Stomotheca is the term applied to the feeding apparatus in front of the mouth of harvestmen, and sometimes the related scorpions.
Usually it consists of the epistome (labrum), two pairs of coxapophyses (endites, maxillary lobes) and often a labium.
It some species there is a narrow canal (pseudotrachea) on the posterior surface of the pedipalpal coxapophysis, possibly conducting fluids into the digestive tract.
While most harvestmen have coxapophyses on the second pair of legs as well, these do not end in pad-like structures and are reduced in many groups.
[1] The term stomotheca is derived from Ancient Greek stoma "mouth" and theca "case, box".