222 
INSTINCT. 
Chap. VII. 
At tlie same time I laid on the same place a small 
parcel of the pupae of another species, F. flava, with a 
few of these little yellow ants still clinging to the frag¬ 
ments of the nest. This species is sometimes, though 
rarely, made into slaves, as has been described by Mr. 
Smith. Although so small a species, it is very cour¬ 
ageous, and I have seen it ferociously attack other ants. 
In one instance I found to my surprise an independent 
community of F. flava under a stone beneath a 
nest of the slave-making F. sanguinea; and when I 
had accidentally disturbed both nests, the little ants 
attacked their big neighbours with surprising courage. 
Now I was curious to ascertain whether F. sanguinea 
could distinguish the pupm of F. fusca, which they 
habitually make into slaves, from those of the little and 
furious F. flava, which they rarely capture, and it was 
evident that they did at once distinguish them : for we 
have seen that they eagerly and instantly seized the 
pupm of F. fusca, whereas they were much terrified 
when they came across the pup 90 , or even the earth 
from the nest of F. flava, and quickly ran away; but in 
about a quarter of an hour, shortly after all the little 
yellow ants had crawled away, they took heart and car¬ 
ried off the pupae. 
One evening I visited another community of F. san¬ 
guinea, and found a number of these ants returning home 
and entering their nests, carrying the dead bodies of F. 
fusca (showing that it was not a migration) and nume¬ 
rous pupae. I traced a long file of ants burthened with 
booty, for about forty yards, to a very thick clump of 
heath, whence I saw the last individual of F. sanguinea 
emerge, carrying a pupa; but I was not able to find the 
desolated nest in the thick heath. The nest, however, 
must have been close at hand, for two or three indi¬ 
viduals of F. fusca were rushing about in the greatest 
