I noticed that spiders were generally most intelligent in escaping,
and did not, like the cockroaches and other insects, take shelter
in the first hiding-place they found, only to be driven out again,
or perhaps caught by the advancing army of ants. I have often seen
large spiders making off many yards in advance, and apparently
determined to put a good distance between themselves and their foe.
I once saw one of the false spiders, or harvest-men (Phalangidae),
standing in the midst of an army of ants, and with the greatest
circumspection and coolness lifting, one after the other, its long
legs, which supported its body above their reach. Sometimes as many
as five out of its eight legs would be lifted at once, and whenever
an ant approached one of those on which it stood, there was always
a clear space within reach to put down another, so as to be able to
hold up the threatened one out of danger.

I was much more surprised with the behaviour of a green, leaf-like
locust. This insect stood immovably amongst a host of ants, many of
which ran over its legs, without ever discovering there was food
within their reach. So fixed was its instinctive knowledge that its
safety depended on its immovability, that it allowed me to pick it
up and replace it amongst the ants without making a single effort
to escape. This species closely resembles a green leaf, and the
other senses, which in the Ecitons appear to be more acute than
that of sight, must have been completely deceived. It might easily
have escaped from the ants by using its wings, but it would only
have fallen into as great a danger, for the numerous birds that
accompany the army ants are ever on the look out for any insect
that may fly up, and the heavy flying locusts, grasshoppers, and
cockroaches have no chance of escape. Several species of