63 



Jul}' 5th the two remaining F. fusca females had been attacked, 

 and one had both antennae bitten off. 



July 7th. — Both F. fusca females dead, and the F. sanguínea 

 female was sitting on the cocoon and the two larvœ. 



July 8th. — A naked pupa from the Porlock F. fusca nest 

 was introduced, and the F. sanguínea female collected it into 

 her heap. 



July 9th. — The female still sitting on her heap. Ten F. fusca 

 cocoons were introduced, and she collected them all and placed 

 them with the rest. 



July 13th. — The Tiree cocoon, which was the darkest when 

 the observer left home, was found to have produced a callow, 

 and the empty case had been carried into the next compartment. 

 The larger larva had changed into a naked pupa, and the F. 

 sanguínea female and the callow were sitting together on the 

 other cocoons, two naked pupae, and the small larva. 



July 14th. — Another empty cocoon case in the light com- 

 partment. As no second callow had hatched, the female must 

 have eaten the contents. 



On July 15th a second callow just hatched, and on the 17th 

 a third, whilst a single egg was present ! 



On July i8th a fourth callow present, and the egg had dis- 

 appeared. The female still helps to carry about the cocoons. 



By July 26th eight callows were present. 



Genus Polyei^us. 



There is not quite so much evidence about C(jlon\'-founding 

 by the other Camponotine slave-maker P. rufesccns, at any rate 

 in nature, as to the existence of incipient colonics. FoREL, in 

 1874, records a fairly young Poly er gus- fusca colons- in Switz(>r- 

 land, and Wasmann states that he found in Holland in 1887 a 

 quite young Polyergiis-fusca colony. Again in i()04 the latter 

 mentions a young Polycrgus-rufiharhis colony containing about 

 one hundred rufibayhis slaves and a third of that number of 

 small Polyergus workers which he found at Luxemburg. 



The workers and females of Polycygus ajjpear unable to feed 

 themselves, though they sometimes drink water, and cannot 

 bring up larvae and pupœ. The females, moreover, placed in 



