happily secured some larvae, with 

 workers to rear them, from the wild nest of the old H colony of 

 Cremastogasters, and on July 22, I put a dozen callows, newly 

 hatched from this stock, into the Bi nest, where the residents 

 were much engrossed with their own pupae. Two or three of 

 these introduced callows were killed and dismembered, while all 

 the rest were accepted into close companionship by the resident 

 Stenammas. The Cremastogasters were permitted to walk over 

 or rest upon the pupa-pile, they were gently licked, and none was 

 harmed during the ensuing twelve days. I then removed them 

 to prepare the nest for another experiment. 



But while the Cremastogasters were still in the Bi nest, on 

 July 25, I introduced a newly hatched Formica lasiodes, in order 

 to see whether these Stenammas would accept a callow of un- 

 known odor. This visitor was immediately killed and carried to 

 the rubbish-pile. 



Further evidence that the Cremastogasters were offspring of 

 the queen that laid the eggs from which the 63 Cremastogasters 

 issued, was obtained by putting some of them into K nest with 

 an H colony queen that had never before met any Cremastogaster 

 workers of any colony, having spent her whole life since she was 

 hatched in August, 1903, with Stenamma workers. This queen 

 and the Stenamma workers with her, all accepted the H colony 

 Cremastogaster workers hatched in the latter part of July, 1904, 

 and continued to closely affiliate with them. They were doubt- 

 less of the same odor as was the queen in this K nest, being 

 progeny of the same queen in different years, the queen in K 

 nest still retaining her queen-mother's odor, while the worker- 

 callows bore the queen-mother's ordor as yet unchanged by 

 ageing. 



Stenamma fulvnni in my artificial nests, when they had no 

 young of their own, have many times permitted Cremastogaster 

 pupae to hatch in their nest and to live there among them. But 



