62 



of them bolted and carried ofí their cocoons, whilst several 

 attacked her. She became angry and eventuall}^ killed six 

 workers. At 5.45 p.m. the female was alone with the dead and 

 injured workers. On July 9th the F. sanguínea female was 

 alone, the F. fusca workers had carried ofí all their dead, and 

 had blocked her in with sand. During the day she died, 

 probably from injuries received. 



On July 9th a winged F. sanguínea female from Woking 

 was placed in the Porlock nest, her wings having been first 

 removed. She at once rushed in among the F. fusca colony, 

 killed several F. fusca workers, and was then held by a large 

 number and soon killed. 



On July loth another F. sanguínea female from Bewdley 

 was placed in the light partition of the Porlock nest, and blocked 

 in, as DoNiSTHORPE was going away for a few days. On his 

 return, on July 13th, he found the F. fusca workers had forced 

 an entrance, the F. sanguínea female was dead, and no less than 

 fifteen dead F. fusca workers lay beside her. 



The experiment next described, which has proved to be suc- 

 cessful and is still going on, is dealt with last. On July 2nd 

 DoNiSTHORPE removed the wings from a young F. sanguínea 

 female from Woking and placed her in the light chamber of a 

 small two-chambered plaster nest. The dark chamber con- 

 tained seven F. fusca females, three F. /«sea workers, a few larvae, 

 and one cocoon. The small brood had been brought up by 

 these ants, which had been taken from a fusca colon}' at Hainsh, 

 Tiree, in April. The F. sanguínea female soon entered the dark 

 chamber, and the F. fusca females and workers ran and hid in 

 corners. At 5 o'clock all the latter had gone into the light 

 chamber, except one F. fusca female. They had removed the 

 larvie, but the F. sanguínea female had captured the one cocoon 

 which she held in her jaws. 



On July 3rd all the F. fusca workers had been killed, and 

 the F. sanguínea female again held the cocoon in her jaws. 

 The F. fusca females were all huddled together in one corner 

 with the larvae. On July 4th one of the F. fusca females had 

 been killed and the F. sanguínea female had collected the two 

 largest larvae and the cocoon. Four of the F. fusca females were 

 removed as they were required for other experiments. 



