http://waynesword.palomar.edu/ww0403.htm
"The first Argentine ants set foot on U.S. soils in the late 1890's, as
coffee ships from Brazil unloaded their cargo in New Orleans. Being prolific
breeders and constantly on the go, they moved across the southern half of
the United States. A single colony may contain 10,000 female workers, and
there may be hundreds of colonies around your home; the total number of ants
could easily reach a million. Although they cannot sting, they can bite;
however, they are only 2-3 mm long and are too small to hurt humans. But, in
the world of insects, these ants are truly a living terror. They are very
aggressive and readily overtake other ant species, even ants that are much
larger and with powerful stings. Argentine ants are relentless and simply
outnumber their adversaries until the enemy colony is destroyed. They even
attack paper wasp nests under the eaves of a house, forcing the huge wasps
to flee their nests in terror. A "killer bee" nest probably could not
withstand an invasion of Argentine ants.
One redeeming quality about these little warriors is that they will also
attack termite colonies in the foundation of your home."
