part_of antenna antennal scrobe SIBO:0000100 sibo A groove, impresison, or excavation in the sie of the head, which runs above or below the eye, to accomidate at least the antennal scape, but often the entire antenna, when the latter folded back. Antennal scrobes vary in development form simple broad shallow groves to extensive deep trenches. Antennal scrobes are abesent from most any genera.