cenchrus
From ZooTerms (Dictionary of Invertebrate Zoology)
cenchrus (noun; plural cenchri; Greek kenchros, millet): (Arthropoda: Insecta) In Hymenoptera, specialized lobes on the metanotum of certain sawflies that contact with rough areas on the underside of the fore wing to hold them in place; sometimes functioning as a stridulatory apparatus.
