(pl., aulaces), in Hymenoptera, groove on dorsal ramus of gonapophysis VIII into which fits a tongue, rhachis, from ventral ramus of gonapophysis IX (Tuxen, after E. L. Smith).

(pl., aulaces) A longitudinal groove along the dorsal length of each first valvula, into which is fitted the rhachis of the second valvulae to form the tongue-and-groove olistheter interlocking mechanism of the ovipositor stylets. [drawing