\Wheat sawfly\
(a) A small European sawfly ({Cephus pygm[ae]us}) whose larva
    does great injury to wheat by boring in the stalks.
(b) Any of several small American sawflies of the genus
    {Dolerus}, as {D. sericeus} and {D. arvensis}, whose
    larv[ae] injure the stems or heads of wheat.
(c) {Pachynematus extensicornis}, whose larv[ae] feed chiefly
    on the blades of wheat; -- called also {grass sawfly}.