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In May 1902 Wasmann discovered a rufa female under a 

 stone over a fusca nest, but separated by a partition of earthy 

 at Luxemburg. The female was evidently awaiting her oppor- 

 tunity to enter the nest. In February 1906 he f(nmd two nests 

 of fusca at Lu.xemburg, containing a rufa female ; in April, 

 in company with Schmitz, a small mixed colony of rufa and 

 fusca, containing a rufa female only; and in May of the same 

 \'ear they found another in a less advanced stage, a rufa female 

 with eggs and one hundred workers being present. Wheeler 

 in 1908 and 1909 records finding three mixed colonies of F. rufa 

 and F. fusca. One below the Turtmann Glacier was a large 

 nest of F. fusca and larvie and a single rufa female. Another 

 smaller one contained, in aeldition to one live rufa female, four 

 dead ones, cut in two. Evidently five had entered the nest, 

 but only one had been successful. The third was more advanced, 

 containing twelve fusca workers, and twent\--four rufa workers. 



DoNiSTHORPE, in 1909, actually observed a rufa female 

 making her way into a fusca nest. He was in Parkhurst Forest, 

 Isle of Wight, with Taylor, on May 15th, when man\- females 

 of F. rufa were seen, some with wings and others deälated. 

 One of the latter w^as noticed near the entrance of a F. fusca 

 nest, accosting the workers, and endeavouring to enter their 

 nest. She had several fights with some, rolling over and over 

 on the ground. She eventually beat oft' the workers and finalh' 

 entered one of the doors of the nest, and was lost to view. On 

 August 2ist DoNiSTHORPE and Taylor were again in Parkhurst 

 Forest, and having found a very small nest of F. rufa, which was 

 undoubtedly a new one, it was decided to dig it up. The nest 

 was only about 8 in. in diameter b}' 3 in. in height and 6 in. 

 deep, but built of the usual materials. It contained 150 rufa 

 workers, most of them very small, one rufa female, about eighty 

 fusca workers, and a number of cocoons. The cocoons hatched 

 later and proved to be rufa workers. 



On June loth, 191 1, in the Black Wood, at Rannoch, DoNis- 

 THORPE found a dead deälated rufa female in a fusca nest under 

 a stone. It had evidently entered the nest and had been killed 

 by the fusca workers. On June 14th, in the same locality, high 

 up on the mountain where no rufa nests occur, he observed a 

 deälated rufa female walking round a stone over a fusca nest. 



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