decatoma

from The Century Dictionary.

• noun A genus of chalcid hymenopterous insects, of the subfamily Eurytominæ, of great extent, the species of which uniformly inhabit cynipidous galls, whether as inquilines or parasites.
• noun A genus of blister-beetles: same as Mylabris.
• noun [Used as a plural.] In Latreille's system, a section of notacanthine Diptera, corresponding to the modern family Beridæ.