sternaulus
From ZooTerms (Dictionary of Invertebrate Zoology)
sternaulus (noun; plural -li, -lices; Greek sternon, chest; aulos, tube): (Arthropoda: Insecta) In ichneumonid Hymenoptera, a horizontal groove on the lower edge of the mesopleurum from the prepectal carina backwards, sometimes reaching the base of the middle coxa; the dividing line between the mesosternum and mesopleurum.
