XXX INTRODUCTION. 
object. The jaws are elongated, en- 
larged at their extrémity, slightly concave 
underneath, of a horny substance, and, 
compared to the mandibles, extremely 
slender and weak. In the centre, exter- 
nally, we notice palpi of six rings each, 
and two more may be also perceived at 
the base of the tongue; the latter are 
much smaller and composed only of four 
rings: we are as vet unacquainted with 
their use. 
The antenne, as we have before stated, 
are bent or fractured, situated in the fore- 
part of the head, more or less near the 
middle of the forehead ; they lie in a small 
longitudinal furrow, and are composed of 
twelve or thirteen joints ; the first beimg 
about half their length. The antenne 
of those ants that have a scale upon the 
fillet of the abdomen are filiform, and are 
composed of rings of the same size, or 
terminate slightly ina point. The ants 
of the second family have the antenne, 
on the contrary, enlarged at the extre- 
mity; those of the males are setaceous 
