The mouth-parts in this genus are much as in Tomocerus, the maxillæ ending in a lacinia and palpus.
Each maxilla bears a slender feeler or palpus composed of five segments.
When you touch him, he draws up slowly one leg after another, or moves a palpus feebly.
In x-notata (fig. 435) the palpus is as long as the cephalothorax, and the tarsus and palpal organ small and round.