NEST AS PUPiE AND SUBSEQUENTLY RESTORED. 237 



Je crois du reste que c'est au moyen de perceptions 

 olfactives de contact." * 



I have, however, repeated my previous observations, 

 with the same results. 



At the beginning of August I brought in a nest of 

 Lasius niger containing a large number of pupse. 

 Some of these I placed by themselves, in charge of three 

 ants belonging to the same species, but taken from a 

 nest I have had under observation for rather more than 

 ten years. On August 28 I took twelve of the young 

 ants, which in the mean time had emerged from the sepa- 

 rated pupge, selecting some which had almost acquired 

 their full colour. Eour of them I placed in their old 

 nest, and four in that from which their nurses were taken. 



At 4.30 in their own nest none were attacked. 

 „ „ „ nurses' nest one was attacked. 



„ 5.0 „ own nest none were attacked. 

 „ „ „ nurses' nest all four were attacked. 

 „ 8.0 „ own nest none were attacked. 

 „ „ „ nurses' nest three were attacked. 



The next day I took six more and marked them 

 with a spot of paint as usual, and at 7.30 replaced 

 them in their own nest. 



At 8.0 I found 5 quite at home ; tlie others I could not see, but none 



were attacked. 



* "Forel. Exp. et Rem. crit. sur les Sensations des Insectes, 

 Becueil Zool. Suisse., 1887. 



