palpus

Near the root or base of the mandibles on each side is a jointed feeler, or palpus; but spiders have no antenn.

The labium in Japyx is four-lobed and bears a small two-jointed palpus.

The palpus, too, on this side was turned back to correspond to the direction of the legs nearest it.

Its true function appears to be that of an extra palpus or "feeler."

The palpus of the male (fig. 339) has large and complicated appendages at the end.