LETTERS ON ENTOMOLOGY. 99 
their army being composed entirely of neuters. 
They do not confine themselves to the negro ants; 
for, if nearer, they sometimes attack the mining 
ants, which are much more courageous, and there- 
fore they move with closer order and rapidity. 
The miners dart upon them, fight foot to foot, and 
defend their progeny with unexampled courage. 
During these combats the pillaged ant-hill presents 
in miniature, the spectacle of a besieged city; hun- 
dreds of its inhabitants may be seen making their 
escape, and carrying off their young brood, and 
the newly excluded females, to a place of safety; 
but. when the danger is over they bring them 
back, and barricade their city, placing a strong 
guard at the entrance. — Formica sanguined is 
another of the slave-making ants. On the 15th 
of July, at ten in the morning, Huber observed a 
small band of these ants sallying forth from their 
nest and marching rapidly to a neighbouring 
nest of negroes, around which it dispersed. The 
inhabitants rushing out, attacked and took several 
prisoners ; those that escaped stopped, appearing 
to wait for succours ; small brigades kept fre- 
quently arriving, which emboldened them to ap- 
proach nearer to the city they blockaded ; upon 
this their anxiety to send home messengers 
seemed to increase; these spreading a general 
f2 
